TY  - JOUR
AU  - Hollo, Berta
AU  - Rodić, Marko V.
AU  - Bera, Oskar
AU  - Jovicic, Mirjana
AU  - Leovac, Vukadin M.
AU  - Tomić, Zoran D.
AU  - Szecsenyi, Katalin Meszaros
PY  - 2013
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5791
AB  - The crystal and molecular structure of [Cu(ampf)(ClO4)(MeOH)(2)]ClO4, (1), ampf = N, N-bis(4-acetyl-5-methylpyrazol-3-yl)formamidine, determined by X-ray crystallography is described and compared with the structurally related copper(II) complexes, formed under similar experimental conditions, using Cu-II salts with different anions. The complex formation is discussed in view of the structures of cobalt(II) and nickel(II) complexes with the same organic ligand and different anions, also formed under similar reaction conditions. Solvent molecules coordinated to the central atom play an important role in biologic systems. To get a better insight into the desolvation mechanism, in this study the desolvation pattern of 1 is presented. As in literature little attention is paid to the desolvation mechanism of solvate complexes, the desolvation mechanism of three, potentially biologically active isostructural pairs of octahedral Ni-II and Co-II compounds with ampf and dmpc (3,5-dimethyl-1H-pyrazole-1-carboxamidine) ligands are evaluated and compared with the desolvation of 1. The results of the thermal data are discussed on the basis of structural features of the compounds. The minor differences in structures of the related compounds cannot be straightforwardly connected with the different solvent evaporation mechanism. To explain the differences found in desolvation pattern in isostructural Co-II and Ni-II complexes the Jahn-Teller effect is proposed.
T2  - Structural Chemistry
T1  - Cation- and/or anion-directed reaction routes. Could the desolvation pattern of isostructural coordination compounds be related to their molecular structure?
VL  - 24
IS  - 6
SP  - 2193
EP  - 2201
DO  - 10.1007/s11224-013-0270-9
ER  - 

@article{
author = "Hollo, Berta and Rodić, Marko V. and Bera, Oskar and Jovicic, Mirjana and Leovac, Vukadin M. and Tomić, Zoran D. and Szecsenyi, Katalin Meszaros",
year = "2013",
abstract = "The crystal and molecular structure of [Cu(ampf)(ClO4)(MeOH)(2)]ClO4, (1), ampf = N, N-bis(4-acetyl-5-methylpyrazol-3-yl)formamidine, determined by X-ray crystallography is described and compared with the structurally related copper(II) complexes, formed under similar experimental conditions, using Cu-II salts with different anions. The complex formation is discussed in view of the structures of cobalt(II) and nickel(II) complexes with the same organic ligand and different anions, also formed under similar reaction conditions. Solvent molecules coordinated to the central atom play an important role in biologic systems. To get a better insight into the desolvation mechanism, in this study the desolvation pattern of 1 is presented. As in literature little attention is paid to the desolvation mechanism of solvate complexes, the desolvation mechanism of three, potentially biologically active isostructural pairs of octahedral Ni-II and Co-II compounds with ampf and dmpc (3,5-dimethyl-1H-pyrazole-1-carboxamidine) ligands are evaluated and compared with the desolvation of 1. The results of the thermal data are discussed on the basis of structural features of the compounds. The minor differences in structures of the related compounds cannot be straightforwardly connected with the different solvent evaporation mechanism. To explain the differences found in desolvation pattern in isostructural Co-II and Ni-II complexes the Jahn-Teller effect is proposed.",
journal = "Structural Chemistry",
title = "Cation- and/or anion-directed reaction routes. Could the desolvation pattern of isostructural coordination compounds be related to their molecular structure?",
volume = "24",
number = "6",
pages = "2193-2201",
doi = "10.1007/s11224-013-0270-9"
}

Hollo, B., Rodić, M. V., Bera, O., Jovicic, M., Leovac, V. M., Tomić, Z. D.,& Szecsenyi, K. M.. (2013). Cation- and/or anion-directed reaction routes. Could the desolvation pattern of isostructural coordination compounds be related to their molecular structure?. in Structural Chemistry, 24(6), 2193-2201.
https://doi.org/10.1007/s11224-013-0270-9

Hollo B, Rodić MV, Bera O, Jovicic M, Leovac VM, Tomić ZD, Szecsenyi KM. Cation- and/or anion-directed reaction routes. Could the desolvation pattern of isostructural coordination compounds be related to their molecular structure?. in Structural Chemistry. 2013;24(6):2193-2201.
doi:10.1007/s11224-013-0270-9 .

Hollo, Berta, Rodić, Marko V., Bera, Oskar, Jovicic, Mirjana, Leovac, Vukadin M., Tomić, Zoran D., Szecsenyi, Katalin Meszaros, "Cation- and/or anion-directed reaction routes. Could the desolvation pattern of isostructural coordination compounds be related to their molecular structure?" in Structural Chemistry, 24, no. 6 (2013):2193-2201,
https://doi.org/10.1007/s11224-013-0270-9 . .

TY  - JOUR
AU  - Vojinović-Ješić, Ljiljana S.
AU  - Češljević, Valerija I.
AU  - Bogdanović, Goran A.
AU  - Leovac, Vukadin M.
AU  - Szecsenyi, Katalin Meszaros
AU  - Divjakovic, Vladimir
AU  - Joksović, Milan D.
PY  - 2010
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/4079
AB  - The article describes the synthesis and crystal structure of the Mn(II) complex with 2,6-diacetylpyridine bis (Girard-T hydrazone), (H(2)dap(GT)(2))(2+), of the formula [Mn(H(2)dap(GT)(2))(NCS)(2)](NCS)(2)center dot MeOH. The complex has a pentagonal-bipyramidal coordination geometry, with pentadentate N(3)O(2) ligand in the equatorial plane and two isothiocyanato groups in the axial positions. Both the ligand and the complex are characterized by their FT-IR spectra and thermal data. (C) 2010 Elsevier B.V. All rights reserved.
T2  - Inorganic Chemistry Communications
T1  - Transition metal complexes with Girard reagent-based ligands. Part V. Synthesis, characterization and crystal structure of pentagonal-bipyramidal manganese(II) complex with 2,6-diacetylpyridine bis(Girard-T hydrazone)
VL  - 13
IS  - 9
SP  - 1085
EP  - 1088
DO  - 10.1016/j.inoche.2010.06.022
ER  - 

