Browsing by Author "Pahontu, Elena"

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    Novel 2‐formylpyridine 4‐allyl‐S‐methylisothiosemicarbazone and Zn(II), Cu(II), Ni(II) and Co(III) complexes: Synthesis, characterization, crystal structure, antioxidant, antimicrobial and antiproliferative activity [Articol]
    (John Wiley & Sons Ltd, 2020) Balan, Greta; Burduniuc, Olga; Usataia, Irina; Graur, Vasilii; Chumakov, Yurii; Petrenko, Peter; Gudumac, Valentin; Gulea, Aurelian; Pahontu, Elena
    New zinc (II), copper (II), nickel (II) and cobalt (III) complexes, [Zn (HL) 2 ]I 2(1), [Cu (HL)Cl2 ](2), [Cu (HL)Br2](3), [Cu (HL)(H2O)2](ClO4)2(4), [Ni (HL)2]I2H2O(5), [Co(L)2]Cl (6), [Co(L)2]NO3(7), [Co(L)2]I[Co(L)2](I3) (8) were obtained with 2-formylpyridine 4-allyl-Smethylisothiosemicarbazone (HL). The isothiosemicarbazone ligand was characterized by NMR (1H and13C), IR spectroscopy and X-ray diffraction. All the complexes were characterized by elemental analysis, IR, UV–Vis, ESI-MS spectroscopy, molar conductivity, magnetic susceptibility measurements. X-ray diffraction analysis on the monocrystal and powder elucidated the structure of the complexes 1,5, 7and 8. The ligand and the complexes were tested for their antioxidant and antimi-crobial activity against Staphylococcus aureus,Escherichia coli,Klebsiella pneumoniae and Candida albicans. Also, the antiproliferative properties of these compounds on human leukemia HL-60, human cervical epithelial HeLa, human epithelial pancreatic adenocarcinoma BxPC-3, human muscle rhabdomyosarcoma spindle, large multinucleated RD cells and normal MDCK cells have been investigated. The nickel complex 5and cobalt complexes 6,7showed promising antiproliferative activity and low toxicity
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    Sulfanilamide copper(II) chelates with 2-[(2-Hydroxyphenyl-imino)methyl] phenolom and 1-[(2-Hydroxyphenylimino)-methyl]naphthalen-2-ol [Articol]
    (2010) Gulea, Aurelian; Țapcov, Victor; Poirier, Donald; Aruxandei, C.; Pahontu, Elena
    2-[(2-Hydroxyphenylimino)methyl]phenol (H2L1) and 1-[(2-hydroxyphenylimino)methyl]naphthalen- 2-ol (H2L2) reacted with copper(II) acetate hydrate and sulfanilamide (Sf1), sulfathiazole (Sf2), sulfaethidole (Sf3), sulfadiazine (Sf4), and sulfadimidine (Sf5) in ethanol to give mixed-ligand copper chelates with the composition Cu(Sf1-5)(L 1-2) . nH2O (n = 1, 2). All these complexes are monomeric. Salicylaldehyde imines (H2L1 and H2L 2) behave as doubly deprotonated tridentate O,N,O ligands, whereas sulfanilamides (Sf1-5) are unidentate ligands. Thermolysis of the synthesized complexes includes dehydration at 70-90°C, followed by complete thermal decomposition (290-380°C). The complexes [Cu(Sf1)(L 1)] . 2H2O and [Cu(Sf3)(L1)] . H2O at a concentration of 10-4 M inhibited growth and reproduction of 100% of human myeloid leukemia cells (HL-60). The inhibitory effect was 90 and 75%, respectively, at a concentration of 10-5 M, whereas no antitumor activity was observed at a concentration of 10-6 M.
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    Synthesis and antileukaemia activity of n-(2,4-dimethylphenyl) hydrazinecarbothioamide and its azomethine derviatives [Articol]
    (Academia de Ştiinţe a Moldovei, 2017) Erhan, Tatiana; Jalba, Svetlana; Sargun, Artur; Barba, Alic; Poirier, Donald; Gulea, Aurelian; Pahontu, Elena
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    Synthesis, characterization and toxicity evaluation of Cu(II), Mn(II), Co(II), Ni(II), Pd(II) complexes with ligand derived from hydrazinecarbothioamide [Articol]
    (2018) Pahontu, Elena; Socea, Laura Ileana; Barbuceanu, Ștefania Felicia; Ilieș, Diana Carolina; Badea, Mihaela; Olaru, Octavian Tudorel; Gulea, Aurelian; Socea, Bogdan; Bratu, Ovidiu
    New copper(II), manganese(II), cobalt(II), nickel(II) and palladium(II) complexes, [Cu(L)(X)(H2O)] [X= OAc- (1), Cl- (3), ClO4 - (4)], [M(L)2(H2O)2] [M= Cu2+(2), Mn2+(5)], [M(L)(OAc)(H2O)] [M= Co2+(6), Pd2+(8)], [Ni(L)(OAc)] (7) were synthesized with 2-(5H-dibenzo [a,d][7] annulen-5-ylacetyl)-N-(4-chlorophenyl) hydrazinecarbothioamide (HL). All the metal complexes have been characterized by different physico-chemical techniques like molar conductivity, magnetic susceptibility measurements, electronic and infrared spectral studies, elemental and thermal analysis. The toxicity of newly synthesized compounds was evaluated using the Daphnia magna bioassay.