2. Articole
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Item Synthesis and characterization of some new Cu(II), Ni(II) and Zn(II) complexes with salicylidene thiosemicarbazones: Antibacterial, antifungal and in vitro antileukemia activity [Articol](2013) Pahonțu, Elena; Fala, Valeriu; Gulea, Aurelian; Poirier, Donald; Țapcov, Victor; Roșu, TudorThirty two new Cu(II), Ni(II) and Zn(II) complexes (1-32) with salicylidene thiosemicarbazones (H2L1-H2L10) were synthesized. Salicylidene thiosemicarbazones, of general formula (X)N-NH-C(S)-NH(Y), were prepared through the condensation reaction of 2-hydroxybenzaldehyde and its derivatives (X) with thiosemicarbazide or 4-phenylthiosemicarbazide (Y = H, C6H5). The characterization of the new formed compounds was done by 1H-NMR, 13C-NMR, IR spectroscopy, elemental analysis, magnetochemical, thermoanalytical and molar conductance measurements. In addition, the structure of the complex 5 has been determined by X-ray diffraction method. All ligands and metal complexes were tested as inhibitors of human leukemia (HL-60) cells growth and antibacterial and antifungal activities.Item Copper(II) coordination compounds with 2-acetylpyridine N4-(bicyclo[2.2.1]heptan-2-yl)thiosemicarbazone as potential antibacterial agents [Articol](CEP USM, 2023) Graur, Vasilii; Graur, Ianina; Gulea, Aurelian; Teleucă, Iulia; Lozan-Tîrșu, Carolina; Bălan, GretaThe paper presents the synthesis of the new 2-acetylpyridine N4-(bicyclo[2.2.1]hept-2-yl)thiosemicarbazone (HL) and its three copper(II) coordination compounds: [Cu(L)X] (X = NO3- (I), Cl- (II), CHCl2COO- (III)). The obtained compounds were studied by NMR and FTIR spectroscopies, elemental analysis, and molar electric conductibility. The antibacterial activity towards Gram-positive (Staphylococcus aureus, Bacillus cereus) and Gram-negative (Escherichia coli, Acinetobacter baumannii) standard strains was studied for the HL and complexes I-III. The coordination of the HL to the copper(II) atom leads to the increase of activity against almost all microorganisms. Complex I is the most active one towards Gram-positive microorganisms, while complex III is the most active one towards Gram-negative microorganisms. They in many cases surpass the activity of Furacillinum and are practically on the same level as Tetracycline towards Gram-positive microorganisms.Item Copper complexes with N4(2-ethyl benzoate) thiosemicarbazone of 2-acetylpyridine [Articol](CEP USM, 2022-09-29) Rusnac, Anna; Garbuz, Olga; Șova, Sergiu; Gulea, AurelianItem Synthesis, characterization, antioxidant activity evaluation of 3d metals complexes with N(4)-((3)-ethyl benzoate) thiosemicarbazones of 2-formyl(2-acetyl, 2-benzoil)pyridine [Articol](CEP USM, 2022) Rusnac, Anna; Garbuz, Olga; Shova, Sergiu; Gulea, AurelianThe paper presents the synthesis of new coordination compounds of Cu(II), Mn(II), Fe(III) Co(III), Ni(II) and Zn(II) with N(4)-((3)-ethyl benzoate)thiosemicarbazones of 2-formyl pyridine derivatives obtained through the condensation of N(4)-((m)-ethyl benzoate) thiosemicarbazide with 2-pyridinecarboxaldehyde, 2-acetylpyridine and 2-benzoylpyridine. The characterization of new compounds was done by 1H NMR, 13C NMR, IR spectroscopy, conductivity and elemental analysis. In addition, the structures of the ligands (HL1,3) were determined by single-crystal X-ray diffraction. The effect of these complexes on antioxidant activity were studied and compared with those of free ligands. The best result was found to be on coordination compound [Zn(L1)Cl], with IC50 = 11.45 μM, it is better than the free ligand HL1, IC50 = 13.15 μM and is better than the substance Trolox, IC50 = 15.86 μM (it is a pronounced antioxidant taken as a control substance).Item Copper(II) coordination compounds with thiosemicarbazide derivatives as inhibitors of superoxide radicals [Articol](Marina Sokolova Publishings, 2022) Gulea, Aurelian; Tsapkov, Victor; Graur, Vasilii; Pantea, Valeriana; Andronache, Lilia; Shvets, I.; Matusovsky, V.; Lisii, D.; Botnaru, M.; Gudumac, ValentinNew biologically active coordination compounds of copper(II) based on substituted 3-(phenyl)-1-(pyridin-2-yl)prop-2-en- 1-one 4-allylthiosemicarbazones have been obtained. It was found that these compounds exhibit strong antiradical properties when interacting with a superoxide radical. Due to this property, the obtained compounds can find wide application in medicine as inhibitors of superoxide radicals in the human body, thus preventing damage of cells and tissues, multifactorial diseases, including carcinogenesis. The synthesized coordination compounds expand the arsenal of superoxide radical inhibitors with high biological activity. Their possible significance for the development of new treatment strategies for diseases associated with the overproduction of superoxide radicals discussed.Item Sinteza combinațiilor coordinative cu unele metale 3d în baza N(4)-(4-benzoat de etil) tiosemicarbazone