Ћир 
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FFH scientific research papers database
FFH database search (1991-2022):
1481.
Rašković, M; Holclajtner-Antunović, I; Tripković, M; Marković, D
Excitation and analytical characteristics of an ethanol loaded U-shaped arc Journal Article
In: Journal of the Serbian Chemical Society, vol. 68, no. 2, pp. 109-118, 2003.
@article{Rašković2003109,
title = {Excitation and analytical characteristics of an ethanol loaded U-shaped arc},
author = {M Rašković and I Holclajtner-Antunović and M Tripković and D Marković},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0037250339&doi=10.2298%2fJSC0302109R&partnerID=40&md5=13f981051a693e9f9f3ace46d64ce0ca},
doi = {10.2298/JSC0302109R},
year = {2003},
date = {2003-01-01},
journal = {Journal of the Serbian Chemical Society},
volume = {68},
number = {2},
pages = {109-118},
abstract = {The effect of the ethanol load on the discharge and analytical parameters of an argon stabilised U-shaped DC arc has been recorded. Measurements of the radial distribution of the apparent temperatures and the electron number density of the DC plasma showed that ethanol addition causes a decrease in both plasma parameters. The changes in the plasma characteristics, as well as in transport and atomisation processes of the analyte cause a general change in the spectral line intensities, which depends on the physical characteristics of the analyte and the quantity of ethanol loaded into the plasma. Improved detection limits were obtained for V and Mn when a 10 % (v/v) water-ethanol solution was nebulized into the plasma.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The effect of the ethanol load on the discharge and analytical parameters of an argon stabilised U-shaped DC arc has been recorded. Measurements of the radial distribution of the apparent temperatures and the electron number density of the DC plasma showed that ethanol addition causes a decrease in both plasma parameters. The changes in the plasma characteristics, as well as in transport and atomisation processes of the analyte cause a general change in the spectral line intensities, which depends on the physical characteristics of the analyte and the quantity of ethanol loaded into the plasma. Improved detection limits were obtained for V and Mn when a 10 % (v/v) water-ethanol solution was nebulized into the plasma.
1482.
Rakić, V; Dondur, V; Hercigonja, R
FTIR study of carbon monoxide adsorption on ion-exchanged X, Y and mordenite type zeolites Journal Article
In: Journal of the Serbian Chemical Society, vol. 68, no. 4-5, pp. 409-416, 2003.
@article{Rakić2003409,
title = {FTIR study of carbon monoxide adsorption on ion-exchanged X, Y and mordenite type zeolites},
author = {V Rakić and V Dondur and R Hercigonja},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0037835574&doi=10.2298%2fJSC0305409R&partnerID=40&md5=05cc510d5671335cb7c34d0142404516},
doi = {10.2298/JSC0305409R},
year = {2003},
date = {2003-01-01},
journal = {Journal of the Serbian Chemical Society},
volume = {68},
number = {4-5},
pages = {409-416},
abstract = {In this work Fourier transform infrared (FTIR) study has been applied to study the adsorption of carbon monoxide on transition metal (Mn+, Co2+, Ni2+) ion-exchanged zeolites type Y, X and mordenites. The adsorption of CO at room temperature produces overlapping IR absorption bands in the 2120-2200 cm-1 region. The frequency of the band around 2200 cm-1 is found to be dependent not only on the charge-balancing transition metal cation, but also on the framework composition. The frequencies of the band near 1600 cm-1 was found to be dependent on the Si/Al ratio of the investigated zeolites.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
In this work Fourier transform infrared (FTIR) study has been applied to study the adsorption of carbon monoxide on transition metal (Mn+, Co2+, Ni2+) ion-exchanged zeolites type Y, X and mordenites. The adsorption of CO at room temperature produces overlapping IR absorption bands in the 2120-2200 cm-1 region. The frequency of the band around 2200 cm-1 is found to be dependent not only on the charge-balancing transition metal cation, but also on the framework composition. The frequencies of the band near 1600 cm-1 was found to be dependent on the Si/Al ratio of the investigated zeolites.
1483.
Vojinović, V; Mentus, S; Komnenić, V
Thermodynamic and kinetic behavior of hydrogen electrode in a solution of 0.5 M KClO4 in dimethyl sulphoxide Journal Article
In: Journal of the Serbian Chemical Society, vol. 68, no. 6, pp. 497-504, 2003.
@article{Vojinović2003497,
title = {Thermodynamic and kinetic behavior of hydrogen electrode in a solution of 0.5 M KClO4 in dimethyl sulphoxide},
author = {V Vojinović and S Mentus and V Komnenić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0043267598&doi=10.2298%2fJSC0306497V&partnerID=40&md5=eaa89ccec2a80b2652f9bc12e094b55b},
doi = {10.2298/JSC0306497V},
year = {2003},
date = {2003-01-01},
journal = {Journal of the Serbian Chemical Society},
volume = {68},
number = {6},
pages = {497-504},
abstract = {The hydrogen electrode on an interface platinum/dimethyl sulphoxide + 0.5 M KClO4 solution was examined from both the thermodynamic and kinetic aspect, using HCl as a proton source. The equilibrium potential was shown to obey a Nemstian dependence on concentration. The voltammograms recorded using a rotating platinum disc electrode evidenced that the cathodic evolution of hydrogen proceeds under mixed, activation-diffusion control. The diffusion coefficient of the proton was determined to amount to 4.5×10-6 cm2 s-1. In the region of activation control, a Tafel slope of about 0.110 V dec-1 was estimated, which indicates that the Volmer reaction is the rate detemaining step.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The hydrogen electrode on an interface platinum/dimethyl sulphoxide + 0.5 M KClO4 solution was examined from both the thermodynamic and kinetic aspect, using HCl as a proton source. The equilibrium potential was shown to obey a Nemstian dependence on concentration. The voltammograms recorded using a rotating platinum disc electrode evidenced that the cathodic evolution of hydrogen proceeds under mixed, activation-diffusion control. The diffusion coefficient of the proton was determined to amount to 4.5×10-6 cm2 s-1. In the region of activation control, a Tafel slope of about 0.110 V dec-1 was estimated, which indicates that the Volmer reaction is the rate detemaining step.
1484.
Rackić, V M; Dondur, V T; Hercigonja, R V; Andrić, V
The investigation of strong active sites of dealuminated Y-type zeolite by TPD of carbon monoxide Journal Article
In: Journal of Thermal Analysis and Calorimetry, vol. 72, no. 3, pp. 761-767, 2003.
@article{Rackić2003761,
title = {The investigation of strong active sites of dealuminated Y-type zeolite by TPD of carbon monoxide},
author = {V M Rackić and V T Dondur and R V Hercigonja and V Andrić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0042698815&doi=10.1023%2fA%3a1025049727731&partnerID=40&md5=f817d34cc6d778dcdce8046d2d1ca827},
doi = {10.1023/A:1025049727731},
year = {2003},
date = {2003-01-01},
journal = {Journal of Thermal Analysis and Calorimetry},
volume = {72},
number = {3},
pages = {761-767},
abstract = {The active sites of hydrogen-exchanged Y zeolite (HY) and dealuminated (HDY) zeolites are investigated by TPD of carbon monoxide. Only the high temperature TPD spectra of CO (T M ≈620-690°C) were observed, meaning that CO molecules interact with very strong acid sites. The amounts of CO bonded on these sites are small (less than 1 molecule per unit cell), The strong influence of dealumination on the coverage degree is found. The calculated values for kinetic parameters indicate chemisorption of CO in the investigated systems (E des ≈240 kJ mol -1 , A≈10 11 s -1 ).},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The active sites of hydrogen-exchanged Y zeolite (HY) and dealuminated (HDY) zeolites are investigated by TPD of carbon monoxide. Only the high temperature TPD spectra of CO (T M ≈620-690°C) were observed, meaning that CO molecules interact with very strong acid sites. The amounts of CO bonded on these sites are small (less than 1 molecule per unit cell), The strong influence of dealumination on the coverage degree is found. The calculated values for kinetic parameters indicate chemisorption of CO in the investigated systems (E des ≈240 kJ mol -1 , A≈10 11 s -1 ).
1485.
Mihajlović, R P; Ignjatović, N R; Todorović, M R; Hoclajtner-Antunović, I; Kaljević, V M
Spectrophotometric determination of phosphorus in coal and coal ash using bismuth-phosphomolybdate complex Journal Article
In: Journal of the Serbian Chemical Society, vol. 68, no. 1, pp. 65-73, 2003.
@article{Mihajlović200365,
title = {Spectrophotometric determination of phosphorus in coal and coal ash using bismuth-phosphomolybdate complex},
author = {R P Mihajlović and N R Ignjatović and M R Todorović and I Hoclajtner-Antunović and V M Kaljević},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0037283389&doi=10.2298%2fJSC0301065M&partnerID=40&md5=28de9967f945fc96fc82754f2431228f},
doi = {10.2298/JSC0301065M},
year = {2003},
date = {2003-01-01},
journal = {Journal of the Serbian Chemical Society},
volume = {68},
number = {1},
pages = {65-73},
abstract = {A modified spectrophotometric method using the bismuth phosphomolybdate complex for the determination of phosphorus in coal and coal ash is suggested. Bismuth together with phosphate and molybdate forms a very stable complex in acid medium which turns blue ("molibdenum blue") by reduction with ascorbic acid. The apparent molar absorptivity of PBiMo is 1.66×104 dm3 mol-1cm-1 at 720 nm and 2.10×104 dm3 mol-1cm-1 at 670 nm isobutyl methyl ketone (MIBK). Interference caused by the ions present are within the tolerance limits (±2%). Beer's law is obeyed in the for concentration range to 0.6 μg/mL (aqueous solution) and to 1.2 μg/mL P (MIBK). The sesitivity of the proposed method is 0.0078 μg/mL (aqueous solution) and 0.0066 μg/mL (MIBK).},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
A modified spectrophotometric method using the bismuth phosphomolybdate complex for the determination of phosphorus in coal and coal ash is suggested. Bismuth together with phosphate and molybdate forms a very stable complex in acid medium which turns blue ("molibdenum blue") by reduction with ascorbic acid. The apparent molar absorptivity of PBiMo is 1.66×104 dm3 mol-1cm-1 at 720 nm and 2.10×104 dm3 mol-1cm-1 at 670 nm isobutyl methyl ketone (MIBK). Interference caused by the ions present are within the tolerance limits (±2%). Beer's law is obeyed in the for concentration range to 0.6 μg/mL (aqueous solution) and to 1.2 μg/mL P (MIBK). The sesitivity of the proposed method is 0.0078 μg/mL (aqueous solution) and 0.0066 μg/mL (MIBK).
1486.
Simonović, B R; Mentus, S V; Dimitrijević, R
Kinetic and structural aspects of tantalum hydride formation Journal Article
In: Journal of the Serbian Chemical Society, vol. 68, no. 8-9, pp. 657-663, 2003.
