TY  - JOUR
AU  - Jaćimović, Željko K.
AU  - Giester, Gerald
AU  - Kosović, Milica
AU  - Bogdanović, Goran A.
AU  - Novaković, Slađana B.
AU  - Leovac, Vukadin M.
AU  - Latinović, Nedeljko
AU  - Hollo, Berta Barta
AU  - Szecsenyi, Katalin Meszaros
PY  - 2017
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1428
AB  - New nickel(II) and copper(II) coordination compounds were synthesized by the reaction of N-(benzyloxycarbonyl)-1H-pyrazole-1-carboxamidine ligand (HL) with Ni(II) and Cu(II) acetate in methanolic solution. The crystal and molecular structures of the complexes as well as those of the ligand were determined by single-crystal X-ray structure analysis. The octahedral surrounding around the metal centers in the isostructural complexes [ML2(MeOH)(2)], M = Ni(II), Cu(II), MeOH = methanol, is established by the bidentate coordination of two ligand molecules through the pyrazole nitrogen and the deprotonated nitrogen atom of the carboxamidine group along with the oxygen atoms from two MeOH molecules. Despite that the molecular structure of the complexes was determined by X-ray structure analysis, in the FT-IR spectra of the compounds the characteristic bands for MeOH were missing. By coupled TG-MS measurements, it was found that compounds during the transport and storage exchanged MeOH by water molecules. The amount of the water was calculated on the basis of thermogravimetric data. The antifungal activity of the compounds was tested against fungi Ph. viticola and B. dothidea and compared to that of a commercial fungicide. Depending on the fungi and on the structure, the compounds showed different, but somewhat lower activity than the commercial fungicide.
T2  - Journal of Thermal Analysis and Calorimetry
T1  - Pyrazole-type complexes with Ni(II) and Cu(II) Solvent exchange reactions in coordination compounds
VL  - 127
IS  - 2
SP  - 1501
EP  - 1509
DO  - 10.1007/s10973-016-5549-9
ER  - 

@article{
author = "Jaćimović, Željko K. and Giester, Gerald and Kosović, Milica and Bogdanović, Goran A. and Novaković, Slađana B. and Leovac, Vukadin M. and Latinović, Nedeljko and Hollo, Berta Barta and Szecsenyi, Katalin Meszaros",
year = "2017",
abstract = "New nickel(II) and copper(II) coordination compounds were synthesized by the reaction of N-(benzyloxycarbonyl)-1H-pyrazole-1-carboxamidine ligand (HL) with Ni(II) and Cu(II) acetate in methanolic solution. The crystal and molecular structures of the complexes as well as those of the ligand were determined by single-crystal X-ray structure analysis. The octahedral surrounding around the metal centers in the isostructural complexes [ML2(MeOH)(2)], M = Ni(II), Cu(II), MeOH = methanol, is established by the bidentate coordination of two ligand molecules through the pyrazole nitrogen and the deprotonated nitrogen atom of the carboxamidine group along with the oxygen atoms from two MeOH molecules. Despite that the molecular structure of the complexes was determined by X-ray structure analysis, in the FT-IR spectra of the compounds the characteristic bands for MeOH were missing. By coupled TG-MS measurements, it was found that compounds during the transport and storage exchanged MeOH by water molecules. The amount of the water was calculated on the basis of thermogravimetric data. The antifungal activity of the compounds was tested against fungi Ph. viticola and B. dothidea and compared to that of a commercial fungicide. Depending on the fungi and on the structure, the compounds showed different, but somewhat lower activity than the commercial fungicide.",
journal = "Journal of Thermal Analysis and Calorimetry",
title = "Pyrazole-type complexes with Ni(II) and Cu(II) Solvent exchange reactions in coordination compounds",
volume = "127",
number = "2",
pages = "1501-1509",
doi = "10.1007/s10973-016-5549-9"
}

Jaćimović, Ž. K., Giester, G., Kosović, M., Bogdanović, G. A., Novaković, S. B., Leovac, V. M., Latinović, N., Hollo, B. B.,& Szecsenyi, K. M.. (2017). Pyrazole-type complexes with Ni(II) and Cu(II) Solvent exchange reactions in coordination compounds. in Journal of Thermal Analysis and Calorimetry, 127(2), 1501-1509.
https://doi.org/10.1007/s10973-016-5549-9

Jaćimović ŽK, Giester G, Kosović M, Bogdanović GA, Novaković SB, Leovac VM, Latinović N, Hollo BB, Szecsenyi KM. Pyrazole-type complexes with Ni(II) and Cu(II) Solvent exchange reactions in coordination compounds. in Journal of Thermal Analysis and Calorimetry. 2017;127(2):1501-1509.
doi:10.1007/s10973-016-5549-9 .