ale derivaților aldehidei salicilice. proprietăți antimicrobiene, antifungice și antioxidative [Articol](CEP USM, 2021) Rusnac, Anna; Țurcanu, Nina; Burduniuc, Olga; Balan, Greta; Garbuz, Olga; Gulea, AurelianÎn lucrare este descrisă sinteza a 4 substanțe organice noi N(4)-(4-benzoat de etil) tiosemicarbazone ale derivaților aldehidei salicilice și a 29 combinații coordinative ale Cu(II), Ni(II), Zn(II) și Co(III). Structurile substanțelor sintetizate au fost confirmate cu ajutorul spectroscopiei IR și RMN, analizei elementale, magnetochimiei și, în cazul [Ni(L2) DMF]·DMF, difracției cu raze X. Studiul activității antimicrobiene s-a dovedit a fi în limita concentrației 0,125-0,500 mg/mL, iar activitate antifungică a înregistrat cel mai bun rezultat pe Cryptococcus neoformans la complexul {Ni(HL1)Cl}•C2H5OH•3H2O, unde CMI=0,016 mg/mL, fiind mai activ decât substanța martor Nistatina. Cele mai bune rezultate ale testului ABTS au fost înregistrate la ligandul H2L3(7) și la complexul {Ni(HL3) NO3}•H2O (7.8), care la concentrația 100 µM inhibă 54,4% din radicali ABTS•+.Item Sinteza unor derivați ai 1,2,4-triazolului în baza n-[4-(3-metil-5-sulfanil-4h-1,2,4-triazol-4-il)fenil]acetamidei [Articol](CEP USM, 2018) Rusnac, Roman; Garbuz, Olga; Barbă, Nicanor; Gulea, Aurelian; Bălan, Greta; Bruduniuc, OlgaÎn articol sunt descrise metodele de sinteză a 8 compuși organici din seria 1,2,4-triazol-3-tiolilor, dintre care 7 compuși sunt noi, a căror structură a fost confirmată prin sinteză și cu ajutorul metodelor spectrale: 1H-RMN, 13C-RMN și IR (FTIR). Compușii (2) și (3) au fost investigați cu ajutorul difracției razelor X pe monocristal. Unii compuși obținuți au demonstrat proprietăți antiproliferative moderate: inhibă creșterea celulelor de HEp-2 și BxPC-3. Activitate antifungică au demonstrat compușii (2) și (7), cu o valoare a CMI de 0,125 μg/mL. Proprietățile antioxidative au fost studiate cu ajutorul metodei ABTS și DPPH; astfel, cel mai bun atioxidant s-a dovedit a fi 2-[(2-hidroxifenil)metiliden]-N-[4-(3-metil-5-sulfanil-4H-1,2,4-triazol-4-il)fenil]hidrazin-1-carbotioamida (7).Item Sinteza și studiul proprietăților antioxidative ale unor noi derivați ai benzoxazolilor [Articol](CEP USM, 2018) Rusnac, Anna; Rusnac, Roman; Garbuz, Olga; Barbă, Nicanor; Gulea, AurelianÎn lucrare este descrisă sinteza a 4 derivați noi ai benzoxazolilor care manifestă proprietăți biologice. A fost stabilită structura compușilor sintetizați cu ajutorul spectroscopiei 1H,13C-RMN, IR, iar pentru N-[2-(dimetilamino)-1,3-benzoxazol-5-il]-2-[1-(piridin-2-il)etiliden]hidrazin-1-carbotioamidă structura a fost stabilită cu ajutorul difracției cu raze X pe monocristal. Au fost studiate și proprietățile antioxidative ale acestora cu aplicarea metodelor ABTS și DPPH.Item Complexes of 3dn Metal Ions with Thiosemicarbazones: Synthesis and Antimicrobial Activity [Articol](MDPI AG, 2007) Rosu, Tudor; Gulea, Aurelian; Nicolae, Anca; Georgescu, RodicaThe chelating behavior of the thiosemicarbazone derivatives of 2-hydroxy-8-R-tricyclo[7.3.1.0.2,7]tridecane-13-one (where R = H, CH3, C6H5) towards Co(II), Ni(II) and Cu(II) has been investigated by elemental analysis, molar conductivity measurements, UV-VIS, IR, ESR spectroscopy and thermal studies. It was deduced from the experiments performed that the ligands coordinate to metal ions in different ways – neutral bidentate or mononegative bidentate – depending on the nature of R. Also, if metal acetates are used instead of metal chlorides, the ligands coordinate in a mononegative bidentate fashion, regardless of the nature of R or the thiosemicarbazone type ligand. The antimicrobial activity of the ligands and of the complexes towards samples of Acinetobacter boumanii, Klebsiella pneumoniae, Escherichia coli, Staphylococcus aureus and Pseudomonas aeruginosa was determined.Item Synthesis and characterization of some new Cu(II), Ni(II) and Zn(II) complexes with salicylidene thiosemicarbazones:antibacterial, antifungal and in vitro antileukemia activity [Articol](Molecular Diversity Preservation International (MDPI), 2013) Pahonțu, Elena; Fala, Valeriu; Gulea, Aurelian; Poirier, Donald; Tapcov, Victor; Rosu, TudorThirty two new Cu(II), Ni(II) and Zn(II) complexes (1–32) with salicylidene thiosemicarbazones (H2L1–H2L10) were synthesized. Salicylidene thiosemicarbazones, of general formula (X)N-NH-C(S)-NH(Y), were prepared through the condensation reaction of 2-hydroxybenzaldehyde and its derivatives (X) with thiosemicarbazide or 4-phenylthiosemicarbazide (Y = H, C6H5). The characterization of the new formed compounds was done by 1H-NMR, 13C-NMR, IR spectroscopy, elemental analysis, magnetochemical, thermoanalytical and molar conductance measurements. In addition, the structure of the complex 5 has been determined by X-ray diffraction method. All ligands and metal complexes were tested as inhibitors of human leukemia (HL-60) cells growth and antibacterial and antifungal activities.