@article{Simonović2003657,
title = {Kinetic and structural aspects of tantalum hydride formation},
author = {B R Simonović and S V Mentus and R Dimitrijević},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-1442324582&doi=10.2298%2fJSC0309657S&partnerID=40&md5=5e2fdd48e0ae0688f77dd0e7b878c9df},
doi = {10.2298/JSC0309657S},
year = {2003},
date = {2003-01-01},
journal = {Journal of the Serbian Chemical Society},
volume = {68},
number = {8-9},
pages = {657-663},
abstract = {Tantalum hydrides of various composition were synthesized by equilibrating tantalum with hydrogen at six different temperatures from 573 to 823 K, under a constant hydrogen pressure of 1 bar. Both the exact Ta/H mole ratios and the kinetic parameters of hydriding were determined on the basis of the dependence of the H/Ta mole ratio on time. The influence of stoichiometry on the appearance of X-ray powder diffractograms at room temperature was studied. As a consequence of hydriding, for ratios H/Ta > 0.2, the original bcc Ta-lattice undergoes distortion, manifesting itself as both a shift and a splitting of the X-ray patterns in the X-ray diffractograms. For samples with H/Ta < 0.2, the appearance of some superstructure reflections at low Bragg angles was noted, which suggests a long range ordering of hydrogen with orthorhombic symmetry.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Tantalum hydrides of various composition were synthesized by equilibrating tantalum with hydrogen at six different temperatures from 573 to 823 K, under a constant hydrogen pressure of 1 bar. Both the exact Ta/H mole ratios and the kinetic parameters of hydriding were determined on the basis of the dependence of the H/Ta mole ratio on time. The influence of stoichiometry on the appearance of X-ray powder diffractograms at room temperature was studied. As a consequence of hydriding, for ratios H/Ta > 0.2, the original bcc Ta-lattice undergoes distortion, manifesting itself as both a shift and a splitting of the X-ray patterns in the X-ray diffractograms. For samples with H/Ta < 0.2, the appearance of some superstructure reflections at low Bragg angles was noted, which suggests a long range ordering of hydrogen with orthorhombic symmetry.
1487.
Stojić, D. Lj.; Miljanić, Š S; Jakšić, M M
Electrochemical H/D Isotope Separation Efficiency Along A Hypo-Hyper-d-Electronic (Ti-Ni) Phase Diagram Journal Article
In: Journal of New Materials for Electrochemical Systems, vol. 6, no. 1, pp. 55-60, 2003.
@article{Stojić200355,
title = {Electrochemical H/D Isotope Separation Efficiency Along A Hypo-Hyper-d-Electronic (Ti-Ni) Phase Diagram},
author = {D.Lj. Stojić and Š S Miljanić and M M Jakšić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-2342558524&partnerID=40&md5=6014a61152a146f684ceb4df623bd44e},
year = {2003},
date = {2003-01-01},
journal = {Journal of New Materials for Electrochemical Systems},
volume = {6},
number = {1},
pages = {55-60},
abstract = {Intermetallic phases (stable and meta-stable) along the Ti-Ni phase diagram, together with the pure constituents (Ti, Ni), have been investigated as cathode materials for separation of hydrogen isotopes (protium and deuterium, H/D) by water electrolysis from alkaline solutions. The H/D separation factors, obtained using these electrodes, were compared with their hydridic and electrocatalytic features significant for the hydrogen evolution reaction (HER), the enthalpies of intermetallic formation, and their electronic work function. As with the similar behavior of transition elements along the Periodic Table, close correlations were found amongst them. The Ti-Ni intermetallic phases obey typical volcanic plots for all the mutually compared properties along their phase diagram. The TiNi 3 alloy with an average d 8 - electronic configuration has maximal electrocatalytic activity for both hydrogen evolution and H/D electrochemical separation processes, the highest value of electronic work function, as well as maximal enthalpy of formation. Intermetallic phases Ti 2 Ni and TiNi, with an average electronic configuration between d 4 and d 5 , exhibit lower values on each of these specific curves. The similarity between the mentioned features suggests that the average electronic configuration of these intermetallic phases determine overall electrode process kinetics, isotope separation efficiency, bond strength, electronic work function, and other physical and chemical properties.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Intermetallic phases (stable and meta-stable) along the Ti-Ni phase diagram, together with the pure constituents (Ti, Ni), have been investigated as cathode materials for separation of hydrogen isotopes (protium and deuterium, H/D) by water electrolysis from alkaline solutions. The H/D separation factors, obtained using these electrodes, were compared with their hydridic and electrocatalytic features significant for the hydrogen evolution reaction (HER), the enthalpies of intermetallic formation, and their electronic work function. As with the similar behavior of transition elements along the Periodic Table, close correlations were found amongst them. The Ti-Ni intermetallic phases obey typical volcanic plots for all the mutually compared properties along their phase diagram. The TiNi 3 alloy with an average d 8 - electronic configuration has maximal electrocatalytic activity for both hydrogen evolution and H/D electrochemical separation processes, the highest value of electronic work function, as well as maximal enthalpy of formation. Intermetallic phases Ti 2 Ni and TiNi, with an average electronic configuration between d 4 and d 5 , exhibit lower values on each of these specific curves. The similarity between the mentioned features suggests that the average electronic configuration of these intermetallic phases determine overall electrode process kinetics, isotope separation efficiency, bond strength, electronic work function, and other physical and chemical properties.
1488.
Marković, R; Shirazi, A; Džambaski, Z; Baranac, M; Minić, D
Hydrogen bonding in push-pull 5-substituted-2-alkylidene-4-oxothiazolidines: 1H-NMR spectroscopic study Journal Article
In: Journal of the Serbian Chemical Society, vol. 68, no. 1, pp. 1-7, 2003.
@article{Marković20031c,
title = {Hydrogen bonding in push-pull 5-substituted-2-alkylidene-4-oxothiazolidines: 1H-NMR spectroscopic study},
author = {R Marković and A Shirazi and Z Džambaski and M Baranac and D Minić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0037286126&doi=10.2298%2fJSC0301001M&partnerID=40&md5=9bb0e1581b049352221219407db96ca0},
doi = {10.2298/JSC0301001M},
year = {2003},
date = {2003-01-01},
journal = {Journal of the Serbian Chemical Society},
volume = {68},
number = {1},
pages = {1-7},
abstract = {Application of dynamic 1H-NMR spectroscopy added to the understanding of the hydrogen bonds existing in the structurally related 5-substituted-2-alkylidene-4-oxothiazolidines in polar and apolar solvents. The equilibrated mixtures of these typical push-pull alkenes in CDCl3 consist of the intramolecularly H-bonded (E)-isomer and intermolecularly H-bonded (Z)-isomer in varying proportions which depend on the solvent polarity. For the representative of the series. (Z)-2-(5-ethoxycarbonylmethyl-4-oxothiazolidin-2-ylidene)-1-phenylethanone, a concentration effect on the degree of intermolecular hydrogen bonding in apolar CDCl3 has been studied.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Application of dynamic 1H-NMR spectroscopy added to the understanding of the hydrogen bonds existing in the structurally related 5-substituted-2-alkylidene-4-oxothiazolidines in polar and apolar solvents. The equilibrated mixtures of these typical push-pull alkenes in CDCl3 consist of the intramolecularly H-bonded (E)-isomer and intermolecularly H-bonded (Z)-isomer in varying proportions which depend on the solvent polarity. For the representative of the series. (Z)-2-(5-ethoxycarbonylmethyl-4-oxothiazolidin-2-ylidene)-1-phenylethanone, a concentration effect on the degree of intermolecular hydrogen bonding in apolar CDCl3 has been studied.
1489.
Micic, M; Leblanc, R M; Markovic, D; Stamatovic, A; Vukelic, N; Polic, P
Atlas of the tropospheric aerosols from Belgrade troposphere Journal Article
In: Fresenius Environmental Bulletin, vol. 12, no. 9, pp. 1015-1024, 2003.
@article{Micic20031015,
title = {Atlas of the tropospheric aerosols from Belgrade troposphere},
author = {M Micic and R M Leblanc and D Markovic and A Stamatovic and N Vukelic and P Polic},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0142092493&partnerID=40&md5=52d0e1aab41155bc632ce90e4b2a8917},
year = {2003},
date = {2003-01-01},
journal = {Fresenius Environmental Bulletin},
volume = {12},
number = {9},
pages = {1015-1024},
abstract = {This SEM/ESEM (environmental scanning electron microscope) study provides inventory/ particulate atlas of the atmospheric aerosols collected from the lower troposphere of the Belgrade (Yugoslavia) suburb as a model system for the particulate matter from urban environment in Balkan peninsula. Most significant aerosol fractions observed in Belgrade troposphere are carbonaceous soot particles and coal ash particulates. Carbonaceous soot are equally represented by fine soot originating from internal combustion engines and that of local coal power plants, which are, together with associated ash deposits, the main contributor to the particulate pollution in the Belgrade region.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
This SEM/ESEM (environmental scanning electron microscope) study provides inventory/ particulate atlas of the atmospheric aerosols collected from the lower troposphere of the Belgrade (Yugoslavia) suburb as a model system for the particulate matter from urban environment in Balkan peninsula. Most significant aerosol fractions observed in Belgrade troposphere are carbonaceous soot particles and coal ash particulates. Carbonaceous soot are equally represented by fine soot originating from internal combustion engines and that of local coal power plants, which are, together with associated ash deposits, the main contributor to the particulate pollution in the Belgrade region.
1490.
Mioč, U B; Todorović, M R; Uskoković-Marković, S M; Davidović, M; Kremenović, A; Bire, A Spasojević-De; Čajkovski, T; Likar-Smiljanić, V; Biljić, R
Structure and proton conductivity in a magnesium salt of 12-tungstophosphoric acid Journal Article
In: Solid State Ionics, vol. 162-163, pp. 217-223, 2003.