@article{
author = "Vojinović-Ješić, Ljiljana S. and Češljević, Valerija I. and Bogdanović, Goran A. and Leovac, Vukadin M. and Szecsenyi, Katalin Meszaros and Divjakovic, Vladimir and Joksović, Milan D.",
year = "2010",
abstract = "The article describes the synthesis and crystal structure of the Mn(II) complex with 2,6-diacetylpyridine bis (Girard-T hydrazone), (H(2)dap(GT)(2))(2+), of the formula [Mn(H(2)dap(GT)(2))(NCS)(2)](NCS)(2)center dot MeOH. The complex has a pentagonal-bipyramidal coordination geometry, with pentadentate N(3)O(2) ligand in the equatorial plane and two isothiocyanato groups in the axial positions. Both the ligand and the complex are characterized by their FT-IR spectra and thermal data. (C) 2010 Elsevier B.V. All rights reserved.",
journal = "Inorganic Chemistry Communications",
title = "Transition metal complexes with Girard reagent-based ligands. Part V. Synthesis, characterization and crystal structure of pentagonal-bipyramidal manganese(II) complex with 2,6-diacetylpyridine bis(Girard-T hydrazone)",
volume = "13",
number = "9",
pages = "1085-1088",
doi = "10.1016/j.inoche.2010.06.022"
}

Vojinović-Ješić, L. S., Češljević, V. I., Bogdanović, G. A., Leovac, V. M., Szecsenyi, K. M., Divjakovic, V.,& Joksović, M. D.. (2010). Transition metal complexes with Girard reagent-based ligands. Part V. Synthesis, characterization and crystal structure of pentagonal-bipyramidal manganese(II) complex with 2,6-diacetylpyridine bis(Girard-T hydrazone). in Inorganic Chemistry Communications, 13(9), 1085-1088.
https://doi.org/10.1016/j.inoche.2010.06.022

Vojinović-Ješić LS, Češljević VI, Bogdanović GA, Leovac VM, Szecsenyi KM, Divjakovic V, Joksović MD. Transition metal complexes with Girard reagent-based ligands. Part V. Synthesis, characterization and crystal structure of pentagonal-bipyramidal manganese(II) complex with 2,6-diacetylpyridine bis(Girard-T hydrazone). in Inorganic Chemistry Communications. 2010;13(9):1085-1088.
doi:10.1016/j.inoche.2010.06.022 .

Vojinović-Ješić, Ljiljana S., Češljević, Valerija I., Bogdanović, Goran A., Leovac, Vukadin M., Szecsenyi, Katalin Meszaros, Divjakovic, Vladimir, Joksović, Milan D., "Transition metal complexes with Girard reagent-based ligands. Part V. Synthesis, characterization and crystal structure of pentagonal-bipyramidal manganese(II) complex with 2,6-diacetylpyridine bis(Girard-T hydrazone)" in Inorganic Chemistry Communications, 13, no. 9 (2010):1085-1088,
https://doi.org/10.1016/j.inoche.2010.06.022 . .

TY  - JOUR
AU  - Hollo, Berta
AU  - Tomić, Zoran D.
AU  - Pogany, Peter
AU  - Kovacs, Attila
AU  - Leovac, Vukadin M.
AU  - Szecsenyi, Katalin Meszaros
PY  - 2009
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3839
AB  - The complex formation of 3,5-dimethylpyrazole-1-carboxamidinium nitrate, HL center dot HNO(3) with ammine complexes of cadmium(II) halides (Cl, Br, I) and zinc(II) chloride has been investigated under self-controlled reaction conditions. The complexes have been characterized by X-ray diffraction, FT-IR spectroscopy, thermal analysis and quantum chemical calculations. In the case of cadmium bromide and iodide salts, isostructural complexes with composition of [CdX(2)(HL)(2)] were formed. With CdCl(2) a binuclear octahedral [Cd(2)(HL)(4)(mu-Cl)(2)](NO(3))(2) complex is obtained. Zinc(II) chloride with HL center dot HNO(3) gives [Zn(HL)(2)Cl]NO(3), the zinc center exhibiting severely distorted five-coordinate stereochemistry, intermediate between an ideal trigonal bipyramid and a square pyramid. The course of complex formation as well as the thermal properties of the compounds has been explained using the HSAB principle. The assignment of the FT-IR spectra was supported by DFT computations. (C) 2009 Elsevier Ltd. All rights reserved.
T2  - Polyhedron
T1  - Transition metal complexes with pyrazole-based ligands. Part 28. Synthesis, structural, DFT and thermal studies of cadmium(II) halides and zinc(II) chloride complexes with 3,5-dimethylpyrazole-1-carboxamidine
VL  - 28
IS  - 17
SP  - 3881
EP  - 3889
DO  - 10.1016/j.poly.2009.08.020
ER  - 

@article{
author = "Hollo, Berta and Tomić, Zoran D. and Pogany, Peter and Kovacs, Attila and Leovac, Vukadin M. and Szecsenyi, Katalin Meszaros",
year = "2009",
abstract = "The complex formation of 3,5-dimethylpyrazole-1-carboxamidinium nitrate, HL center dot HNO(3) with ammine complexes of cadmium(II) halides (Cl, Br, I) and zinc(II) chloride has been investigated under self-controlled reaction conditions. The complexes have been characterized by X-ray diffraction, FT-IR spectroscopy, thermal analysis and quantum chemical calculations. In the case of cadmium bromide and iodide salts, isostructural complexes with composition of [CdX(2)(HL)(2)] were formed. With CdCl(2) a binuclear octahedral [Cd(2)(HL)(4)(mu-Cl)(2)](NO(3))(2) complex is obtained. Zinc(II) chloride with HL center dot HNO(3) gives [Zn(HL)(2)Cl]NO(3), the zinc center exhibiting severely distorted five-coordinate stereochemistry, intermediate between an ideal trigonal bipyramid and a square pyramid. The course of complex formation as well as the thermal properties of the compounds has been explained using the HSAB principle. The assignment of the FT-IR spectra was supported by DFT computations. (C) 2009 Elsevier Ltd. All rights reserved.",
journal = "Polyhedron",
title = "Transition metal complexes with pyrazole-based ligands. Part 28. Synthesis, structural, DFT and thermal studies of cadmium(II) halides and zinc(II) chloride complexes with 3,5-dimethylpyrazole-1-carboxamidine",
volume = "28",
number = "17",
pages = "3881-3889",
doi = "10.1016/j.poly.2009.08.020"
}

