TY  - JOUR
AU  - Ẑujović, Z.
AU  - Srejić, R.
AU  - Vučelić, D.
AU  - Vitorović, Dragomir K.
AU  - Jovančićević, Branimir
PY  - 1995
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/64
AB  - A sample of kerogen from Aleksinac oil shale was examined by high-resolution solid-state 13C n.m.r. spectroscopy. The presence and relative proportions of kerogen structural units were estimated using a combination of NQS and T1ρ{variant}C methods with a peak-synthesis technique applied to the 13C CP-MAS spectrum. Relaxation parameters from these experiments were used to estimate differences in relative 'mobility' of various structural units. The kerogen was found to be highly aliphatic and to contain ∼ 79% long-chain aliphatic plus alicyclic structures, as well as ∼ 9% aromatic structures. These findings are in good agreement with the characterization of the same kerogen from its oxidation products. © 1995.
T2  - Fuel
T1  - Structural analysis of Aleksinac oil shale kerogen by high-resolution solid-state 13C n.m.r. spectroscopy
VL  - 74
IS  - 12
SP  - 1903
EP  - 1909
DO  - 10.1016/0016-2361(95)80026-E
ER  - 

@article{
author = "Ẑujović, Z. and Srejić, R. and Vučelić, D. and Vitorović, Dragomir K. and Jovančićević, Branimir",
year = "1995",
abstract = "A sample of kerogen from Aleksinac oil shale was examined by high-resolution solid-state 13C n.m.r. spectroscopy. The presence and relative proportions of kerogen structural units were estimated using a combination of NQS and T1ρ{variant}C methods with a peak-synthesis technique applied to the 13C CP-MAS spectrum. Relaxation parameters from these experiments were used to estimate differences in relative 'mobility' of various structural units. The kerogen was found to be highly aliphatic and to contain ∼ 79% long-chain aliphatic plus alicyclic structures, as well as ∼ 9% aromatic structures. These findings are in good agreement with the characterization of the same kerogen from its oxidation products. © 1995.",
journal = "Fuel",
title = "Structural analysis of Aleksinac oil shale kerogen by high-resolution solid-state 13C n.m.r. spectroscopy",
volume = "74",
number = "12",
pages = "1903-1909",
doi = "10.1016/0016-2361(95)80026-E"
}

Ẑujović, Z., Srejić, R., Vučelić, D., Vitorović, D. K.,& Jovančićević, B.. (1995). Structural analysis of Aleksinac oil shale kerogen by high-resolution solid-state 13C n.m.r. spectroscopy. in Fuel, 74(12), 1903-1909.
https://doi.org/10.1016/0016-2361(95)80026-E

Ẑujović Z, Srejić R, Vučelić D, Vitorović DK, Jovančićević B. Structural analysis of Aleksinac oil shale kerogen by high-resolution solid-state 13C n.m.r. spectroscopy. in Fuel. 1995;74(12):1903-1909.
doi:10.1016/0016-2361(95)80026-E .

Ẑujović, Z., Srejić, R., Vučelić, D., Vitorović, Dragomir K., Jovančićević, Branimir, "Structural analysis of Aleksinac oil shale kerogen by high-resolution solid-state 13C n.m.r. spectroscopy" in Fuel, 74, no. 12 (1995):1903-1909,
https://doi.org/10.1016/0016-2361(95)80026-E . .