@article{Mioč2003217,
title = {Structure and proton conductivity in a magnesium salt of 12-tungstophosphoric acid},
author = {U B Mioč and M R Todorović and S M Uskoković-Marković and M Davidović and A Kremenović and A Spasojević-De Bire and T Čajkovski and V Likar-Smiljanić and R Biljić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0141620278&doi=10.1016%2fS0167-2738%2803%2900257-1&partnerID=40&md5=ab85b53b03274ea858da8666155c3c9d},
doi = {10.1016/S0167-2738(03)00257-1},
year = {2003},
date = {2003-01-01},
journal = {Solid State Ionics},
volume = {162-163},
pages = {217-223},
abstract = {Some structural properties of a magnesium salt of 12-tungstophosphoric acid, MgHPW 12 O 40 ·nH 2 O (MgHWPA-n), are reported. The influence of the Mg 2+ ion on the structure, dynamics of the protonic species, and dielectric and conductive characteristics of the salt have been studied. The interaction of protonic species with Keggin anion was discussed. Preliminary results of the crystal structure indicate that the structure is composed of Keggin anions and Mg(OH 2 ) 6 aqua-complexes. Some comparisons are made with other alkaline-earth and alkaline salts of WPA. The results of thermal analysis (TGA and DTA), X-ray diffraction (XRD), scanning electron microscopy (SEM), infrared spectroscopy (IR), conductivity and permittivity measurements of MgHWPA-n are reported and discussed. © 2003 Elsevier B.V. All rights reserved.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Some structural properties of a magnesium salt of 12-tungstophosphoric acid, MgHPW 12 O 40 ·nH 2 O (MgHWPA-n), are reported. The influence of the Mg 2+ ion on the structure, dynamics of the protonic species, and dielectric and conductive characteristics of the salt have been studied. The interaction of protonic species with Keggin anion was discussed. Preliminary results of the crystal structure indicate that the structure is composed of Keggin anions and Mg(OH 2 ) 6 aqua-complexes. Some comparisons are made with other alkaline-earth and alkaline salts of WPA. The results of thermal analysis (TGA and DTA), X-ray diffraction (XRD), scanning electron microscopy (SEM), infrared spectroscopy (IR), conductivity and permittivity measurements of MgHWPA-n are reported and discussed. © 2003 Elsevier B.V. All rights reserved.
1491.
Čajkovski, T; Davidović, M; Pissis, P; Polizos, G; Čajkovski, D; Likar-Smiljanić, V; Biljić, R; Nedić, Z; Mioč, U B
Dielectric investigation of electrical conductivity in the copper salt of the 12-tungstophosphoric acid hydrate Journal Article
In: Solid State Ionics, vol. 162-163, pp. 203-208, 2003.
@article{Čajkovski2003203,
title = {Dielectric investigation of electrical conductivity in the copper salt of the 12-tungstophosphoric acid hydrate},
author = {T Čajkovski and M Davidović and P Pissis and G Polizos and D Čajkovski and V Likar-Smiljanić and R Biljić and Z Nedić and U B Mioč},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0141620280&doi=10.1016%2fS0167-2738%2803%2900233-9&partnerID=40&md5=c2257689c95e0bb5d441a60fe8299831},
doi = {10.1016/S0167-2738(03)00233-9},
year = {2003},
date = {2003-01-01},
journal = {Solid State Ionics},
volume = {162-163},
pages = {203-208},
abstract = {The electrical and dielectric properties of the copper salt of 12-tungstophosphoric acid (WPA) hydrate have been investigated by broadband dielectric relaxation spectroscopy (DRS). This work is a continuation of our previous investigations on the influence of monovalent and bivalent cations on the dielectric properties of WPA hydrates salts. Measurements were made in the frequency range 10 mHz-1 MHz in order to explore the long-range dynamics, following recent microwave measurements aiming at the local dynamics properties. Experiments were done in the temperature interval 293-350 K. Data treatment included complex permittivity ε*, complex electric modulus M* and complex impedance Z* formalism, Arrhenius diagram and Cole-Cole diagrams. The results are discussed in terms of conductivity relaxation and conductivity current relaxation. Rather long conductivity relaxation times measured seem to correspond to ion jumping processes. A phase transition was observed at 323 K. © 2003 Elsevier B.V. All rights reserved.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The electrical and dielectric properties of the copper salt of 12-tungstophosphoric acid (WPA) hydrate have been investigated by broadband dielectric relaxation spectroscopy (DRS). This work is a continuation of our previous investigations on the influence of monovalent and bivalent cations on the dielectric properties of WPA hydrates salts. Measurements were made in the frequency range 10 mHz-1 MHz in order to explore the long-range dynamics, following recent microwave measurements aiming at the local dynamics properties. Experiments were done in the temperature interval 293-350 K. Data treatment included complex permittivity ε*, complex electric modulus M* and complex impedance Z* formalism, Arrhenius diagram and Cole-Cole diagrams. The results are discussed in terms of conductivity relaxation and conductivity current relaxation. Rather long conductivity relaxation times measured seem to correspond to ion jumping processes. A phase transition was observed at 323 K. © 2003 Elsevier B.V. All rights reserved.
1492.
Ciric-Marjanovic, G; Cvjetićanin, N; Mentus, S; Budinski-Simendić, J; Krakovsky, I
Electrochemical polymerization of 2-methyl-1-naphthylamine Journal Article
In: Polymer Bulletin, vol. 50, no. 5-6, pp. 319-326, 2003.
@article{Ciric-Marjanovic2003319,
title = {Electrochemical polymerization of 2-methyl-1-naphthylamine},
author = {G Ciric-Marjanovic and N Cvjetićanin and S Mentus and J Budinski-Simendić and I Krakovsky},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0041767576&doi=10.1007%2fs00289-003-0174-8&partnerID=40&md5=599248f285679da6f416ef214e5a73af},
doi = {10.1007/s00289-003-0174-8},
year = {2003},
date = {2003-01-01},
journal = {Polymer Bulletin},
volume = {50},
number = {5-6},
pages = {319-326},
abstract = {2-methyl-1-naphthylamine has been electropolymerized from the acidic aqueous solutions by three different synthetic routes. The polymerization products, deposited at a platinum working electrode as very adherent films, were characterized by cyclic voltammetry (CV), infrared spectroscopy (IR) and gel permeation chromatography (GPC). In a strongly acidic medium, the products display redox properties, in a form of two well-defined redox pairs with the formal potentials at 0.19 V and 0.47 V vs. SCE. IR-spectroscopy indicated that the polymerization occurs via the -NH2 groups, by different coupling ways: N-C(4), N-C(5) and N-C(7), as well as that ClO4- ions incorporate themselves into the product of electropolymerization. GPC of the polymerization products evidenced oligomeric chains with molar masses up to 1600 g/mol as main species.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
2-methyl-1-naphthylamine has been electropolymerized from the acidic aqueous solutions by three different synthetic routes. The polymerization products, deposited at a platinum working electrode as very adherent films, were characterized by cyclic voltammetry (CV), infrared spectroscopy (IR) and gel permeation chromatography (GPC). In a strongly acidic medium, the products display redox properties, in a form of two well-defined redox pairs with the formal potentials at 0.19 V and 0.47 V vs. SCE. IR-spectroscopy indicated that the polymerization occurs via the -NH2 groups, by different coupling ways: N-C(4), N-C(5) and N-C(7), as well as that ClO4- ions incorporate themselves into the product of electropolymerization. GPC of the polymerization products evidenced oligomeric chains with molar masses up to 1600 g/mol as main species.
1493.
Micic, M; Orbulescu, J; Radotic, K; Jeremic, M; Sui, G; Zheng, Y; Leblanc, R M
ZL-DHP lignin model compound at the air-water interface Journal Article
In: Biophysical Chemistry, vol. 99, no. 1, pp. 55-62, 2002.
@article{Micic200255,
title = {ZL-DHP lignin model compound at the air-water interface},
author = {M Micic and J Orbulescu and K Radotic and M Jeremic and G Sui and Y Zheng and R M Leblanc},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0037015323&doi=10.1016%2fS0301-4622%2802%2900121-7&partnerID=40&md5=25d4054147ce8a8c261c65a81ec53f75},
doi = {10.1016/S0301-4622(02)00121-7},
year = {2002},
date = {2002-01-01},
journal = {Biophysical Chemistry},
volume = {99},
number = {1},
pages = {55-62},
abstract = {In this paper we present our surface chemistry studies of enzymatically polymerized, poly-coniferyl alcohol lignin model compound (dehydrogenate polymer a.k.a. ZL-DHP) at the air-water interface. Using the CHCl3/MeOH (5:1 v/v) spreading solvent, we found an average molecular area of ZL-DHP of approximately 1200 Å2. The monolayer expresses a high compressibility with a collapsed area of 500 Å2 and collapsed surface pressure of 28 mN m-1. In the range of applied surface pressures, ZL-DHP polymer have no phase changes, as shown by the very high linearity (R=0.994) of absorbance vs. surface pressure cure. There was no symmetry transitions observed as shown by absence of shifts of absorption peak maximums. © 2002 Elsevier Science B.V. All rights reserved.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
In this paper we present our surface chemistry studies of enzymatically polymerized, poly-coniferyl alcohol lignin model compound (dehydrogenate polymer a.k.a. ZL-DHP) at the air-water interface. Using the CHCl3/MeOH (5:1 v/v) spreading solvent, we found an average molecular area of ZL-DHP of approximately 1200 Å2. The monolayer expresses a high compressibility with a collapsed area of 500 Å2 and collapsed surface pressure of 28 mN m-1. In the range of applied surface pressures, ZL-DHP polymer have no phase changes, as shown by the very high linearity (R=0.994) of absorbance vs. surface pressure cure. There was no symmetry transitions observed as shown by absence of shifts of absorption peak maximums. © 2002 Elsevier Science B.V. All rights reserved.
1494.
Ciric-Marjanovic, G; Marjanović, B; Stamenković, V; Vitnik, Ž; Antić, V; Juranić, I
Structure and stereochemistry of electrochemically synthesized poly-(1-naphthylamine) from neutral acetonitrile solution Journal Article
In: Journal of the Serbian Chemical Society, vol. 67, no. 12, pp. 867-877, 2002.
@article{Ciric-Marjanovic2002867,
title = {Structure and stereochemistry of electrochemically synthesized poly-(1-naphthylamine) from neutral acetonitrile solution},
author = {G Ciric-Marjanovic and B Marjanović and V Stamenković and Ž Vitnik and V Antić and I Juranić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0036984346&doi=10.2298%2fJSC0212867C&partnerID=40&md5=a9d7eb1879dac41da4db504851ba7977},
doi = {10.2298/JSC0212867C},
year = {2002},
date = {2002-01-01},
journal = {Journal of the Serbian Chemical Society},
volume = {67},
number = {12},
pages = {867-877},
abstract = {Poly-(1-naphthylamine) films were synthesized potentiodinamically and potentiostatically from 1-naphthylamine in neutral acetonitrile medium using a platinum electrode. These polymer films were investigated by infrared spectroscopy. Contrary to earlier published results neglecting the stereochemistry of the poly-(1-naphthylamine), we predict on the basis of quantum stereochemical analysis of the possible structural subunits of the polymer, that the ordinary N-C(4) coupled product is not predominant in the polymer because it is far removed from the expected planarity. Based on the results of IR investigations and semiempirical quantum chemical calculations, it is proposed that the polymer products are formed via mixed N-C(4), N-C(5) and N-C(7) coupling routes. The heats of formation of the oxidized 1-naphthylamine dimers and hexamers were calculated.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Poly-(1-naphthylamine) films were synthesized potentiodinamically and potentiostatically from 1-naphthylamine in neutral acetonitrile medium using a platinum electrode. These polymer films were investigated by infrared spectroscopy. Contrary to earlier published results neglecting the stereochemistry of the poly-(1-naphthylamine), we predict on the basis of quantum stereochemical analysis of the possible structural subunits of the polymer, that the ordinary N-C(4) coupled product is not predominant in the polymer because it is far removed from the expected planarity. Based on the results of IR investigations and semiempirical quantum chemical calculations, it is proposed that the polymer products are formed via mixed N-C(4), N-C(5) and N-C(7) coupling routes. The heats of formation of the oxidized 1-naphthylamine dimers and hexamers were calculated.