Hollo, B., Tomić, Z. D., Pogany, P., Kovacs, A., Leovac, V. M.,& Szecsenyi, K. M.. (2009). Transition metal complexes with pyrazole-based ligands. Part 28. Synthesis, structural, DFT and thermal studies of cadmium(II) halides and zinc(II) chloride complexes with 3,5-dimethylpyrazole-1-carboxamidine. in Polyhedron, 28(17), 3881-3889.
https://doi.org/10.1016/j.poly.2009.08.020

Hollo B, Tomić ZD, Pogany P, Kovacs A, Leovac VM, Szecsenyi KM. Transition metal complexes with pyrazole-based ligands. Part 28. Synthesis, structural, DFT and thermal studies of cadmium(II) halides and zinc(II) chloride complexes with 3,5-dimethylpyrazole-1-carboxamidine. in Polyhedron. 2009;28(17):3881-3889.
doi:10.1016/j.poly.2009.08.020 .

Hollo, Berta, Tomić, Zoran D., Pogany, Peter, Kovacs, Attila, Leovac, Vukadin M., Szecsenyi, Katalin Meszaros, "Transition metal complexes with pyrazole-based ligands. Part 28. Synthesis, structural, DFT and thermal studies of cadmium(II) halides and zinc(II) chloride complexes with 3,5-dimethylpyrazole-1-carboxamidine" in Polyhedron, 28, no. 17 (2009):3881-3889,
https://doi.org/10.1016/j.poly.2009.08.020 . .

TY  - JOUR
AU  - Jaćimović, Željko K.
AU  - Bogdanović, Goran A.
AU  - Hollo, Berta
AU  - Leovac, Vukadin M.
AU  - Szecsenyi, Katalin Meszaros
PY  - 2009
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3843
AB  - The work is concerned with the crystal and molecular structures of zinc(II) and mercury(II) complexes with 4-acetyl-3-amino-5-methylpyrazole (aamp) of the coordination formulae [Zn(NCS)(2)(aaMP)(2)] and (HaaMP)(2)[Hg(SCN)(4)]. The zinc(II) complex was obtained by the reaction of a warm methanolic solution of aamp with a mixture of zinc(II) nitrate and ammonium thiocyanate, whereas the mercury(II) complex was prepared by the reaction of a warm methanolic solution of aamp and a warm, slightly acidified aqueous solution of [Hg(SCN)(4)](2-). Both complexes have a tetrahedral geometry, which in the case of zinc complex is formed by monodentate coordination of two aamp molecules and two isothiocyanate groups. The Zn(II) and Hg(II) atoms have significantly deformed coordination geometry. In both crystal structures the pyrazole derivative has a planar form, probably stabilized by an intramolecular N-H center dot center dot center dot O hydrogen bond. Apart from the X-ray structural analysis, the isolated complexes were characterized by elemental analysis, IR spectroscopy, conductometric measurements and thermal analysis.
T2  - Journal of the Serbian Chemical Society
T1  - Transition metal complexes with pyrazole-based ligands. Part 29. Reactions of zinc(II) and mercury(II) thiocyanate with 4-acetyl-3-amino-5-methylpyrazole
VL  - 74
IS  - 11
SP  - 1259
EP  - 1271
DO  - 10.2298/JSC0911259J
ER  - 

@article{
author = "Jaćimović, Željko K. and Bogdanović, Goran A. and Hollo, Berta and Leovac, Vukadin M. and Szecsenyi, Katalin Meszaros",
year = "2009",
abstract = "The work is concerned with the crystal and molecular structures of zinc(II) and mercury(II) complexes with 4-acetyl-3-amino-5-methylpyrazole (aamp) of the coordination formulae [Zn(NCS)(2)(aaMP)(2)] and (HaaMP)(2)[Hg(SCN)(4)]. The zinc(II) complex was obtained by the reaction of a warm methanolic solution of aamp with a mixture of zinc(II) nitrate and ammonium thiocyanate, whereas the mercury(II) complex was prepared by the reaction of a warm methanolic solution of aamp and a warm, slightly acidified aqueous solution of [Hg(SCN)(4)](2-). Both complexes have a tetrahedral geometry, which in the case of zinc complex is formed by monodentate coordination of two aamp molecules and two isothiocyanate groups. The Zn(II) and Hg(II) atoms have significantly deformed coordination geometry. In both crystal structures the pyrazole derivative has a planar form, probably stabilized by an intramolecular N-H center dot center dot center dot O hydrogen bond. Apart from the X-ray structural analysis, the isolated complexes were characterized by elemental analysis, IR spectroscopy, conductometric measurements and thermal analysis.",
journal = "Journal of the Serbian Chemical Society",
title = "Transition metal complexes with pyrazole-based ligands. Part 29. Reactions of zinc(II) and mercury(II) thiocyanate with 4-acetyl-3-amino-5-methylpyrazole",
volume = "74",
number = "11",
pages = "1259-1271",
doi = "10.2298/JSC0911259J"
}

Jaćimović, Ž. K., Bogdanović, G. A., Hollo, B., Leovac, V. M.,& Szecsenyi, K. M.. (2009). Transition metal complexes with pyrazole-based ligands. Part 29. Reactions of zinc(II) and mercury(II) thiocyanate with 4-acetyl-3-amino-5-methylpyrazole. in Journal of the Serbian Chemical Society, 74(11), 1259-1271.
https://doi.org/10.2298/JSC0911259J

Jaćimović ŽK, Bogdanović GA, Hollo B, Leovac VM, Szecsenyi KM. Transition metal complexes with pyrazole-based ligands. Part 29. Reactions of zinc(II) and mercury(II) thiocyanate with 4-acetyl-3-amino-5-methylpyrazole. in Journal of the Serbian Chemical Society. 2009;74(11):1259-1271.
doi:10.2298/JSC0911259J .