Jaćimović, Željko K., Giester, Gerald, Kosović, Milica, Bogdanović, Goran A., Novaković, Slađana B., Leovac, Vukadin M., Latinović, Nedeljko, Hollo, Berta Barta, Szecsenyi, Katalin Meszaros, "Pyrazole-type complexes with Ni(II) and Cu(II) Solvent exchange reactions in coordination compounds" in Journal of Thermal Analysis and Calorimetry, 127, no. 2 (2017):1501-1509,
https://doi.org/10.1007/s10973-016-5549-9 . .

TY  - JOUR
AU  - Petrović, Đorđe
AU  - Jakovljević, Ivan
AU  - Joksović, Ljubinka G.
AU  - Szecsenyi, Katalin Meszaros
AU  - Durdevic, Predrag
PY  - 2016
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/276
AB  - Hydrolysis reactions of YCl3 aqueous solutions were studied by potentiometric titrations at 310 K in the pH range ca.3-9 and total Y3+ ion concentration range 0.5-10.0 mmol/dm(3). The experimental data were evaluated with the aid of the Hyperquad2006 suite of programs, which indicated the formation of the following hydrolytic complexes (log conc. overall stability constants beta(p,q) defined as beta(p,q) = M-p(OH)(q)[H](q)/[M](p)), Y(OH)(2+) (-7.71(2)); Y(OH)(2)(+) (-16.42(2)); Y(OH)(3) (-26.01(3)); Y-2(OH)(2)(4+) (-14.23(4)); Y-3(OH)(5)(2+) (-34.20 (4)); Y-4(OH)(6)(2+) (-37.10(5)). The hydrolysis of the Y3+ ion was also monitored by electrospray ionization ion-trap mass spectrometry (ESI-MS) in the pH range 2.63-7.10. The influence of the sample cone voltage on the product distribution was significant, indicating the contribution of ion source fragmentation reactions. The optimal cone voltage was set to 70 V for cationic and 100 V for anionic spectra. The cationic and anionic ESI mass spectra of the Y3+ solutions produced strong evidence for the presence of a variety of monomeric and polymeric hydrolytic complexes. The Cl- ion appeared to be a strong competitor to the OH- ion for the oxo-yttrium core. The hydrolytic precipitation reactions with NaOH or urea as precipitating agents were studied. The obtained precipitates were characterized by the potentiometric technique, elemental analysis, thermal analysis (TG-DSC), infrared spectroscopy, X-ray diffractions and the SEM technique. Hydrothermal synthesis of the precipitate in an autoclave at T= 420 K and P = 10 bar with NaOH as the precipitating agent produced a crystalline precipitate in the form of hexagonal needles (P6(3)/m space group). At atmospheric pressure only an amorphous precipitate was produced with both precipitating agents. The concentration solubility product K-so* of Y(OH)(3) was evaluated from the potentiometric titrations curves and logK(so)* = -22.85(4). The synthesized precipitate with NaOH as a precipitating agent had a composition of Y(OH)(3)center dot 2H(2)O, while the amorphous precipitate obtained with urea had a composition of Y-2(OH)(2)(CO3)(2)center dot 3H(2)O. (C) 2015 Elsevier Ltd. All rights reserved.
T2  - Polyhedron
T1  - Study of the hydrolytic properties of the trivalent Y-ion in chloride medium
VL  - 105
SP  - 1
EP  - 11
DO  - 10.1016/j.poly.2015.11.047
ER  - 