1495.
Trifunović, S R; Marković, Z; Sladić, D; Andjelković, K; Saboc, T; Minić, D
In: Journal of the Serbian Chemical Society, vol. 67, no. 2, pp. 115-122, 2002.
@article{Trifunović2002115,
title = {The synthesis and characterization of nickel(II) and copper(II) complexes with the polydentate dialkyl dithiocarbamic acid ligand 3-dithiocarboxy-3-aza-5-aminopentanoate},
author = {S R Trifunović and Z Marković and D Sladić and K Andjelković and T Saboc and D Minić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0036003609&doi=10.2298%2fJSC0202115T&partnerID=40&md5=23859e875b4fefdba7bac7868bbc3c1b},
doi = {10.2298/JSC0202115T},
year = {2002},
date = {2002-01-01},
journal = {Journal of the Serbian Chemical Society},
volume = {67},
number = {2},
pages = {115-122},
abstract = {Square planar complexes of Ni(II) and Cu(II) with potassium 3-dithiocarboxy-3-aza-5-aminopentanoate have been prepared by direct synthesis. The obtained neutral complexes were characterized by elemental analysis, magnetic susceptibility measurements, infrared and electronic spectra. The thermal behaviour of both the Ni(II) and Cu(II) complexes, and the ligand itself was investigated by DSC and TG.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Square planar complexes of Ni(II) and Cu(II) with potassium 3-dithiocarboxy-3-aza-5-aminopentanoate have been prepared by direct synthesis. The obtained neutral complexes were characterized by elemental analysis, magnetic susceptibility measurements, infrared and electronic spectra. The thermal behaviour of both the Ni(II) and Cu(II) complexes, and the ligand itself was investigated by DSC and TG.
1496.
Kremenovi, A; Biré, A Spasojevi-de; Bourée, F; Colomban, P; Dimitrijevi, R; Davidovi, M; Mioč, U B
In: Solid State Ionics, vol. 150, no. 3-4, pp. 431-442, 2002.
@article{Kremenovi2002431,
title = {Structural modifications of dodecatungstophosphoric acid hexahydrate induced by temperature in the 10-358 K range. In situ high-resolution neutron powder diffraction investigation},
author = {A Kremenovi and A Spasojevi-de Biré and F Bourée and P Colomban and R Dimitrijevi and M Davidovi and U B Mioč},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0036781232&doi=10.1016%2fS0167-2738%2802%2900419-8&partnerID=40&md5=d7523d981d31258cf71c2a9458fbada9},
doi = {10.1016/S0167-2738(02)00419-8},
year = {2002},
date = {2002-01-01},
journal = {Solid State Ionics},
volume = {150},
number = {3-4},
pages = {431-442},
abstract = {Dodecatungstophosphoric acid hexahydrate H 3 PW 12 O 40 ·6H 2 O crystal structure has been investigated by neutron powder diffraction (NPD) at different temperatures in the 10-358 K range. A nonconvergent reversible phase transition has been noticed at about 320 K. This transition is associated with a change in dynamic equilibrium of hydrate species and partial reduction/oxidation (redox) W 6+ ↔ W 5+ . Expressive structure changes lie in the P-O bonding inside Keggin's anion and the H 5 O 2 + conformational angle. © 2002 Published by Elsevier Science B.V.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Dodecatungstophosphoric acid hexahydrate H 3 PW 12 O 40 ·6H 2 O crystal structure has been investigated by neutron powder diffraction (NPD) at different temperatures in the 10-358 K range. A nonconvergent reversible phase transition has been noticed at about 320 K. This transition is associated with a change in dynamic equilibrium of hydrate species and partial reduction/oxidation (redox) W 6+ ↔ W 5+ . Expressive structure changes lie in the P-O bonding inside Keggin's anion and the H 5 O 2 + conformational angle. © 2002 Published by Elsevier Science B.V.
1497.
Minić, D; Maričić, A; Šušić, N
Kinetics of thermal relaxation of cold sintered amorphous powder of 82Ni18P Journal Article
In: Science of Sintering, vol. 34, no. 2, pp. 157-161, 2002.
@article{Minić2002157,
title = {Kinetics of thermal relaxation of cold sintered amorphous powder of 82Ni18P},
author = {D Minić and A Maričić and N Šušić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-73449119917&doi=10.2298%2fSOS0202157M&partnerID=40&md5=7df708f911b26618a15b9383fb8f89c7},
doi = {10.2298/SOS0202157M},
year = {2002},
date = {2002-01-01},
journal = {Science of Sintering},
volume = {34},
number = {2},
pages = {157-161},
abstract = {The process of thermal stabilization of cold sintered amorphous powder of 82Ni18P was studied using the method of measuring the electrical resistance in non-isothermal and isothermal conditions. It was shown that the process of crystallization followed by further structural arrangement occurs in stages in the temperature interval from 623 to 723 K. By measuring the change in electrical resistance at constant temperatures},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The process of thermal stabilization of cold sintered amorphous powder of 82Ni18P was studied using the method of measuring the electrical resistance in non-isothermal and isothermal conditions. It was shown that the process of crystallization followed by further structural arrangement occurs in stages in the temperature interval from 623 to 723 K. By measuring the change in electrical resistance at constant temperatures
1498.
Perić, M; Stevanović, Lj.; Jerosimić, S
Ab initio study of the A2∏-X2∏ electronic transition in HCCS Journal Article
In: Journal of Chemical Physics, vol. 117, no. 9, pp. 4233-4244, 2002.
@article{Perić20024233,
title = {Ab initio study of the A2∏-X2∏ electronic transition in HCCS},
author = {M Perić and Lj. Stevanović and S Jerosimić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0036732064&doi=10.1063%2f1.1497683&partnerID=40&md5=60ee2bfd9cdcaa2bf7e4c5be9793ddd8},
doi = {10.1063/1.1497683},
year = {2002},
date = {2002-01-01},
journal = {Journal of Chemical Physics},
volume = {117},
number = {9},
pages = {4233-4244},
abstract = {Potential energy surfaces for the electronic states of the HCCS radical correlating at linear nuclear arrangement with the A 2π state were calculated by an extensive ab initio approach. These calculations were undertaken by a variational approach based on the use of normal bending coordinates. Simulations of the spectrum were performed using ab initio calculations. It was concluded that the spin-orbit coupling constant supported the experimental findings.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Potential energy surfaces for the electronic states of the HCCS radical correlating at linear nuclear arrangement with the A 2π state were calculated by an extensive ab initio approach. These calculations were undertaken by a variational approach based on the use of normal bending coordinates. Simulations of the spectrum were performed using ab initio calculations. It was concluded that the spin-orbit coupling constant supported the experimental findings.
1499.
Stanisavljev, D R; Vukojević, V B
Investigation of the influence of heavy water on kinetic pathways in the Bray-Liebhafsky reaction Journal Article
In: Journal of Physical Chemistry A, vol. 106, no. 23, pp. 5618-5625, 2002.
@article{Stanisavljev20025618,
title = {Investigation of the influence of heavy water on kinetic pathways in the Bray-Liebhafsky reaction},
author = {D R Stanisavljev and V B Vukojević},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0037071959&doi=10.1021%2fjp020086d&partnerID=40&md5=55657c9c18543ecd04788e1192b46734},
doi = {10.1021/jp020086d},
year = {2002},
date = {2002-01-01},
journal = {Journal of Physical Chemistry A},
volume = {106},
number = {23},
pages = {5618-5625},
abstract = {A more detailed investigation of the influence of heavy water on the two main kinetic pathways underlying the mechanism of the Bray-Liebhafsky (BL) reaction is performed. The course of the BL reaction at four temperatures was monitored with an improved experimental setup, enabling simultaneous recordings of the potential of the platinum electrode, the concentration of I2, and the oxygen production rate. It is confirmed that by replacing ordinary water with heavy water, the oxidation pathway is more effectively accelerated than the reduction pathway. Influence of the isotopic substitution on the acidity of the BL system, VIS spectra of iodine in D2O, and the reaction between iodine and deuterated peroxide are investigated in separate experiments. It is concluded that the observed enhancement of the oxidation pathway cannot be simply explained by the isotopic effect. Hence, the possible role of bulk water in the process of shifting the whole reaction mechanism toward the oxidation pathway is discussed.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
A more detailed investigation of the influence of heavy water on the two main kinetic pathways underlying the mechanism of the Bray-Liebhafsky (BL) reaction is performed. The course of the BL reaction at four temperatures was monitored with an improved experimental setup, enabling simultaneous recordings of the potential of the platinum electrode, the concentration of I2, and the oxygen production rate. It is confirmed that by replacing ordinary water with heavy water, the oxidation pathway is more effectively accelerated than the reduction pathway. Influence of the isotopic substitution on the acidity of the BL system, VIS spectra of iodine in D2O, and the reaction between iodine and deuterated peroxide are investigated in separate experiments. It is concluded that the observed enhancement of the oxidation pathway cannot be simply explained by the isotopic effect. Hence, the possible role of bulk water in the process of shifting the whole reaction mechanism toward the oxidation pathway is discussed.
1500.
Rakić, V; Dondur, V; Mioč, U; Jovanović, D
Microcalorimetry in the identification and characterization of the most reactive active sites of heterogeneous catalysts Journal Article
In: Topics in Catalysis, vol. 19, no. 3-4, pp. 241-247, 2002.
@article{Rakić2002241,
title = {Microcalorimetry in the identification and characterization of the most reactive active sites of heterogeneous catalysts},
author = {V Rakić and V Dondur and U Mioč and D Jovanović},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0041803857&partnerID=40&md5=efb4d7ec554ac2599ed7d68cb5bc1784},
year = {2002},
date = {2002-01-01},
journal = {Topics in Catalysis},
volume = {19},
number = {3-4},
pages = {241-247},
abstract = {The microcalorimetric technique has been applied to investigate the strongest active sites of zeolites, heteropolyacids and perovskites. The differential heats of adsorption of carbon monoxide, ammonia and oxygen were determined. The results imply that the method is very useful in the identification and characterization of the most reactive active sites of solid catalytic materials. © 2002 Plenum Publishing Corporation.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The microcalorimetric technique has been applied to investigate the strongest active sites of zeolites, heteropolyacids and perovskites. The differential heats of adsorption of carbon monoxide, ammonia and oxygen were determined. The results imply that the method is very useful in the identification and characterization of the most reactive active sites of solid catalytic materials. © 2002 Plenum Publishing Corporation.