Jaćimović, Željko K., Bogdanović, Goran A., Hollo, Berta, Leovac, Vukadin M., Szecsenyi, Katalin Meszaros, "Transition metal complexes with pyrazole-based ligands. Part 29. Reactions of zinc(II) and mercury(II) thiocyanate with 4-acetyl-3-amino-5-methylpyrazole" in Journal of the Serbian Chemical Society, 74, no. 11 (2009):1259-1271,
https://doi.org/10.2298/JSC0911259J . .

TY  - JOUR
AU  - Leovac, Vukadin M.
AU  - Tomić, Zoran D.
AU  - Kovacs, Attila
AU  - Joksović, Milan D.
AU  - Jovanović, Ljijana S.
AU  - Szecsenyi, Katalin Meszaros
PY  - 2008
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3352
AB  - In the reaction of Co(NO3)(2) center dot 6H(2)O with 4-acetyl-3-amino-5-methylpyrazole (aamp) two octahedral Co(II) complexes, [Co(aamp)2(H2O)(4)](NO3)(2), 1, and [Co(ampf)(MeOH)(2)NO3]NO3 (ampf= N,N-bis(4-acetyl-5-metliylpyrazole-3-yl)formamidine), 2, were obtained, depending on the reaction conditions. The presence of water in the reaction system leads to incorporation of water molecules into the crystal lattice and I was formed. In all anhydrous environment, due to addition of CH(OEt)3, the fusion of two aamp) was induced through their NH2-groups, incorporating the methine group of CH(OEt)(3). As a result, complex 2, containing an adenino-mimetic NNO pharmacophore ligand, was obtained. The crystal and molecular structure of both compounds was determined. The coordination of aamp in I was achieved through N2 of the pyrazole ring. On the contrary, in 2, an unusual coordination mode of pyrazole is found: one of the pyrazole moieties, due to steric hindrance, coordinates through the oxygen atom of the acetyl group instead of N2. The complexes were characterized by elemental analysis and electronic spectra. For 2 a comprehensive IR spectral analysis is given. The metalligand interactions in 2 are analyzed by quantum chemical computations. The desolvation mechanism of both compounds is discussed in detail. (c) 2007 Elsevier B.V. All rights reserved.
T2  - Journal of Organometallic Chemistry
T1  - Cobalt(II) complexes with disubstituted 3-aminopyrazole derivative: Mononuclear Co(II) complex with in situ prepared formamidine ligand
VL  - 693
IS  - 1
SP  - 77
EP  - 86
DO  - 10.1016/j.jorganchem.2007.10.018
ER  - 

@article{
author = "Leovac, Vukadin M. and Tomić, Zoran D. and Kovacs, Attila and Joksović, Milan D. and Jovanović, Ljijana S. and Szecsenyi, Katalin Meszaros",
year = "2008",
abstract = "In the reaction of Co(NO3)(2) center dot 6H(2)O with 4-acetyl-3-amino-5-methylpyrazole (aamp) two octahedral Co(II) complexes, [Co(aamp)2(H2O)(4)](NO3)(2), 1, and [Co(ampf)(MeOH)(2)NO3]NO3 (ampf= N,N-bis(4-acetyl-5-metliylpyrazole-3-yl)formamidine), 2, were obtained, depending on the reaction conditions. The presence of water in the reaction system leads to incorporation of water molecules into the crystal lattice and I was formed. In all anhydrous environment, due to addition of CH(OEt)3, the fusion of two aamp) was induced through their NH2-groups, incorporating the methine group of CH(OEt)(3). As a result, complex 2, containing an adenino-mimetic NNO pharmacophore ligand, was obtained. The crystal and molecular structure of both compounds was determined. The coordination of aamp in I was achieved through N2 of the pyrazole ring. On the contrary, in 2, an unusual coordination mode of pyrazole is found: one of the pyrazole moieties, due to steric hindrance, coordinates through the oxygen atom of the acetyl group instead of N2. The complexes were characterized by elemental analysis and electronic spectra. For 2 a comprehensive IR spectral analysis is given. The metalligand interactions in 2 are analyzed by quantum chemical computations. The desolvation mechanism of both compounds is discussed in detail. (c) 2007 Elsevier B.V. All rights reserved.",
journal = "Journal of Organometallic Chemistry",
title = "Cobalt(II) complexes with disubstituted 3-aminopyrazole derivative: Mononuclear Co(II) complex with in situ prepared formamidine ligand",
volume = "693",
number = "1",
pages = "77-86",
doi = "10.1016/j.jorganchem.2007.10.018"
}

Leovac, V. M., Tomić, Z. D., Kovacs, A., Joksović, M. D., Jovanović, L. S.,& Szecsenyi, K. M.. (2008). Cobalt(II) complexes with disubstituted 3-aminopyrazole derivative: Mononuclear Co(II) complex with in situ prepared formamidine ligand. in Journal of Organometallic Chemistry, 693(1), 77-86.
https://doi.org/10.1016/j.jorganchem.2007.10.018

Leovac VM, Tomić ZD, Kovacs A, Joksović MD, Jovanović LS, Szecsenyi KM. Cobalt(II) complexes with disubstituted 3-aminopyrazole derivative: Mononuclear Co(II) complex with in situ prepared formamidine ligand. in Journal of Organometallic Chemistry. 2008;693(1):77-86.
doi:10.1016/j.jorganchem.2007.10.018 .