TY  - JOUR
AU  - Jovančićević, Branimir
AU  - Vučelić, D.
AU  - Šaban, M.
AU  - Wehner, H.
AU  - Vitorović, Dragomir K.
PY  - 1993
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/31
AB  - Evidence for catalytic effects of indigenous minerals in the pyrolysis of Aleksinac oil shale kerogen was found by investigating the liquid products obtained in the Micro Activity Test (MAT) pyrolysis of raw shale and its demineralized substrates. By comparing the corresponding fragmentograms of a demineralized sample with those of a substrate containing only silicate minerals, differences in the side-chain isomerisation of the steranes and triterpanes, and in the side-chain cleavage of the triaromatic steroids were observed. These findings corroborated the previous conclusion, based on MAT parameters and TG weight losses, that the catalytic effect of the indigenous mineral components during the pyrolysis of Aleksinac oil shale kerogen is very low. © 1993.
T2  - Organic Geochemistry
T1  - Investigation of the catalytic effects of indigenous minerals in the pyrolysis of Aleksinac oil shale substrates: Steranes, triterpanes and triaromatic steroids in the pyrolysates
VL  - 20
IS  - 1
SP  - 69
EP  - 76
DO  - 10.1016/0146-6380(93)90082-M
ER  - 

@article{
author = "Jovančićević, Branimir and Vučelić, D. and Šaban, M. and Wehner, H. and Vitorović, Dragomir K.",
year = "1993",
abstract = "Evidence for catalytic effects of indigenous minerals in the pyrolysis of Aleksinac oil shale kerogen was found by investigating the liquid products obtained in the Micro Activity Test (MAT) pyrolysis of raw shale and its demineralized substrates. By comparing the corresponding fragmentograms of a demineralized sample with those of a substrate containing only silicate minerals, differences in the side-chain isomerisation of the steranes and triterpanes, and in the side-chain cleavage of the triaromatic steroids were observed. These findings corroborated the previous conclusion, based on MAT parameters and TG weight losses, that the catalytic effect of the indigenous mineral components during the pyrolysis of Aleksinac oil shale kerogen is very low. © 1993.",
journal = "Organic Geochemistry",
title = "Investigation of the catalytic effects of indigenous minerals in the pyrolysis of Aleksinac oil shale substrates: Steranes, triterpanes and triaromatic steroids in the pyrolysates",
volume = "20",
number = "1",
pages = "69-76",
doi = "10.1016/0146-6380(93)90082-M"
}

Jovančićević, B., Vučelić, D., Šaban, M., Wehner, H.,& Vitorović, D. K.. (1993). Investigation of the catalytic effects of indigenous minerals in the pyrolysis of Aleksinac oil shale substrates: Steranes, triterpanes and triaromatic steroids in the pyrolysates. in Organic Geochemistry, 20(1), 69-76.
https://doi.org/10.1016/0146-6380(93)90082-M

Jovančićević B, Vučelić D, Šaban M, Wehner H, Vitorović DK. Investigation of the catalytic effects of indigenous minerals in the pyrolysis of Aleksinac oil shale substrates: Steranes, triterpanes and triaromatic steroids in the pyrolysates. in Organic Geochemistry. 1993;20(1):69-76.
doi:10.1016/0146-6380(93)90082-M .

Jovančićević, Branimir, Vučelić, D., Šaban, M., Wehner, H., Vitorović, Dragomir K., "Investigation of the catalytic effects of indigenous minerals in the pyrolysis of Aleksinac oil shale substrates: Steranes, triterpanes and triaromatic steroids in the pyrolysates" in Organic Geochemistry, 20, no. 1 (1993):69-76,
https://doi.org/10.1016/0146-6380(93)90082-M . .

TY  - JOUR
AU  - Vučelić, D.
AU  - Marković, Violeta
AU  - Vučelić, V.
AU  - Spiridonović, D.
AU  - Jovančićević, Branimir
AU  - Vitorović, Dragomir K.
PY  - 1992
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/30
AB  - The catalytic effect of indigenous minerals in the pyrolysis of Aleksinac (Yugoslavia) oil shale was studied in this paper. The substrates were prepared by gradual removal of the mineral constituents (carbonates, silicates, pyrite) and the free and bound bitumens. The substrates were analyzed by chemical methods, X-ray diffraction, porosimetry, thermal analysis, 13C NMR, and standard ASTM Micro Activity Test (MAT) designed for the investigation of cracking catalysts. The liquid pyrolysis products were analyzed by organic geochemical techniques as well. Based on the yields of gaseous and liquid products and the coke, conversion degrees, GC analyses (MAT parameters) and weight losses (TG parameter), the catalytic effect of indigenous mineral components in the pyrolysis of Aleksinac oil shale organic matter was found to be very low. The results suggested that principal organic matter changes should be attributed to thermal rather than to catalytic cracking. © 1992.
T2  - Organic Geochemistry
T1  - Investigation of catalytic effects of indigenous minerals in the pyrolysis of Aleksinac oil shale organic matter
VL  - 19
IS  - 4-6
SP  - 445
EP  - 453
DO  - 10.1016/0146-6380(92)90011-L
ER  - 