2003
Rašković, M; Holclajtner-Antunović, I; Tripković, M; Marković, D
Excitation and analytical characteristics of an ethanol loaded U-shaped arc Journal Article
In: Journal of the Serbian Chemical Society, vol. 68, no. 2, pp. 109-118, 2003.
@article{Rašković2003109,
title = {Excitation and analytical characteristics of an ethanol loaded U-shaped arc},
author = {M Rašković and I Holclajtner-Antunović and M Tripković and D Marković},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0037250339&doi=10.2298%2fJSC0302109R&partnerID=40&md5=13f981051a693e9f9f3ace46d64ce0ca},
doi = {10.2298/JSC0302109R},
year = {2003},
date = {2003-01-01},
journal = {Journal of the Serbian Chemical Society},
volume = {68},
number = {2},
pages = {109-118},
abstract = {The effect of the ethanol load on the discharge and analytical parameters of an argon stabilised U-shaped DC arc has been recorded. Measurements of the radial distribution of the apparent temperatures and the electron number density of the DC plasma showed that ethanol addition causes a decrease in both plasma parameters. The changes in the plasma characteristics, as well as in transport and atomisation processes of the analyte cause a general change in the spectral line intensities, which depends on the physical characteristics of the analyte and the quantity of ethanol loaded into the plasma. Improved detection limits were obtained for V and Mn when a 10 % (v/v) water-ethanol solution was nebulized into the plasma.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The effect of the ethanol load on the discharge and analytical parameters of an argon stabilised U-shaped DC arc has been recorded. Measurements of the radial distribution of the apparent temperatures and the electron number density of the DC plasma showed that ethanol addition causes a decrease in both plasma parameters. The changes in the plasma characteristics, as well as in transport and atomisation processes of the analyte cause a general change in the spectral line intensities, which depends on the physical characteristics of the analyte and the quantity of ethanol loaded into the plasma. Improved detection limits were obtained for V and Mn when a 10 % (v/v) water-ethanol solution was nebulized into the plasma.
Rakić, V; Dondur, V; Hercigonja, R
FTIR study of carbon monoxide adsorption on ion-exchanged X, Y and mordenite type zeolites Journal Article
In: Journal of the Serbian Chemical Society, vol. 68, no. 4-5, pp. 409-416, 2003.
@article{Rakić2003409,
title = {FTIR study of carbon monoxide adsorption on ion-exchanged X, Y and mordenite type zeolites},
author = {V Rakić and V Dondur and R Hercigonja},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0037835574&doi=10.2298%2fJSC0305409R&partnerID=40&md5=05cc510d5671335cb7c34d0142404516},
doi = {10.2298/JSC0305409R},
year = {2003},
date = {2003-01-01},
journal = {Journal of the Serbian Chemical Society},
volume = {68},
number = {4-5},
pages = {409-416},
abstract = {In this work Fourier transform infrared (FTIR) study has been applied to study the adsorption of carbon monoxide on transition metal (Mn+, Co2+, Ni2+) ion-exchanged zeolites type Y, X and mordenites. The adsorption of CO at room temperature produces overlapping IR absorption bands in the 2120-2200 cm-1 region. The frequency of the band around 2200 cm-1 is found to be dependent not only on the charge-balancing transition metal cation, but also on the framework composition. The frequencies of the band near 1600 cm-1 was found to be dependent on the Si/Al ratio of the investigated zeolites.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
In this work Fourier transform infrared (FTIR) study has been applied to study the adsorption of carbon monoxide on transition metal (Mn+, Co2+, Ni2+) ion-exchanged zeolites type Y, X and mordenites. The adsorption of CO at room temperature produces overlapping IR absorption bands in the 2120-2200 cm-1 region. The frequency of the band around 2200 cm-1 is found to be dependent not only on the charge-balancing transition metal cation, but also on the framework composition. The frequencies of the band near 1600 cm-1 was found to be dependent on the Si/Al ratio of the investigated zeolites.
Vojinović, V; Mentus, S; Komnenić, V
Thermodynamic and kinetic behavior of hydrogen electrode in a solution of 0.5 M KClO4 in dimethyl sulphoxide Journal Article
In: Journal of the Serbian Chemical Society, vol. 68, no. 6, pp. 497-504, 2003.
@article{Vojinović2003497,
title = {Thermodynamic and kinetic behavior of hydrogen electrode in a solution of 0.5 M KClO4 in dimethyl sulphoxide},
author = {V Vojinović and S Mentus and V Komnenić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0043267598&doi=10.2298%2fJSC0306497V&partnerID=40&md5=eaa89ccec2a80b2652f9bc12e094b55b},
doi = {10.2298/JSC0306497V},
year = {2003},
date = {2003-01-01},
journal = {Journal of the Serbian Chemical Society},
volume = {68},
number = {6},
pages = {497-504},
abstract = {The hydrogen electrode on an interface platinum/dimethyl sulphoxide + 0.5 M KClO4 solution was examined from both the thermodynamic and kinetic aspect, using HCl as a proton source. The equilibrium potential was shown to obey a Nemstian dependence on concentration. The voltammograms recorded using a rotating platinum disc electrode evidenced that the cathodic evolution of hydrogen proceeds under mixed, activation-diffusion control. The diffusion coefficient of the proton was determined to amount to 4.5×10-6 cm2 s-1. In the region of activation control, a Tafel slope of about 0.110 V dec-1 was estimated, which indicates that the Volmer reaction is the rate detemaining step.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The hydrogen electrode on an interface platinum/dimethyl sulphoxide + 0.5 M KClO4 solution was examined from both the thermodynamic and kinetic aspect, using HCl as a proton source. The equilibrium potential was shown to obey a Nemstian dependence on concentration. The voltammograms recorded using a rotating platinum disc electrode evidenced that the cathodic evolution of hydrogen proceeds under mixed, activation-diffusion control. The diffusion coefficient of the proton was determined to amount to 4.5×10-6 cm2 s-1. In the region of activation control, a Tafel slope of about 0.110 V dec-1 was estimated, which indicates that the Volmer reaction is the rate detemaining step.
Rackić, V M; Dondur, V T; Hercigonja, R V; Andrić, V
The investigation of strong active sites of dealuminated Y-type zeolite by TPD of carbon monoxide Journal Article
In: Journal of Thermal Analysis and Calorimetry, vol. 72, no. 3, pp. 761-767, 2003.
@article{Rackić2003761,
title = {The investigation of strong active sites of dealuminated Y-type zeolite by TPD of carbon monoxide},
author = {V M Rackić and V T Dondur and R V Hercigonja and V Andrić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0042698815&doi=10.1023%2fA%3a1025049727731&partnerID=40&md5=f817d34cc6d778dcdce8046d2d1ca827},
doi = {10.1023/A:1025049727731},
year = {2003},
date = {2003-01-01},
journal = {Journal of Thermal Analysis and Calorimetry},
volume = {72},
number = {3},
pages = {761-767},
abstract = {The active sites of hydrogen-exchanged Y zeolite (HY) and dealuminated (HDY) zeolites are investigated by TPD of carbon monoxide. Only the high temperature TPD spectra of CO (T M ≈620-690°C) were observed, meaning that CO molecules interact with very strong acid sites. The amounts of CO bonded on these sites are small (less than 1 molecule per unit cell), The strong influence of dealumination on the coverage degree is found. The calculated values for kinetic parameters indicate chemisorption of CO in the investigated systems (E des ≈240 kJ mol -1 , A≈10 11 s -1 ).},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The active sites of hydrogen-exchanged Y zeolite (HY) and dealuminated (HDY) zeolites are investigated by TPD of carbon monoxide. Only the high temperature TPD spectra of CO (T M ≈620-690°C) were observed, meaning that CO molecules interact with very strong acid sites. The amounts of CO bonded on these sites are small (less than 1 molecule per unit cell), The strong influence of dealumination on the coverage degree is found. The calculated values for kinetic parameters indicate chemisorption of CO in the investigated systems (E des ≈240 kJ mol -1 , A≈10 11 s -1 ).
Mihajlović, R P; Ignjatović, N R; Todorović, M R; Hoclajtner-Antunović, I; Kaljević, V M
Spectrophotometric determination of phosphorus in coal and coal ash using bismuth-phosphomolybdate complex Journal Article
In: Journal of the Serbian Chemical Society, vol. 68, no. 1, pp. 65-73, 2003.
@article{Mihajlović200365,
title = {Spectrophotometric determination of phosphorus in coal and coal ash using bismuth-phosphomolybdate complex},
author = {R P Mihajlović and N R Ignjatović and M R Todorović and I Hoclajtner-Antunović and V M Kaljević},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0037283389&doi=10.2298%2fJSC0301065M&partnerID=40&md5=28de9967f945fc96fc82754f2431228f},
doi = {10.2298/JSC0301065M},
year = {2003},
date = {2003-01-01},
journal = {Journal of the Serbian Chemical Society},
volume = {68},
number = {1},
pages = {65-73},
abstract = {A modified spectrophotometric method using the bismuth phosphomolybdate complex for the determination of phosphorus in coal and coal ash is suggested. Bismuth together with phosphate and molybdate forms a very stable complex in acid medium which turns blue ("molibdenum blue") by reduction with ascorbic acid. The apparent molar absorptivity of PBiMo is 1.66×104 dm3 mol-1cm-1 at 720 nm and 2.10×104 dm3 mol-1cm-1 at 670 nm isobutyl methyl ketone (MIBK). Interference caused by the ions present are within the tolerance limits (±2%). Beer's law is obeyed in the for concentration range to 0.6 μg/mL (aqueous solution) and to 1.2 μg/mL P (MIBK). The sesitivity of the proposed method is 0.0078 μg/mL (aqueous solution) and 0.0066 μg/mL (MIBK).},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
A modified spectrophotometric method using the bismuth phosphomolybdate complex for the determination of phosphorus in coal and coal ash is suggested. Bismuth together with phosphate and molybdate forms a very stable complex in acid medium which turns blue ("molibdenum blue") by reduction with ascorbic acid. The apparent molar absorptivity of PBiMo is 1.66×104 dm3 mol-1cm-1 at 720 nm and 2.10×104 dm3 mol-1cm-1 at 670 nm isobutyl methyl ketone (MIBK). Interference caused by the ions present are within the tolerance limits (±2%). Beer's law is obeyed in the for concentration range to 0.6 μg/mL (aqueous solution) and to 1.2 μg/mL P (MIBK). The sesitivity of the proposed method is 0.0078 μg/mL (aqueous solution) and 0.0066 μg/mL (MIBK).
Simonović, B R; Mentus, S V; Dimitrijević, R
Kinetic and structural aspects of tantalum hydride formation Journal Article
In: Journal of the Serbian Chemical Society, vol. 68, no. 8-9, pp. 657-663, 2003.