Leovac, Vukadin M., Tomić, Zoran D., Kovacs, Attila, Joksović, Milan D., Jovanović, Ljijana S., Szecsenyi, Katalin Meszaros, "Cobalt(II) complexes with disubstituted 3-aminopyrazole derivative: Mononuclear Co(II) complex with in situ prepared formamidine ligand" in Journal of Organometallic Chemistry, 693, no. 1 (2008):77-86,
https://doi.org/10.1016/j.jorganchem.2007.10.018 . .

TY  - JOUR
AU  - Kovacs, Attila
AU  - Meszaros Szecsenyi, Katalin
AU  - Leovac, Vukadin M.
AU  - Tomić, Zoran D.
AU  - Pokol, Gyoergy
PY  - 2007
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3200
AB  - The trinuclear [Zn-3(Hdmpz)(2)(dmpz)(4)(NCS)(2)] complex (Hdmpz: 3,5-dimethylpyrazole) has been synthesized by the reaction of tetraamminezinc(II) chloride with 3,5-dimethyl-1-thiocarboxamidepyrazole. The ammonia evolving gradually from [Zn(NH3)(4)]Cl-2 ensured a mild gradually increasing basic pH during the synthesis which caused a cleavage of the 1-N-substituent. Moreover, the changing pH controlled the pyrazolate anion-neutral ligand equilibrium, and in this way the formation of the precipitate complex. The structure of the complex was investigated by X-ray diffraction and quantum chemical computations. The complex was characterized in detail by FT-IR-spectroscopy and thermal analysis. The bonding interactions between Zn2+ and the ligands were analysed on the basis of the computed data. (c) 2007 Elsevier B.V. All rights reserved.
T2  - Journal of Organometallic Chemistry
T1  - Synthesis under self-controlled reaction conditions: Reaction of tetraamminezinc(II) chloride with 3,5-dimethyl-1-thiocarboxamide pyrazole
VL  - 692
IS  - 12
SP  - 2582
EP  - 2592
DO  - 10.1016/j.jorganchem.2007.03.003
ER  - 

@article{
author = "Kovacs, Attila and Meszaros Szecsenyi, Katalin and Leovac, Vukadin M. and Tomić, Zoran D. and Pokol, Gyoergy",
year = "2007",
abstract = "The trinuclear [Zn-3(Hdmpz)(2)(dmpz)(4)(NCS)(2)] complex (Hdmpz: 3,5-dimethylpyrazole) has been synthesized by the reaction of tetraamminezinc(II) chloride with 3,5-dimethyl-1-thiocarboxamidepyrazole. The ammonia evolving gradually from [Zn(NH3)(4)]Cl-2 ensured a mild gradually increasing basic pH during the synthesis which caused a cleavage of the 1-N-substituent. Moreover, the changing pH controlled the pyrazolate anion-neutral ligand equilibrium, and in this way the formation of the precipitate complex. The structure of the complex was investigated by X-ray diffraction and quantum chemical computations. The complex was characterized in detail by FT-IR-spectroscopy and thermal analysis. The bonding interactions between Zn2+ and the ligands were analysed on the basis of the computed data. (c) 2007 Elsevier B.V. All rights reserved.",
journal = "Journal of Organometallic Chemistry",
title = "Synthesis under self-controlled reaction conditions: Reaction of tetraamminezinc(II) chloride with 3,5-dimethyl-1-thiocarboxamide pyrazole",
volume = "692",
number = "12",
pages = "2582-2592",
doi = "10.1016/j.jorganchem.2007.03.003"
}

Kovacs, A., Meszaros Szecsenyi, K., Leovac, V. M., Tomić, Z. D.,& Pokol, G.. (2007). Synthesis under self-controlled reaction conditions: Reaction of tetraamminezinc(II) chloride with 3,5-dimethyl-1-thiocarboxamide pyrazole. in Journal of Organometallic Chemistry, 692(12), 2582-2592.
https://doi.org/10.1016/j.jorganchem.2007.03.003

Kovacs A, Meszaros Szecsenyi K, Leovac VM, Tomić ZD, Pokol G. Synthesis under self-controlled reaction conditions: Reaction of tetraamminezinc(II) chloride with 3,5-dimethyl-1-thiocarboxamide pyrazole. in Journal of Organometallic Chemistry. 2007;692(12):2582-2592.
doi:10.1016/j.jorganchem.2007.03.003 .

Kovacs, Attila, Meszaros Szecsenyi, Katalin, Leovac, Vukadin M., Tomić, Zoran D., Pokol, Gyoergy, "Synthesis under self-controlled reaction conditions: Reaction of tetraamminezinc(II) chloride with 3,5-dimethyl-1-thiocarboxamide pyrazole" in Journal of Organometallic Chemistry, 692, no. 12 (2007):2582-2592,
https://doi.org/10.1016/j.jorganchem.2007.03.003 . .

TY  - JOUR
AU  - Leovac, Vukadin M.
AU  - Tomić, Zoran D.
AU  - Szecsenyi, Katalin Meszaros
AU  - Jovanović, Ljiljana S.
AU  - Joksović, Milan D.
PY  - 2007
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3344
AB  - The crystal and molecular structures of four tetrahedral structurally similar [Co(aamp)(2)X-2] complexes (aamp = 4-acetyl-3-amino-5-methylpyrazole, X = Cl, Br, I and NCS) were determined by X-ray diffraction analysis and are discussed in detail. It was found that the different capacity of the ligand X (NCS vs. Cl, Br, I) for the formation of non-bonding contacts influence the mode of molecular association in the solid state. The complexes were characterized by UV-Vis spectroscopy. The first step of the thermal decomposition of the compounds was checked and is discussed in the view of the IR spectrum of the intermediate isolated from [Co(aamp)(2)Br-2] by the quasi-isothermal technique.
T2  - Journal of the Serbian Chemical Society
T1  - Transition metal complexes with pyrazole based ligands. Part 27. Structural and thermal characterization of cobalt(II) halide and pseudohalide complexes with 4-acetyl-3-amino-5-methylpyrazole
VL  - 72
IS  - 12
SP  - 1281
EP  - 1293
DO  - 10.2298/JSC0712281L
ER  - 