@article{
author = "Petrović, Đorđe and Jakovljević, Ivan and Joksović, Ljubinka G. and Szecsenyi, Katalin Meszaros and Durdevic, Predrag",
year = "2016",
abstract = "Hydrolysis reactions of YCl3 aqueous solutions were studied by potentiometric titrations at 310 K in the pH range ca.3-9 and total Y3+ ion concentration range 0.5-10.0 mmol/dm(3). The experimental data were evaluated with the aid of the Hyperquad2006 suite of programs, which indicated the formation of the following hydrolytic complexes (log conc. overall stability constants beta(p,q) defined as beta(p,q) = M-p(OH)(q)[H](q)/[M](p)), Y(OH)(2+) (-7.71(2)); Y(OH)(2)(+) (-16.42(2)); Y(OH)(3) (-26.01(3)); Y-2(OH)(2)(4+) (-14.23(4)); Y-3(OH)(5)(2+) (-34.20 (4)); Y-4(OH)(6)(2+) (-37.10(5)). The hydrolysis of the Y3+ ion was also monitored by electrospray ionization ion-trap mass spectrometry (ESI-MS) in the pH range 2.63-7.10. The influence of the sample cone voltage on the product distribution was significant, indicating the contribution of ion source fragmentation reactions. The optimal cone voltage was set to 70 V for cationic and 100 V for anionic spectra. The cationic and anionic ESI mass spectra of the Y3+ solutions produced strong evidence for the presence of a variety of monomeric and polymeric hydrolytic complexes. The Cl- ion appeared to be a strong competitor to the OH- ion for the oxo-yttrium core. The hydrolytic precipitation reactions with NaOH or urea as precipitating agents were studied. The obtained precipitates were characterized by the potentiometric technique, elemental analysis, thermal analysis (TG-DSC), infrared spectroscopy, X-ray diffractions and the SEM technique. Hydrothermal synthesis of the precipitate in an autoclave at T= 420 K and P = 10 bar with NaOH as the precipitating agent produced a crystalline precipitate in the form of hexagonal needles (P6(3)/m space group). At atmospheric pressure only an amorphous precipitate was produced with both precipitating agents. The concentration solubility product K-so* of Y(OH)(3) was evaluated from the potentiometric titrations curves and logK(so)* = -22.85(4). The synthesized precipitate with NaOH as a precipitating agent had a composition of Y(OH)(3)center dot 2H(2)O, while the amorphous precipitate obtained with urea had a composition of Y-2(OH)(2)(CO3)(2)center dot 3H(2)O. (C) 2015 Elsevier Ltd. All rights reserved.",
journal = "Polyhedron",
title = "Study of the hydrolytic properties of the trivalent Y-ion in chloride medium",
volume = "105",
pages = "1-11",
doi = "10.1016/j.poly.2015.11.047"
}

Petrović, Đ., Jakovljević, I., Joksović, L. G., Szecsenyi, K. M.,& Durdevic, P.. (2016). Study of the hydrolytic properties of the trivalent Y-ion in chloride medium. in Polyhedron, 105, 1-11.
https://doi.org/10.1016/j.poly.2015.11.047

Petrović Đ, Jakovljević I, Joksović LG, Szecsenyi KM, Durdevic P. Study of the hydrolytic properties of the trivalent Y-ion in chloride medium. in Polyhedron. 2016;105:1-11.
doi:10.1016/j.poly.2015.11.047 .

Petrović, Đorđe, Jakovljević, Ivan, Joksović, Ljubinka G., Szecsenyi, Katalin Meszaros, Durdevic, Predrag, "Study of the hydrolytic properties of the trivalent Y-ion in chloride medium" in Polyhedron, 105 (2016):1-11,
https://doi.org/10.1016/j.poly.2015.11.047 . .