@article{Simonović2003657,
title = {Kinetic and structural aspects of tantalum hydride formation},
author = {B R Simonović and S V Mentus and R Dimitrijević},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-1442324582&doi=10.2298%2fJSC0309657S&partnerID=40&md5=5e2fdd48e0ae0688f77dd0e7b878c9df},
doi = {10.2298/JSC0309657S},
year = {2003},
date = {2003-01-01},
journal = {Journal of the Serbian Chemical Society},
volume = {68},
number = {8-9},
pages = {657-663},
abstract = {Tantalum hydrides of various composition were synthesized by equilibrating tantalum with hydrogen at six different temperatures from 573 to 823 K, under a constant hydrogen pressure of 1 bar. Both the exact Ta/H mole ratios and the kinetic parameters of hydriding were determined on the basis of the dependence of the H/Ta mole ratio on time. The influence of stoichiometry on the appearance of X-ray powder diffractograms at room temperature was studied. As a consequence of hydriding, for ratios H/Ta > 0.2, the original bcc Ta-lattice undergoes distortion, manifesting itself as both a shift and a splitting of the X-ray patterns in the X-ray diffractograms. For samples with H/Ta < 0.2, the appearance of some superstructure reflections at low Bragg angles was noted, which suggests a long range ordering of hydrogen with orthorhombic symmetry.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Tantalum hydrides of various composition were synthesized by equilibrating tantalum with hydrogen at six different temperatures from 573 to 823 K, under a constant hydrogen pressure of 1 bar. Both the exact Ta/H mole ratios and the kinetic parameters of hydriding were determined on the basis of the dependence of the H/Ta mole ratio on time. The influence of stoichiometry on the appearance of X-ray powder diffractograms at room temperature was studied. As a consequence of hydriding, for ratios H/Ta > 0.2, the original bcc Ta-lattice undergoes distortion, manifesting itself as both a shift and a splitting of the X-ray patterns in the X-ray diffractograms. For samples with H/Ta < 0.2, the appearance of some superstructure reflections at low Bragg angles was noted, which suggests a long range ordering of hydrogen with orthorhombic symmetry.
Stojić, D. Lj.; Miljanić, Š S; Jakšić, M M
Electrochemical H/D Isotope Separation Efficiency Along A Hypo-Hyper-d-Electronic (Ti-Ni) Phase Diagram Journal Article
In: Journal of New Materials for Electrochemical Systems, vol. 6, no. 1, pp. 55-60, 2003.
@article{Stojić200355,
title = {Electrochemical H/D Isotope Separation Efficiency Along A Hypo-Hyper-d-Electronic (Ti-Ni) Phase Diagram},
author = {D.Lj. Stojić and Š S Miljanić and M M Jakšić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-2342558524&partnerID=40&md5=6014a61152a146f684ceb4df623bd44e},
year = {2003},
date = {2003-01-01},
journal = {Journal of New Materials for Electrochemical Systems},
volume = {6},
number = {1},
pages = {55-60},
abstract = {Intermetallic phases (stable and meta-stable) along the Ti-Ni phase diagram, together with the pure constituents (Ti, Ni), have been investigated as cathode materials for separation of hydrogen isotopes (protium and deuterium, H/D) by water electrolysis from alkaline solutions. The H/D separation factors, obtained using these electrodes, were compared with their hydridic and electrocatalytic features significant for the hydrogen evolution reaction (HER), the enthalpies of intermetallic formation, and their electronic work function. As with the similar behavior of transition elements along the Periodic Table, close correlations were found amongst them. The Ti-Ni intermetallic phases obey typical volcanic plots for all the mutually compared properties along their phase diagram. The TiNi 3 alloy with an average d 8 - electronic configuration has maximal electrocatalytic activity for both hydrogen evolution and H/D electrochemical separation processes, the highest value of electronic work function, as well as maximal enthalpy of formation. Intermetallic phases Ti 2 Ni and TiNi, with an average electronic configuration between d 4 and d 5 , exhibit lower values on each of these specific curves. The similarity between the mentioned features suggests that the average electronic configuration of these intermetallic phases determine overall electrode process kinetics, isotope separation efficiency, bond strength, electronic work function, and other physical and chemical properties.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Intermetallic phases (stable and meta-stable) along the Ti-Ni phase diagram, together with the pure constituents (Ti, Ni), have been investigated as cathode materials for separation of hydrogen isotopes (protium and deuterium, H/D) by water electrolysis from alkaline solutions. The H/D separation factors, obtained using these electrodes, were compared with their hydridic and electrocatalytic features significant for the hydrogen evolution reaction (HER), the enthalpies of intermetallic formation, and their electronic work function. As with the similar behavior of transition elements along the Periodic Table, close correlations were found amongst them. The Ti-Ni intermetallic phases obey typical volcanic plots for all the mutually compared properties along their phase diagram. The TiNi 3 alloy with an average d 8 - electronic configuration has maximal electrocatalytic activity for both hydrogen evolution and H/D electrochemical separation processes, the highest value of electronic work function, as well as maximal enthalpy of formation. Intermetallic phases Ti 2 Ni and TiNi, with an average electronic configuration between d 4 and d 5 , exhibit lower values on each of these specific curves. The similarity between the mentioned features suggests that the average electronic configuration of these intermetallic phases determine overall electrode process kinetics, isotope separation efficiency, bond strength, electronic work function, and other physical and chemical properties.
Marković, R; Shirazi, A; Džambaski, Z; Baranac, M; Minić, D
Hydrogen bonding in push-pull 5-substituted-2-alkylidene-4-oxothiazolidines: 1H-NMR spectroscopic study Journal Article
In: Journal of the Serbian Chemical Society, vol. 68, no. 1, pp. 1-7, 2003.
@article{Marković20031c,
title = {Hydrogen bonding in push-pull 5-substituted-2-alkylidene-4-oxothiazolidines: 1H-NMR spectroscopic study},
author = {R Marković and A Shirazi and Z Džambaski and M Baranac and D Minić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0037286126&doi=10.2298%2fJSC0301001M&partnerID=40&md5=9bb0e1581b049352221219407db96ca0},
doi = {10.2298/JSC0301001M},
year = {2003},
date = {2003-01-01},
journal = {Journal of the Serbian Chemical Society},
volume = {68},
number = {1},
pages = {1-7},
abstract = {Application of dynamic 1H-NMR spectroscopy added to the understanding of the hydrogen bonds existing in the structurally related 5-substituted-2-alkylidene-4-oxothiazolidines in polar and apolar solvents. The equilibrated mixtures of these typical push-pull alkenes in CDCl3 consist of the intramolecularly H-bonded (E)-isomer and intermolecularly H-bonded (Z)-isomer in varying proportions which depend on the solvent polarity. For the representative of the series. (Z)-2-(5-ethoxycarbonylmethyl-4-oxothiazolidin-2-ylidene)-1-phenylethanone, a concentration effect on the degree of intermolecular hydrogen bonding in apolar CDCl3 has been studied.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Application of dynamic 1H-NMR spectroscopy added to the understanding of the hydrogen bonds existing in the structurally related 5-substituted-2-alkylidene-4-oxothiazolidines in polar and apolar solvents. The equilibrated mixtures of these typical push-pull alkenes in CDCl3 consist of the intramolecularly H-bonded (E)-isomer and intermolecularly H-bonded (Z)-isomer in varying proportions which depend on the solvent polarity. For the representative of the series. (Z)-2-(5-ethoxycarbonylmethyl-4-oxothiazolidin-2-ylidene)-1-phenylethanone, a concentration effect on the degree of intermolecular hydrogen bonding in apolar CDCl3 has been studied.
Micic, M; Leblanc, R M; Markovic, D; Stamatovic, A; Vukelic, N; Polic, P
Atlas of the tropospheric aerosols from Belgrade troposphere Journal Article
In: Fresenius Environmental Bulletin, vol. 12, no. 9, pp. 1015-1024, 2003.
@article{Micic20031015,
title = {Atlas of the tropospheric aerosols from Belgrade troposphere},
author = {M Micic and R M Leblanc and D Markovic and A Stamatovic and N Vukelic and P Polic},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0142092493&partnerID=40&md5=52d0e1aab41155bc632ce90e4b2a8917},
year = {2003},
date = {2003-01-01},
journal = {Fresenius Environmental Bulletin},
volume = {12},
number = {9},
pages = {1015-1024},
abstract = {This SEM/ESEM (environmental scanning electron microscope) study provides inventory/ particulate atlas of the atmospheric aerosols collected from the lower troposphere of the Belgrade (Yugoslavia) suburb as a model system for the particulate matter from urban environment in Balkan peninsula. Most significant aerosol fractions observed in Belgrade troposphere are carbonaceous soot particles and coal ash particulates. Carbonaceous soot are equally represented by fine soot originating from internal combustion engines and that of local coal power plants, which are, together with associated ash deposits, the main contributor to the particulate pollution in the Belgrade region.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
This SEM/ESEM (environmental scanning electron microscope) study provides inventory/ particulate atlas of the atmospheric aerosols collected from the lower troposphere of the Belgrade (Yugoslavia) suburb as a model system for the particulate matter from urban environment in Balkan peninsula. Most significant aerosol fractions observed in Belgrade troposphere are carbonaceous soot particles and coal ash particulates. Carbonaceous soot are equally represented by fine soot originating from internal combustion engines and that of local coal power plants, which are, together with associated ash deposits, the main contributor to the particulate pollution in the Belgrade region.
Mioč, U B; Todorović, M R; Uskoković-Marković, S M; Davidović, M; Kremenović, A; Bire, A Spasojević-De; Čajkovski, T; Likar-Smiljanić, V; Biljić, R
Structure and proton conductivity in a magnesium salt of 12-tungstophosphoric acid Journal Article
In: Solid State Ionics, vol. 162-163, pp. 217-223, 2003.
