TY  - JOUR
AU  - Hollo, Berta
AU  - Magyari, Jozsef
AU  - Ivkovic-Radovanovic, Vukosava
AU  - Vučković, Gordana
AU  - Tomić, Zoran D.
AU  - Szilagyi, Imre Miklos
AU  - Pokol, Gyorgy
AU  - Szecsenyi, Katalin Meszaros
PY  - 2014
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/100
AB  - Four new complex compounds of bis(phthalazine-1-hydrazone)-2,6-diacetylpyridine (Hz(2)DAP) ligand with Ni-II, Co-III, Cu-II and Zn-II metal centres were synthesised and characterised by single-crystal X-ray diffraction and IR spectral data. The antimicrobial activity of Hz(2)DAP and the obtained complexes [Co(Hz(2)DAP-H)Cl-2]center dot MeOH, [Ni(Hz(2)DAP-H)]Cl center dot MeOH, [Cu(Hz(2)DAP-H)Cl] and [Zn(Hz(2)DAP-2H)]center dot H2O were tested in vitro against selected Gram(-) and Gram(+) bacterial strains and fungi. The antimicrobial activity of the ligand is negligible, while its complexes with Ni-II, Co-III and Cu-II show considerable activity against Escherichia coli, Staphylococcus aureus and Micrococcus lysodeikticus. On the contrary, [Zn(Hz(2)DAP-2H)]center dot H2O promotes the growth of Candida albicans, while its antibacterial activity is negligible. On the basis of thermal data and those from coupled TG/MS measurements the decomposition mechanisms were determined and evaluated. (C) 2014 Elsevier Ltd. All rights reserved.
T2  - Polyhedron
T1  - Synthesis, characterisation and antimicrobial activity of bis(phthalazine-1-hydrazone)-2,6-diacetylpyridine and its complexes with Co-III, Ni-II, Cu-II and Zn-II
VL  - 80
IS  - SI
SP  - 142
EP  - 150
DO  - 10.1016/j.poly.2014.03.007
ER  - 

@article{
author = "Hollo, Berta and Magyari, Jozsef and Ivkovic-Radovanovic, Vukosava and Vučković, Gordana and Tomić, Zoran D. and Szilagyi, Imre Miklos and Pokol, Gyorgy and Szecsenyi, Katalin Meszaros",
year = "2014",
abstract = "Four new complex compounds of bis(phthalazine-1-hydrazone)-2,6-diacetylpyridine (Hz(2)DAP) ligand with Ni-II, Co-III, Cu-II and Zn-II metal centres were synthesised and characterised by single-crystal X-ray diffraction and IR spectral data. The antimicrobial activity of Hz(2)DAP and the obtained complexes [Co(Hz(2)DAP-H)Cl-2]center dot MeOH, [Ni(Hz(2)DAP-H)]Cl center dot MeOH, [Cu(Hz(2)DAP-H)Cl] and [Zn(Hz(2)DAP-2H)]center dot H2O were tested in vitro against selected Gram(-) and Gram(+) bacterial strains and fungi. The antimicrobial activity of the ligand is negligible, while its complexes with Ni-II, Co-III and Cu-II show considerable activity against Escherichia coli, Staphylococcus aureus and Micrococcus lysodeikticus. On the contrary, [Zn(Hz(2)DAP-2H)]center dot H2O promotes the growth of Candida albicans, while its antibacterial activity is negligible. On the basis of thermal data and those from coupled TG/MS measurements the decomposition mechanisms were determined and evaluated. (C) 2014 Elsevier Ltd. All rights reserved.",
journal = "Polyhedron",
title = "Synthesis, characterisation and antimicrobial activity of bis(phthalazine-1-hydrazone)-2,6-diacetylpyridine and its complexes with Co-III, Ni-II, Cu-II and Zn-II",
volume = "80",
number = "SI",
pages = "142-150",
doi = "10.1016/j.poly.2014.03.007"
}

Hollo, B., Magyari, J., Ivkovic-Radovanovic, V., Vučković, G., Tomić, Z. D., Szilagyi, I. M., Pokol, G.,& Szecsenyi, K. M.. (2014). Synthesis, characterisation and antimicrobial activity of bis(phthalazine-1-hydrazone)-2,6-diacetylpyridine and its complexes with Co-III, Ni-II, Cu-II and Zn-II. in Polyhedron, 80(SI), 142-150.
https://doi.org/10.1016/j.poly.2014.03.007

Hollo B, Magyari J, Ivkovic-Radovanovic V, Vučković G, Tomić ZD, Szilagyi IM, Pokol G, Szecsenyi KM. Synthesis, characterisation and antimicrobial activity of bis(phthalazine-1-hydrazone)-2,6-diacetylpyridine and its complexes with Co-III, Ni-II, Cu-II and Zn-II. in Polyhedron. 2014;80(SI):142-150.
doi:10.1016/j.poly.2014.03.007 .

Hollo, Berta, Magyari, Jozsef, Ivkovic-Radovanovic, Vukosava, Vučković, Gordana, Tomić, Zoran D., Szilagyi, Imre Miklos, Pokol, Gyorgy, Szecsenyi, Katalin Meszaros, "Synthesis, characterisation and antimicrobial activity of bis(phthalazine-1-hydrazone)-2,6-diacetylpyridine and its complexes with Co-III, Ni-II, Cu-II and Zn-II" in Polyhedron, 80, no. SI (2014):142-150,
https://doi.org/10.1016/j.poly.2014.03.007 . .

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  - 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 . .