@article{
author = "Leovac, Vukadin M. and Tomić, Zoran D. and Szecsenyi, Katalin Meszaros and Jovanović, Ljiljana S. and Joksović, Milan D.",
year = "2007",
abstract = "The crystal and molecular structures of four tetrahedral structurally similar [Co(aamp)(2)X-2] complexes (aamp = 4-acetyl-3-amino-5-methylpyrazole, X = Cl, Br, I and NCS) were determined by X-ray diffraction analysis and are discussed in detail. It was found that the different capacity of the ligand X (NCS vs. Cl, Br, I) for the formation of non-bonding contacts influence the mode of molecular association in the solid state. The complexes were characterized by UV-Vis spectroscopy. The first step of the thermal decomposition of the compounds was checked and is discussed in the view of the IR spectrum of the intermediate isolated from [Co(aamp)(2)Br-2] by the quasi-isothermal technique.",
journal = "Journal of the Serbian Chemical Society",
title = "Transition metal complexes with pyrazole based ligands. Part 27. Structural and thermal characterization of cobalt(II) halide and pseudohalide complexes with 4-acetyl-3-amino-5-methylpyrazole",
volume = "72",
number = "12",
pages = "1281-1293",
doi = "10.2298/JSC0712281L"
}

Leovac, V. M., Tomić, Z. D., Szecsenyi, K. M., Jovanović, L. S.,& Joksović, M. D.. (2007). Transition metal complexes with pyrazole based ligands. Part 27. Structural and thermal characterization of cobalt(II) halide and pseudohalide complexes with 4-acetyl-3-amino-5-methylpyrazole. in Journal of the Serbian Chemical Society, 72(12), 1281-1293.
https://doi.org/10.2298/JSC0712281L

Leovac VM, Tomić ZD, Szecsenyi KM, Jovanović LS, Joksović MD. Transition metal complexes with pyrazole based ligands. Part 27. Structural and thermal characterization of cobalt(II) halide and pseudohalide complexes with 4-acetyl-3-amino-5-methylpyrazole. in Journal of the Serbian Chemical Society. 2007;72(12):1281-1293.
doi:10.2298/JSC0712281L .

Leovac, Vukadin M., Tomić, Zoran D., Szecsenyi, Katalin Meszaros, Jovanović, Ljiljana S., Joksović, Milan D., "Transition metal complexes with pyrazole based ligands. Part 27. Structural and thermal characterization of cobalt(II) halide and pseudohalide complexes with 4-acetyl-3-amino-5-methylpyrazole" in Journal of the Serbian Chemical Society, 72, no. 12 (2007):1281-1293,
https://doi.org/10.2298/JSC0712281L . .

TY  - JOUR
AU  - Leovac, Vukadin M.
AU  - Novaković, Slađana B.
AU  - Bogdanović, Goran A.
AU  - Joksović, Milan D.
AU  - Szecsenyi, Katalin Meszaros
AU  - Češljević, Valerija I.
PY  - 2007
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3284
AB  - Synthesis of a new nickel(II) complex, [Ni(Ph(2)PzTSC-H)(2)] with 1,3-diphenylpyrazole-4-carboxaldehyde thiosemicarbazone (Ph(2)PzTSC), is described. The compounds have been characterized by elemental and thermal analysis, molar conductivity and spectral (UV-Vis, IR, H-1 NMR, and C-13 NMR) measurements. In the case of complex the magnetic measurement has been also performed. Crystal and molecular structures of both the free ligand and the complex have been determined by single crystal X-ray analysis. It was found that the ligand coordinates in a bidentate NS fashion, in its deprotonated thioenolato form. The cis-square-planar geometry of the complex is significantly distorted tetrahedrally. The Cambridge Structural Database (CSD) study has been performed to obtain geometrical and structural informations on similar nickel(II) complexes in order to compare structural data. (c) 2007 Elsevier Ltd. All rights reserved.
T2  - Polyhedron
T1  - Transition metal complexes with thiosemicarbazide-based ligands. Part LVI: Nickel(II) complex with 1,3-diphenylpyrazole-4-carboxaldehyde thiosemicarbazone and unusually deformed coordination geometry
VL  - 26
IS  - 14
SP  - 3783
EP  - 3792
DO  - 10.1016/j.poly.2007.04.012
ER  - 

@article{
author = "Leovac, Vukadin M. and Novaković, Slađana B. and Bogdanović, Goran A. and Joksović, Milan D. and Szecsenyi, Katalin Meszaros and Češljević, Valerija I.",
year = "2007",
abstract = "Synthesis of a new nickel(II) complex, [Ni(Ph(2)PzTSC-H)(2)] with 1,3-diphenylpyrazole-4-carboxaldehyde thiosemicarbazone (Ph(2)PzTSC), is described. The compounds have been characterized by elemental and thermal analysis, molar conductivity and spectral (UV-Vis, IR, H-1 NMR, and C-13 NMR) measurements. In the case of complex the magnetic measurement has been also performed. Crystal and molecular structures of both the free ligand and the complex have been determined by single crystal X-ray analysis. It was found that the ligand coordinates in a bidentate NS fashion, in its deprotonated thioenolato form. The cis-square-planar geometry of the complex is significantly distorted tetrahedrally. The Cambridge Structural Database (CSD) study has been performed to obtain geometrical and structural informations on similar nickel(II) complexes in order to compare structural data. (c) 2007 Elsevier Ltd. All rights reserved.",
journal = "Polyhedron",
title = "Transition metal complexes with thiosemicarbazide-based ligands. Part LVI: Nickel(II) complex with 1,3-diphenylpyrazole-4-carboxaldehyde thiosemicarbazone and unusually deformed coordination geometry",
volume = "26",
number = "14",
pages = "3783-3792",
doi = "10.1016/j.poly.2007.04.012"
}

Leovac, V. M., Novaković, S. B., Bogdanović, G. A., Joksović, M. D., Szecsenyi, K. M.,& Češljević, V. I.. (2007). Transition metal complexes with thiosemicarbazide-based ligands. Part LVI: Nickel(II) complex with 1,3-diphenylpyrazole-4-carboxaldehyde thiosemicarbazone and unusually deformed coordination geometry. in Polyhedron, 26(14), 3783-3792.
https://doi.org/10.1016/j.poly.2007.04.012

Leovac VM, Novaković SB, Bogdanović GA, Joksović MD, Szecsenyi KM, Češljević VI. Transition metal complexes with thiosemicarbazide-based ligands. Part LVI: Nickel(II) complex with 1,3-diphenylpyrazole-4-carboxaldehyde thiosemicarbazone and unusually deformed coordination geometry. in Polyhedron. 2007;26(14):3783-3792.
doi:10.1016/j.poly.2007.04.012 .