@article{
author = "Vučelić, D. and Marković, Violeta and Vučelić, V. and Spiridonović, D. and Jovančićević, Branimir and Vitorović, Dragomir K.",
year = "1992",
abstract = "The catalytic effect of indigenous minerals in the pyrolysis of Aleksinac (Yugoslavia) oil shale was studied in this paper. The substrates were prepared by gradual removal of the mineral constituents (carbonates, silicates, pyrite) and the free and bound bitumens. The substrates were analyzed by chemical methods, X-ray diffraction, porosimetry, thermal analysis, 13C NMR, and standard ASTM Micro Activity Test (MAT) designed for the investigation of cracking catalysts. The liquid pyrolysis products were analyzed by organic geochemical techniques as well. Based on the yields of gaseous and liquid products and the coke, conversion degrees, GC analyses (MAT parameters) and weight losses (TG parameter), the catalytic effect of indigenous mineral components in the pyrolysis of Aleksinac oil shale organic matter was found to be very low. The results suggested that principal organic matter changes should be attributed to thermal rather than to catalytic cracking. © 1992.",
journal = "Organic Geochemistry",
title = "Investigation of catalytic effects of indigenous minerals in the pyrolysis of Aleksinac oil shale organic matter",
volume = "19",
number = "4-6",
pages = "445-453",
doi = "10.1016/0146-6380(92)90011-L"
}

Vučelić, D., Marković, V., Vučelić, V., Spiridonović, D., Jovančićević, B.,& Vitorović, D. K.. (1992). Investigation of catalytic effects of indigenous minerals in the pyrolysis of Aleksinac oil shale organic matter. in Organic Geochemistry, 19(4-6), 445-453.
https://doi.org/10.1016/0146-6380(92)90011-L

Vučelić D, Marković V, Vučelić V, Spiridonović D, Jovančićević B, Vitorović DK. Investigation of catalytic effects of indigenous minerals in the pyrolysis of Aleksinac oil shale organic matter. in Organic Geochemistry. 1992;19(4-6):445-453.
doi:10.1016/0146-6380(92)90011-L .

Vučelić, D., Marković, Violeta, Vučelić, V., Spiridonović, D., Jovančićević, Branimir, Vitorović, Dragomir K., "Investigation of catalytic effects of indigenous minerals in the pyrolysis of Aleksinac oil shale organic matter" in Organic Geochemistry, 19, no. 4-6 (1992):445-453,
https://doi.org/10.1016/0146-6380(92)90011-L . .