@article{Mioč2003217,
title = {Structure and proton conductivity in a magnesium salt of 12-tungstophosphoric acid},
author = {U B Mioč and M R Todorović and S M Uskoković-Marković and M Davidović and A Kremenović and A Spasojević-De Bire and T Čajkovski and V Likar-Smiljanić and R Biljić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0141620278&doi=10.1016%2fS0167-2738%2803%2900257-1&partnerID=40&md5=ab85b53b03274ea858da8666155c3c9d},
doi = {10.1016/S0167-2738(03)00257-1},
year = {2003},
date = {2003-01-01},
journal = {Solid State Ionics},
volume = {162-163},
pages = {217-223},
abstract = {Some structural properties of a magnesium salt of 12-tungstophosphoric acid, MgHPW 12 O 40 ·nH 2 O (MgHWPA-n), are reported. The influence of the Mg 2+ ion on the structure, dynamics of the protonic species, and dielectric and conductive characteristics of the salt have been studied. The interaction of protonic species with Keggin anion was discussed. Preliminary results of the crystal structure indicate that the structure is composed of Keggin anions and Mg(OH 2 ) 6 aqua-complexes. Some comparisons are made with other alkaline-earth and alkaline salts of WPA. The results of thermal analysis (TGA and DTA), X-ray diffraction (XRD), scanning electron microscopy (SEM), infrared spectroscopy (IR), conductivity and permittivity measurements of MgHWPA-n are reported and discussed. © 2003 Elsevier B.V. All rights reserved.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Some structural properties of a magnesium salt of 12-tungstophosphoric acid, MgHPW 12 O 40 ·nH 2 O (MgHWPA-n), are reported. The influence of the Mg 2+ ion on the structure, dynamics of the protonic species, and dielectric and conductive characteristics of the salt have been studied. The interaction of protonic species with Keggin anion was discussed. Preliminary results of the crystal structure indicate that the structure is composed of Keggin anions and Mg(OH 2 ) 6 aqua-complexes. Some comparisons are made with other alkaline-earth and alkaline salts of WPA. The results of thermal analysis (TGA and DTA), X-ray diffraction (XRD), scanning electron microscopy (SEM), infrared spectroscopy (IR), conductivity and permittivity measurements of MgHWPA-n are reported and discussed. © 2003 Elsevier B.V. All rights reserved.
Čajkovski, T; Davidović, M; Pissis, P; Polizos, G; Čajkovski, D; Likar-Smiljanić, V; Biljić, R; Nedić, Z; Mioč, U B
Dielectric investigation of electrical conductivity in the copper salt of the 12-tungstophosphoric acid hydrate Journal Article
In: Solid State Ionics, vol. 162-163, pp. 203-208, 2003.
@article{Čajkovski2003203,
title = {Dielectric investigation of electrical conductivity in the copper salt of the 12-tungstophosphoric acid hydrate},
author = {T Čajkovski and M Davidović and P Pissis and G Polizos and D Čajkovski and V Likar-Smiljanić and R Biljić and Z Nedić and U B Mioč},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0141620280&doi=10.1016%2fS0167-2738%2803%2900233-9&partnerID=40&md5=c2257689c95e0bb5d441a60fe8299831},
doi = {10.1016/S0167-2738(03)00233-9},
year = {2003},
date = {2003-01-01},
journal = {Solid State Ionics},
volume = {162-163},
pages = {203-208},
abstract = {The electrical and dielectric properties of the copper salt of 12-tungstophosphoric acid (WPA) hydrate have been investigated by broadband dielectric relaxation spectroscopy (DRS). This work is a continuation of our previous investigations on the influence of monovalent and bivalent cations on the dielectric properties of WPA hydrates salts. Measurements were made in the frequency range 10 mHz-1 MHz in order to explore the long-range dynamics, following recent microwave measurements aiming at the local dynamics properties. Experiments were done in the temperature interval 293-350 K. Data treatment included complex permittivity ε*, complex electric modulus M* and complex impedance Z* formalism, Arrhenius diagram and Cole-Cole diagrams. The results are discussed in terms of conductivity relaxation and conductivity current relaxation. Rather long conductivity relaxation times measured seem to correspond to ion jumping processes. A phase transition was observed at 323 K. © 2003 Elsevier B.V. All rights reserved.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The electrical and dielectric properties of the copper salt of 12-tungstophosphoric acid (WPA) hydrate have been investigated by broadband dielectric relaxation spectroscopy (DRS). This work is a continuation of our previous investigations on the influence of monovalent and bivalent cations on the dielectric properties of WPA hydrates salts. Measurements were made in the frequency range 10 mHz-1 MHz in order to explore the long-range dynamics, following recent microwave measurements aiming at the local dynamics properties. Experiments were done in the temperature interval 293-350 K. Data treatment included complex permittivity ε*, complex electric modulus M* and complex impedance Z* formalism, Arrhenius diagram and Cole-Cole diagrams. The results are discussed in terms of conductivity relaxation and conductivity current relaxation. Rather long conductivity relaxation times measured seem to correspond to ion jumping processes. A phase transition was observed at 323 K. © 2003 Elsevier B.V. All rights reserved.
Ciric-Marjanovic, G; Cvjetićanin, N; Mentus, S; Budinski-Simendić, J; Krakovsky, I
Electrochemical polymerization of 2-methyl-1-naphthylamine Journal Article
In: Polymer Bulletin, vol. 50, no. 5-6, pp. 319-326, 2003.
@article{Ciric-Marjanovic2003319,
title = {Electrochemical polymerization of 2-methyl-1-naphthylamine},
author = {G Ciric-Marjanovic and N Cvjetićanin and S Mentus and J Budinski-Simendić and I Krakovsky},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0041767576&doi=10.1007%2fs00289-003-0174-8&partnerID=40&md5=599248f285679da6f416ef214e5a73af},
doi = {10.1007/s00289-003-0174-8},
year = {2003},
date = {2003-01-01},
journal = {Polymer Bulletin},
volume = {50},
number = {5-6},
pages = {319-326},
abstract = {2-methyl-1-naphthylamine has been electropolymerized from the acidic aqueous solutions by three different synthetic routes. The polymerization products, deposited at a platinum working electrode as very adherent films, were characterized by cyclic voltammetry (CV), infrared spectroscopy (IR) and gel permeation chromatography (GPC). In a strongly acidic medium, the products display redox properties, in a form of two well-defined redox pairs with the formal potentials at 0.19 V and 0.47 V vs. SCE. IR-spectroscopy indicated that the polymerization occurs via the -NH2 groups, by different coupling ways: N-C(4), N-C(5) and N-C(7), as well as that ClO4- ions incorporate themselves into the product of electropolymerization. GPC of the polymerization products evidenced oligomeric chains with molar masses up to 1600 g/mol as main species.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
2-methyl-1-naphthylamine has been electropolymerized from the acidic aqueous solutions by three different synthetic routes. The polymerization products, deposited at a platinum working electrode as very adherent films, were characterized by cyclic voltammetry (CV), infrared spectroscopy (IR) and gel permeation chromatography (GPC). In a strongly acidic medium, the products display redox properties, in a form of two well-defined redox pairs with the formal potentials at 0.19 V and 0.47 V vs. SCE. IR-spectroscopy indicated that the polymerization occurs via the -NH2 groups, by different coupling ways: N-C(4), N-C(5) and N-C(7), as well as that ClO4- ions incorporate themselves into the product of electropolymerization. GPC of the polymerization products evidenced oligomeric chains with molar masses up to 1600 g/mol as main species.
2002
Micic, M; Orbulescu, J; Radotic, K; Jeremic, M; Sui, G; Zheng, Y; Leblanc, R M
ZL-DHP lignin model compound at the air-water interface Journal Article
In: Biophysical Chemistry, vol. 99, no. 1, pp. 55-62, 2002.
@article{Micic200255,
title = {ZL-DHP lignin model compound at the air-water interface},
author = {M Micic and J Orbulescu and K Radotic and M Jeremic and G Sui and Y Zheng and R M Leblanc},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0037015323&doi=10.1016%2fS0301-4622%2802%2900121-7&partnerID=40&md5=25d4054147ce8a8c261c65a81ec53f75},
doi = {10.1016/S0301-4622(02)00121-7},
year = {2002},
date = {2002-01-01},
journal = {Biophysical Chemistry},
volume = {99},
number = {1},
pages = {55-62},
abstract = {In this paper we present our surface chemistry studies of enzymatically polymerized, poly-coniferyl alcohol lignin model compound (dehydrogenate polymer a.k.a. ZL-DHP) at the air-water interface. Using the CHCl3/MeOH (5:1 v/v) spreading solvent, we found an average molecular area of ZL-DHP of approximately 1200 Å2. The monolayer expresses a high compressibility with a collapsed area of 500 Å2 and collapsed surface pressure of 28 mN m-1. In the range of applied surface pressures, ZL-DHP polymer have no phase changes, as shown by the very high linearity (R=0.994) of absorbance vs. surface pressure cure. There was no symmetry transitions observed as shown by absence of shifts of absorption peak maximums. © 2002 Elsevier Science B.V. All rights reserved.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
In this paper we present our surface chemistry studies of enzymatically polymerized, poly-coniferyl alcohol lignin model compound (dehydrogenate polymer a.k.a. ZL-DHP) at the air-water interface. Using the CHCl3/MeOH (5:1 v/v) spreading solvent, we found an average molecular area of ZL-DHP of approximately 1200 Å2. The monolayer expresses a high compressibility with a collapsed area of 500 Å2 and collapsed surface pressure of 28 mN m-1. In the range of applied surface pressures, ZL-DHP polymer have no phase changes, as shown by the very high linearity (R=0.994) of absorbance vs. surface pressure cure. There was no symmetry transitions observed as shown by absence of shifts of absorption peak maximums. © 2002 Elsevier Science B.V. All rights reserved.
Ciric-Marjanovic, G; Marjanović, B; Stamenković, V; Vitnik, Ž; Antić, V; Juranić, I
Structure and stereochemistry of electrochemically synthesized poly-(1-naphthylamine) from neutral acetonitrile solution Journal Article
In: Journal of the Serbian Chemical Society, vol. 67, no. 12, pp. 867-877, 2002.
@article{Ciric-Marjanovic2002867,
title = {Structure and stereochemistry of electrochemically synthesized poly-(1-naphthylamine) from neutral acetonitrile solution},
author = {G Ciric-Marjanovic and B Marjanović and V Stamenković and Ž Vitnik and V Antić and I Juranić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0036984346&doi=10.2298%2fJSC0212867C&partnerID=40&md5=a9d7eb1879dac41da4db504851ba7977},
doi = {10.2298/JSC0212867C},
year = {2002},
date = {2002-01-01},
journal = {Journal of the Serbian Chemical Society},
volume = {67},
number = {12},
pages = {867-877},
abstract = {Poly-(1-naphthylamine) films were synthesized potentiodinamically and potentiostatically from 1-naphthylamine in neutral acetonitrile medium using a platinum electrode. These polymer films were investigated by infrared spectroscopy. Contrary to earlier published results neglecting the stereochemistry of the poly-(1-naphthylamine), we predict on the basis of quantum stereochemical analysis of the possible structural subunits of the polymer, that the ordinary N-C(4) coupled product is not predominant in the polymer because it is far removed from the expected planarity. Based on the results of IR investigations and semiempirical quantum chemical calculations, it is proposed that the polymer products are formed via mixed N-C(4), N-C(5) and N-C(7) coupling routes. The heats of formation of the oxidized 1-naphthylamine dimers and hexamers were calculated.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Poly-(1-naphthylamine) films were synthesized potentiodinamically and potentiostatically from 1-naphthylamine in neutral acetonitrile medium using a platinum electrode. These polymer films were investigated by infrared spectroscopy. Contrary to earlier published results neglecting the stereochemistry of the poly-(1-naphthylamine), we predict on the basis of quantum stereochemical analysis of the possible structural subunits of the polymer, that the ordinary N-C(4) coupled product is not predominant in the polymer because it is far removed from the expected planarity. Based on the results of IR investigations and semiempirical quantum chemical calculations, it is proposed that the polymer products are formed via mixed N-C(4), N-C(5) and N-C(7) coupling routes. The heats of formation of the oxidized 1-naphthylamine dimers and hexamers were calculated.