TY  - JOUR
AU  - Hollo, Berta Barta
AU  - Szecsenyi, Katalin Meszaros
AU  - Deli, Maria
AU  - Kiss, Lorand
AU  - Kallay-Menyhard, Alfred
AU  - Zivkovic-Radovanovic, Vukosava
AU  - Tomić, Zoran D.
PY  - 2016
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1184
AB  - Synthetic paths toward the two polymorphs of a monohydrate, one anhydrous polymorph of 1-carboxamidino-5-hydroxy-3-methylpyrazole (hcmp) and two polymorphs of zinc complexes containing hcmp ligand are presented. By choosing ions which are not part of the final product, it is possible to direct the synthesis toward the particular polymorph. In all three modifications of hcmp, the same hydrogen bonding motif appears, leading to formation of similar molecular chains. Differences arise due to different modes of chain aggregation and the presence of solvent water. Analysis of the crystal packing and the energetic features of hcmp polymorphs is made using the PIXEL model. The thermal decomposition processes are examined using differential scanning calorimetry and thermogravimetry. Analysis of crystal packing in the two polymorphs of zinc complex suggests the key role of the hydrogen bonding capacity of the aqua ligand for the appearance of the two polymorphic forms. In both polymorphs of zinc complex, stacking interactions have an important role. However, the enhanced hydrogen bonding capacity of the aqua ligand influences the formation of multistacking arrangement.
T2  - Structural Chemistry
T1  - Anion-/cation-directed reaction routes to polymorphic forms of a pyrazole-type ligand and its coordination compounds with zinc. Key structural differences between polymorphs
VL  - 27
IS  - 4
SP  - 1121
EP  - 1133
DO  - 10.1007/s11224-015-0734-1
ER  - 

@article{
author = "Hollo, Berta Barta and Szecsenyi, Katalin Meszaros and Deli, Maria and Kiss, Lorand and Kallay-Menyhard, Alfred and Zivkovic-Radovanovic, Vukosava and Tomić, Zoran D.",
year = "2016",
abstract = "Synthetic paths toward the two polymorphs of a monohydrate, one anhydrous polymorph of 1-carboxamidino-5-hydroxy-3-methylpyrazole (hcmp) and two polymorphs of zinc complexes containing hcmp ligand are presented. By choosing ions which are not part of the final product, it is possible to direct the synthesis toward the particular polymorph. In all three modifications of hcmp, the same hydrogen bonding motif appears, leading to formation of similar molecular chains. Differences arise due to different modes of chain aggregation and the presence of solvent water. Analysis of the crystal packing and the energetic features of hcmp polymorphs is made using the PIXEL model. The thermal decomposition processes are examined using differential scanning calorimetry and thermogravimetry. Analysis of crystal packing in the two polymorphs of zinc complex suggests the key role of the hydrogen bonding capacity of the aqua ligand for the appearance of the two polymorphic forms. In both polymorphs of zinc complex, stacking interactions have an important role. However, the enhanced hydrogen bonding capacity of the aqua ligand influences the formation of multistacking arrangement.",
journal = "Structural Chemistry",
title = "Anion-/cation-directed reaction routes to polymorphic forms of a pyrazole-type ligand and its coordination compounds with zinc. Key structural differences between polymorphs",
volume = "27",
number = "4",
pages = "1121-1133",
doi = "10.1007/s11224-015-0734-1"
}

Hollo, B. B., Szecsenyi, K. M., Deli, M., Kiss, L., Kallay-Menyhard, A., Zivkovic-Radovanovic, V.,& Tomić, Z. D.. (2016). Anion-/cation-directed reaction routes to polymorphic forms of a pyrazole-type ligand and its coordination compounds with zinc. Key structural differences between polymorphs. in Structural Chemistry, 27(4), 1121-1133.
https://doi.org/10.1007/s11224-015-0734-1

Hollo BB, Szecsenyi KM, Deli M, Kiss L, Kallay-Menyhard A, Zivkovic-Radovanovic V, Tomić ZD. Anion-/cation-directed reaction routes to polymorphic forms of a pyrazole-type ligand and its coordination compounds with zinc. Key structural differences between polymorphs. in Structural Chemistry. 2016;27(4):1121-1133.
doi:10.1007/s11224-015-0734-1 .

Hollo, Berta Barta, Szecsenyi, Katalin Meszaros, Deli, Maria, Kiss, Lorand, Kallay-Menyhard, Alfred, Zivkovic-Radovanovic, Vukosava, Tomić, Zoran D., "Anion-/cation-directed reaction routes to polymorphic forms of a pyrazole-type ligand and its coordination compounds with zinc. Key structural differences between polymorphs" in Structural Chemistry, 27, no. 4 (2016):1121-1133,
https://doi.org/10.1007/s11224-015-0734-1 . .

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 . .