Leovac, Vukadin M., Novaković, Slađana B., Bogdanović, Goran A., Joksović, Milan D., Szecsenyi, Katalin Meszaros, Češljević, Valerija I., "Transition metal complexes with thiosemicarbazide-based ligands. Part LVI: Nickel(II) complex with 1,3-diphenylpyrazole-4-carboxaldehyde thiosemicarbazone and unusually deformed coordination geometry" in Polyhedron, 26, no. 14 (2007):3783-3792,
https://doi.org/10.1016/j.poly.2007.04.012 . .

TY  - JOUR
AU  - Kovacs, A
AU  - Nemcsok, D
AU  - Pokol, G
AU  - Szecsenyi, KM
AU  - Leovac, Vukadin M.
AU  - Jacimovic, ZK
AU  - Radosavjević Evans, Ivana
AU  - Howard, JAK
AU  - Tomić, Zoran D.
AU  - Giester, Gerald
PY  - 2005
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/2895
AB  - In the present paper we report the synthesis as well as the structural and vibrational characterisation of the HgL2Cl2 complex ( L = 3,5-dimethyl-1-thiocarboxamide). The crystal and molecular structures of both L and the HgL2Cl2 complex were determined by single-crystal X-ray diffraction. The coordination propensity of L to HgCl2 was explored by quantum chemical calculations. We found the preference of the monodentate coordination of L to HgCl2 through the sulfur atom ( instead of the pyridine nitrogen) to be in agreement with Pearsons acid - base character of the atoms involved and the steric effects. The vibrational properties of HgL2Cl2 were evaluated by a joint FT-IR and quantum chemical analysis. In addition, the thermal decomposition of the complex and ligand is reported.
T2  - New Journal of Chemistry
T1  - Structural, spectroscopic and computational studies of the HgL2Cl2 complex (L=3,5-dimethyl-1-thiocarboxamide pyrazole) and the crystal structure of L
VL  - 29
IS  - 6
SP  - 833
EP  - 840
DO  - 10.1039/b416816j
ER  - 

@article{
author = "Kovacs, A and Nemcsok, D and Pokol, G and Szecsenyi, KM and Leovac, Vukadin M. and Jacimovic, ZK and Radosavjević Evans, Ivana and Howard, JAK and Tomić, Zoran D. and Giester, Gerald",
year = "2005",
abstract = "In the present paper we report the synthesis as well as the structural and vibrational characterisation of the HgL2Cl2 complex ( L = 3,5-dimethyl-1-thiocarboxamide). The crystal and molecular structures of both L and the HgL2Cl2 complex were determined by single-crystal X-ray diffraction. The coordination propensity of L to HgCl2 was explored by quantum chemical calculations. We found the preference of the monodentate coordination of L to HgCl2 through the sulfur atom ( instead of the pyridine nitrogen) to be in agreement with Pearsons acid - base character of the atoms involved and the steric effects. The vibrational properties of HgL2Cl2 were evaluated by a joint FT-IR and quantum chemical analysis. In addition, the thermal decomposition of the complex and ligand is reported.",
journal = "New Journal of Chemistry",
title = "Structural, spectroscopic and computational studies of the HgL2Cl2 complex (L=3,5-dimethyl-1-thiocarboxamide pyrazole) and the crystal structure of L",
volume = "29",
number = "6",
pages = "833-840",
doi = "10.1039/b416816j"
}

Kovacs, A., Nemcsok, D., Pokol, G., Szecsenyi, K., Leovac, V. M., Jacimovic, Z., Radosavjević Evans, I., Howard, J., Tomić, Z. D.,& Giester, G.. (2005). Structural, spectroscopic and computational studies of the HgL2Cl2 complex (L=3,5-dimethyl-1-thiocarboxamide pyrazole) and the crystal structure of L. in New Journal of Chemistry, 29(6), 833-840.
https://doi.org/10.1039/b416816j

Kovacs A, Nemcsok D, Pokol G, Szecsenyi K, Leovac VM, Jacimovic Z, Radosavjević Evans I, Howard J, Tomić ZD, Giester G. Structural, spectroscopic and computational studies of the HgL2Cl2 complex (L=3,5-dimethyl-1-thiocarboxamide pyrazole) and the crystal structure of L. in New Journal of Chemistry. 2005;29(6):833-840.
doi:10.1039/b416816j .

Kovacs, A, Nemcsok, D, Pokol, G, Szecsenyi, KM, Leovac, Vukadin M., Jacimovic, ZK, Radosavjević Evans, Ivana, Howard, JAK, Tomić, Zoran D., Giester, Gerald, "Structural, spectroscopic and computational studies of the HgL2Cl2 complex (L=3,5-dimethyl-1-thiocarboxamide pyrazole) and the crystal structure of L" in New Journal of Chemistry, 29, no. 6 (2005):833-840,
https://doi.org/10.1039/b416816j . .