Trifunović, S R; Marković, Z; Sladić, D; Andjelković, K; Saboc, T; Minić, D
In: Journal of the Serbian Chemical Society, vol. 67, no. 2, pp. 115-122, 2002.
@article{Trifunović2002115,
title = {The synthesis and characterization of nickel(II) and copper(II) complexes with the polydentate dialkyl dithiocarbamic acid ligand 3-dithiocarboxy-3-aza-5-aminopentanoate},
author = {S R Trifunović and Z Marković and D Sladić and K Andjelković and T Saboc and D Minić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0036003609&doi=10.2298%2fJSC0202115T&partnerID=40&md5=23859e875b4fefdba7bac7868bbc3c1b},
doi = {10.2298/JSC0202115T},
year = {2002},
date = {2002-01-01},
journal = {Journal of the Serbian Chemical Society},
volume = {67},
number = {2},
pages = {115-122},
abstract = {Square planar complexes of Ni(II) and Cu(II) with potassium 3-dithiocarboxy-3-aza-5-aminopentanoate have been prepared by direct synthesis. The obtained neutral complexes were characterized by elemental analysis, magnetic susceptibility measurements, infrared and electronic spectra. The thermal behaviour of both the Ni(II) and Cu(II) complexes, and the ligand itself was investigated by DSC and TG.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Square planar complexes of Ni(II) and Cu(II) with potassium 3-dithiocarboxy-3-aza-5-aminopentanoate have been prepared by direct synthesis. The obtained neutral complexes were characterized by elemental analysis, magnetic susceptibility measurements, infrared and electronic spectra. The thermal behaviour of both the Ni(II) and Cu(II) complexes, and the ligand itself was investigated by DSC and TG.
Kremenovi, A; Biré, A Spasojevi-de; Bourée, F; Colomban, P; Dimitrijevi, R; Davidovi, M; Mioč, U B
In: Solid State Ionics, vol. 150, no. 3-4, pp. 431-442, 2002.
@article{Kremenovi2002431,
title = {Structural modifications of dodecatungstophosphoric acid hexahydrate induced by temperature in the 10-358 K range. In situ high-resolution neutron powder diffraction investigation},
author = {A Kremenovi and A Spasojevi-de Biré and F Bourée and P Colomban and R Dimitrijevi and M Davidovi and U B Mioč},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0036781232&doi=10.1016%2fS0167-2738%2802%2900419-8&partnerID=40&md5=d7523d981d31258cf71c2a9458fbada9},
doi = {10.1016/S0167-2738(02)00419-8},
year = {2002},
date = {2002-01-01},
journal = {Solid State Ionics},
volume = {150},
number = {3-4},
pages = {431-442},
abstract = {Dodecatungstophosphoric acid hexahydrate H 3 PW 12 O 40 ·6H 2 O crystal structure has been investigated by neutron powder diffraction (NPD) at different temperatures in the 10-358 K range. A nonconvergent reversible phase transition has been noticed at about 320 K. This transition is associated with a change in dynamic equilibrium of hydrate species and partial reduction/oxidation (redox) W 6+ ↔ W 5+ . Expressive structure changes lie in the P-O bonding inside Keggin's anion and the H 5 O 2 + conformational angle. © 2002 Published by Elsevier Science B.V.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Dodecatungstophosphoric acid hexahydrate H 3 PW 12 O 40 ·6H 2 O crystal structure has been investigated by neutron powder diffraction (NPD) at different temperatures in the 10-358 K range. A nonconvergent reversible phase transition has been noticed at about 320 K. This transition is associated with a change in dynamic equilibrium of hydrate species and partial reduction/oxidation (redox) W 6+ ↔ W 5+ . Expressive structure changes lie in the P-O bonding inside Keggin's anion and the H 5 O 2 + conformational angle. © 2002 Published by Elsevier Science B.V.
Minić, D; Maričić, A; Šušić, N
Kinetics of thermal relaxation of cold sintered amorphous powder of 82Ni18P Journal Article
In: Science of Sintering, vol. 34, no. 2, pp. 157-161, 2002.
@article{Minić2002157,
title = {Kinetics of thermal relaxation of cold sintered amorphous powder of 82Ni18P},
author = {D Minić and A Maričić and N Šušić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-73449119917&doi=10.2298%2fSOS0202157M&partnerID=40&md5=7df708f911b26618a15b9383fb8f89c7},
doi = {10.2298/SOS0202157M},
year = {2002},
date = {2002-01-01},
journal = {Science of Sintering},
volume = {34},
number = {2},
pages = {157-161},
abstract = {The process of thermal stabilization of cold sintered amorphous powder of 82Ni18P was studied using the method of measuring the electrical resistance in non-isothermal and isothermal conditions. It was shown that the process of crystallization followed by further structural arrangement occurs in stages in the temperature interval from 623 to 723 K. By measuring the change in electrical resistance at constant temperatures},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The process of thermal stabilization of cold sintered amorphous powder of 82Ni18P was studied using the method of measuring the electrical resistance in non-isothermal and isothermal conditions. It was shown that the process of crystallization followed by further structural arrangement occurs in stages in the temperature interval from 623 to 723 K. By measuring the change in electrical resistance at constant temperatures
Perić, M; Stevanović, Lj.; Jerosimić, S
Ab initio study of the A2∏-X2∏ electronic transition in HCCS Journal Article
In: Journal of Chemical Physics, vol. 117, no. 9, pp. 4233-4244, 2002.
@article{Perić20024233,
title = {Ab initio study of the A2∏-X2∏ electronic transition in HCCS},
author = {M Perić and Lj. Stevanović and S Jerosimić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0036732064&doi=10.1063%2f1.1497683&partnerID=40&md5=60ee2bfd9cdcaa2bf7e4c5be9793ddd8},
doi = {10.1063/1.1497683},
year = {2002},
date = {2002-01-01},
journal = {Journal of Chemical Physics},
volume = {117},
number = {9},
pages = {4233-4244},
abstract = {Potential energy surfaces for the electronic states of the HCCS radical correlating at linear nuclear arrangement with the A 2π state were calculated by an extensive ab initio approach. These calculations were undertaken by a variational approach based on the use of normal bending coordinates. Simulations of the spectrum were performed using ab initio calculations. It was concluded that the spin-orbit coupling constant supported the experimental findings.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Potential energy surfaces for the electronic states of the HCCS radical correlating at linear nuclear arrangement with the A 2π state were calculated by an extensive ab initio approach. These calculations were undertaken by a variational approach based on the use of normal bending coordinates. Simulations of the spectrum were performed using ab initio calculations. It was concluded that the spin-orbit coupling constant supported the experimental findings.
Stanisavljev, D R; Vukojević, V B
Investigation of the influence of heavy water on kinetic pathways in the Bray-Liebhafsky reaction Journal Article
In: Journal of Physical Chemistry A, vol. 106, no. 23, pp. 5618-5625, 2002.
@article{Stanisavljev20025618,
title = {Investigation of the influence of heavy water on kinetic pathways in the Bray-Liebhafsky reaction},
author = {D R Stanisavljev and V B Vukojević},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0037071959&doi=10.1021%2fjp020086d&partnerID=40&md5=55657c9c18543ecd04788e1192b46734},
doi = {10.1021/jp020086d},
year = {2002},
date = {2002-01-01},
journal = {Journal of Physical Chemistry A},
volume = {106},
number = {23},
pages = {5618-5625},
abstract = {A more detailed investigation of the influence of heavy water on the two main kinetic pathways underlying the mechanism of the Bray-Liebhafsky (BL) reaction is performed. The course of the BL reaction at four temperatures was monitored with an improved experimental setup, enabling simultaneous recordings of the potential of the platinum electrode, the concentration of I2, and the oxygen production rate. It is confirmed that by replacing ordinary water with heavy water, the oxidation pathway is more effectively accelerated than the reduction pathway. Influence of the isotopic substitution on the acidity of the BL system, VIS spectra of iodine in D2O, and the reaction between iodine and deuterated peroxide are investigated in separate experiments. It is concluded that the observed enhancement of the oxidation pathway cannot be simply explained by the isotopic effect. Hence, the possible role of bulk water in the process of shifting the whole reaction mechanism toward the oxidation pathway is discussed.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
A more detailed investigation of the influence of heavy water on the two main kinetic pathways underlying the mechanism of the Bray-Liebhafsky (BL) reaction is performed. The course of the BL reaction at four temperatures was monitored with an improved experimental setup, enabling simultaneous recordings of the potential of the platinum electrode, the concentration of I2, and the oxygen production rate. It is confirmed that by replacing ordinary water with heavy water, the oxidation pathway is more effectively accelerated than the reduction pathway. Influence of the isotopic substitution on the acidity of the BL system, VIS spectra of iodine in D2O, and the reaction between iodine and deuterated peroxide are investigated in separate experiments. It is concluded that the observed enhancement of the oxidation pathway cannot be simply explained by the isotopic effect. Hence, the possible role of bulk water in the process of shifting the whole reaction mechanism toward the oxidation pathway is discussed.
Rakić, V; Dondur, V; Mioč, U; Jovanović, D
Microcalorimetry in the identification and characterization of the most reactive active sites of heterogeneous catalysts Journal Article
In: Topics in Catalysis, vol. 19, no. 3-4, pp. 241-247, 2002.
@article{Rakić2002241,
title = {Microcalorimetry in the identification and characterization of the most reactive active sites of heterogeneous catalysts},
author = {V Rakić and V Dondur and U Mioč and D Jovanović},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0041803857&partnerID=40&md5=efb4d7ec554ac2599ed7d68cb5bc1784},
year = {2002},
date = {2002-01-01},
journal = {Topics in Catalysis},
volume = {19},
number = {3-4},
pages = {241-247},
abstract = {The microcalorimetric technique has been applied to investigate the strongest active sites of zeolites, heteropolyacids and perovskites. The differential heats of adsorption of carbon monoxide, ammonia and oxygen were determined. The results imply that the method is very useful in the identification and characterization of the most reactive active sites of solid catalytic materials. © 2002 Plenum Publishing Corporation.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The microcalorimetric technique has been applied to investigate the strongest active sites of zeolites, heteropolyacids and perovskites. The differential heats of adsorption of carbon monoxide, ammonia and oxygen were determined. The results imply that the method is very useful in the identification and characterization of the most reactive active sites of solid catalytic materials. © 2002 Plenum Publishing Corporation.