TY  - JOUR
AU  - Juranić, N.
AU  - Malinar, M.J.
AU  - Radivojša, P.N.
AU  - Zarić, Snežana D.
AU  - Vučelić, D.
AU  - Vučić, M.
AU  - Ćelap, M.B.
PY  - 1988
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/58
AB  - In the cis(NO2),trans(NH2)-bis(aminocarboxylato) dinitrocobalt/ate(III) isomers, containing glycinato, S-alaninato, S-n-valinato, S-valinato, S-n-leucinato, S-leucinato, S-i-leucinato and S-arginine ligands, respectively, it was found that in the Δ-isomers circular dichroic spectra are determined by the configurational contribution to the optical activity. This is connected in the case of optically active ligands with the chair conformation of the chelate rings and the equatorial position of the ring side group. In the Δ-isomers, λ- conformation of the aminocarboxylato chelate rings and the axial position of the ring side groups induce a considerable contribution to the optical activity, which varies from complex to complex. NMR spectroscopy showed that these variations are related to small changes in the chelate ring conformation in such a way that a more axial position of a ring side group induces a larger contribution. The λ-conformation of a S-aminocarboxylato chelate ring induces a large negative contribution to the circular dichroism of the investigated complexes. © 1988.
T2  - Polyhedron
T1  - Investigation of the effect of the aminocarboxylato chelate conformation on the optical activity of the cis(NO2),trans(NH2) -bis(aminocarboxylato)dinitrocobalt/ate(III) isomers
VL  - 7
IS  - 13
SP  - 1153
EP  - 1158
DO  - 10.1016/S0277-5387(00)81203-6
ER  - 

@article{
author = "Juranić, N. and Malinar, M.J. and Radivojša, P.N. and Zarić, Snežana D. and Vučelić, D. and Vučić, M. and Ćelap, M.B.",
year = "1988",
abstract = "In the cis(NO2),trans(NH2)-bis(aminocarboxylato) dinitrocobalt/ate(III) isomers, containing glycinato, S-alaninato, S-n-valinato, S-valinato, S-n-leucinato, S-leucinato, S-i-leucinato and S-arginine ligands, respectively, it was found that in the Δ-isomers circular dichroic spectra are determined by the configurational contribution to the optical activity. This is connected in the case of optically active ligands with the chair conformation of the chelate rings and the equatorial position of the ring side group. In the Δ-isomers, λ- conformation of the aminocarboxylato chelate rings and the axial position of the ring side groups induce a considerable contribution to the optical activity, which varies from complex to complex. NMR spectroscopy showed that these variations are related to small changes in the chelate ring conformation in such a way that a more axial position of a ring side group induces a larger contribution. The λ-conformation of a S-aminocarboxylato chelate ring induces a large negative contribution to the circular dichroism of the investigated complexes. © 1988.",
journal = "Polyhedron",
title = "Investigation of the effect of the aminocarboxylato chelate conformation on the optical activity of the cis(NO2),trans(NH2) -bis(aminocarboxylato)dinitrocobalt/ate(III) isomers",
volume = "7",
number = "13",
pages = "1153-1158",
doi = "10.1016/S0277-5387(00)81203-6"
}

Juranić, N., Malinar, M.J., Radivojša, P.N., Zarić, S. D., Vučelić, D., Vučić, M.,& Ćelap, M.B.. (1988). Investigation of the effect of the aminocarboxylato chelate conformation on the optical activity of the cis(NO2),trans(NH2) -bis(aminocarboxylato)dinitrocobalt/ate(III) isomers. in Polyhedron, 7(13), 1153-1158.
https://doi.org/10.1016/S0277-5387(00)81203-6

Juranić N, Malinar M, Radivojša P, Zarić SD, Vučelić D, Vučić M, Ćelap M. Investigation of the effect of the aminocarboxylato chelate conformation on the optical activity of the cis(NO2),trans(NH2) -bis(aminocarboxylato)dinitrocobalt/ate(III) isomers. in Polyhedron. 1988;7(13):1153-1158.
doi:10.1016/S0277-5387(00)81203-6 .

Juranić, N., Malinar, M.J., Radivojša, P.N., Zarić, Snežana D., Vučelić, D., Vučić, M., Ćelap, M.B., "Investigation of the effect of the aminocarboxylato chelate conformation on the optical activity of the cis(NO2),trans(NH2) -bis(aminocarboxylato)dinitrocobalt/ate(III) isomers" in Polyhedron, 7, no. 13 (1988):1153-1158,
https://doi.org/10.1016/S0277-5387(00)81203-6 . .