TY  - JOUR
AU  - Szecsenyi, KM
AU  - Leovac, Vukadin M.
AU  - Češljević, Valerija I.
AU  - Kovacs, A
AU  - Pokol, G
AU  - Argay, G
AU  - Kalman, A
AU  - Bogdanović, Goran A.
AU  - Jacimovic, ZK
AU  - Spasojević-de Bire, Anne
PY  - 2003
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/2672
AB  - Complex formation of copper(II) bromide and acetate with 1-carboxamide-3,5-dimethylpyrazole (HL3) and copper(II) bromide with 5-amino-4-carboxamide-1-phenylpyrazole (L-2), 4-acetyl-3-amino-5-methylpyrazole (HL4) and 1-carboxamidine-3,5-dimethylpyrazole (HL5), was studied. The obtained compounds, CuBr2(L-2)(2), Cu(L-3)(2), CuBr2(HL4)(2), CuBr2(HL5)(2) and [CuBr(HL1)(L-3)](2) (HL1 denotes the 3,5-dimethylpyrazole), are characterized by elemental analysis, FT-IR spectrometry, molar conductivity, TG-MS and DSC. The X-ray structure of [CuBr(HL1)(L-3)](2) and Cu(L-3)(2) is discussed. For [CuBr(HL1)(L-3)](2) a dimeric penta-co-ordinated structure has been found; the co-ordination around the metal in Cu(L-3)(2) is trans-square planar. To CuBr2(L-2)(2) and CuBr2(HL4)(2) a nearly tetrahedral, while for CuBr2(HL5)(2) an octahedral geometry may be assumed. It means that the geometry of the compounds in the first place depends on the ligand substituents. The course of the complex formation reaction is anion-dependent and may be explained on the basis of Pearsons theory, taking into account the steric factors. A low stability intermediate formation was observed in the thermal decomposition of Cu(L-3)(2). (C) 2003 Elsevier B.V. All rights reserved.
T2  - Inorganica Chimica Acta
T1  - Reaction of copper(II) with 1-carboxamide-3,5-dimethylpyrazole, 1-carboxamidine-3,5-dimethylpyrazole, 4-acetyl-3-amino-5-methylpyrazole and 5-amino-4-carboxamide-1-phenylpyrazole
VL  - 353
SP  - 253
EP  - 262
DO  - 10.1016/S0020-1693(03)00231-7
ER  - 

@article{
author = "Szecsenyi, KM and Leovac, Vukadin M. and Češljević, Valerija I. and Kovacs, A and Pokol, G and Argay, G and Kalman, A and Bogdanović, Goran A. and Jacimovic, ZK and Spasojević-de Bire, Anne",
year = "2003",
abstract = "Complex formation of copper(II) bromide and acetate with 1-carboxamide-3,5-dimethylpyrazole (HL3) and copper(II) bromide with 5-amino-4-carboxamide-1-phenylpyrazole (L-2), 4-acetyl-3-amino-5-methylpyrazole (HL4) and 1-carboxamidine-3,5-dimethylpyrazole (HL5), was studied. The obtained compounds, CuBr2(L-2)(2), Cu(L-3)(2), CuBr2(HL4)(2), CuBr2(HL5)(2) and [CuBr(HL1)(L-3)](2) (HL1 denotes the 3,5-dimethylpyrazole), are characterized by elemental analysis, FT-IR spectrometry, molar conductivity, TG-MS and DSC. The X-ray structure of [CuBr(HL1)(L-3)](2) and Cu(L-3)(2) is discussed. For [CuBr(HL1)(L-3)](2) a dimeric penta-co-ordinated structure has been found; the co-ordination around the metal in Cu(L-3)(2) is trans-square planar. To CuBr2(L-2)(2) and CuBr2(HL4)(2) a nearly tetrahedral, while for CuBr2(HL5)(2) an octahedral geometry may be assumed. It means that the geometry of the compounds in the first place depends on the ligand substituents. The course of the complex formation reaction is anion-dependent and may be explained on the basis of Pearsons theory, taking into account the steric factors. A low stability intermediate formation was observed in the thermal decomposition of Cu(L-3)(2). (C) 2003 Elsevier B.V. All rights reserved.",
journal = "Inorganica Chimica Acta",
title = "Reaction of copper(II) with 1-carboxamide-3,5-dimethylpyrazole, 1-carboxamidine-3,5-dimethylpyrazole, 4-acetyl-3-amino-5-methylpyrazole and 5-amino-4-carboxamide-1-phenylpyrazole",
volume = "353",
pages = "253-262",
doi = "10.1016/S0020-1693(03)00231-7"
}

Szecsenyi, K., Leovac, V. M., Češljević, V. I., Kovacs, A., Pokol, G., Argay, G., Kalman, A., Bogdanović, G. A., Jacimovic, Z.,& Spasojević-de Bire, A.. (2003). Reaction of copper(II) with 1-carboxamide-3,5-dimethylpyrazole, 1-carboxamidine-3,5-dimethylpyrazole, 4-acetyl-3-amino-5-methylpyrazole and 5-amino-4-carboxamide-1-phenylpyrazole. in Inorganica Chimica Acta, 353, 253-262.
https://doi.org/10.1016/S0020-1693(03)00231-7

Szecsenyi K, Leovac VM, Češljević VI, Kovacs A, Pokol G, Argay G, Kalman A, Bogdanović GA, Jacimovic Z, Spasojević-de Bire A. Reaction of copper(II) with 1-carboxamide-3,5-dimethylpyrazole, 1-carboxamidine-3,5-dimethylpyrazole, 4-acetyl-3-amino-5-methylpyrazole and 5-amino-4-carboxamide-1-phenylpyrazole. in Inorganica Chimica Acta. 2003;353:253-262.
doi:10.1016/S0020-1693(03)00231-7 .

Szecsenyi, KM, Leovac, Vukadin M., Češljević, Valerija I., Kovacs, A, Pokol, G, Argay, G, Kalman, A, Bogdanović, Goran A., Jacimovic, ZK, Spasojević-de Bire, Anne, "Reaction of copper(II) with 1-carboxamide-3,5-dimethylpyrazole, 1-carboxamidine-3,5-dimethylpyrazole, 4-acetyl-3-amino-5-methylpyrazole and 5-amino-4-carboxamide-1-phenylpyrazole" in Inorganica Chimica Acta, 353 (2003):253-262,
https://doi.org/10.1016/S0020-1693(03)00231-7 . .