İbrahim İlker ÖZYİĞİT

Article | 2020 | Turkish Journal of Chemistry44 ( 4 )

The objective of this study is to synthesize ZnO and Mg doped ZnO (Zn1-xMgxO) nanoparticles via the sol-gel method, and characterize their structures and to investigate their biological properties such as antibacterial activity and hemolytic potential.Nanoparticles (NPs) were synthesized by the sol-gel method using zinc acetate dihydrate (Zn(CH3COO)(2) .2H(2)O) and magnesium acetate tetrahydrate (Mg(CH3COO)(2) .4H(2)O) as precursors. Methanol and monoethanolamine were used as solvent and sol stabilizer, respectively. Structural and morphological characterizations of Zn1-xMgxO nanoparticles were studied by using XRD and SEM-EDX, resp . . .ectively. Photocatalytic activities of ZnO and selected Mg-doped ZnO (Zn1-xMgxO) nanoparticles were investigated by degradation of methylene blue (MeB). Results indicated that Mg doping (both 10?nd 30?to the ZnO nanoparticles enhanced the photocatalytic activity and a little amount of Zn0.90Mg0.10O photocatalyst (1.0 mg/mL) degraded MeB with 99?fficiency after 24 h of irradiation under ambient visible light. Antibacterial activity of nanoparticles versus Escherichia coli (E. coli) was determined by the standard plate count method. Hemolytic activities of the NPs were studied by hemolysis tests using human erythrocytes. XRD data proved that the average particle size of nanoparticles was around 30 nm. Moreover, the XRD results indicated that the patterns of Mg doped ZnO nanoparticles related to ZnO hexagonal wurtzite structure had no secondary phase for x More less

Ali Osman SOLAK

Article | 2012 | Turkish Journal of Chemistry36 ( 1 )

The reaction of N-(4-aminophenyl)aza-15-crown-5 (1) with anti-chlorophenylglyoxime (2) produces a novel azacrown ether containing vic-dioxime, N-(4-aminophenyl)aza-15-crown-5-phenylglyoxime (LH_2). LH_2 reacts with Ni(II), Cu(II), Co(II), Cd(II), and Zn(II) ions to yield the mononuclear transition and nontransition metal complexes [M(LH)_2] (M = Ni and Cu), [M(LH)_2(H_2O)_2] (M = Co), and [M(LH)(H_2O)(Cl)] (M = Cd and Zn). The structural features of LH_2 were studied using several techniques including elemental analysis, Fourier transform infrared spectroscopy (FT-IR), ultraviolet visible (UV-Vis), mass spectrometry (MS), 1-dimensi . . .onal (1D) ^1H-NMR and ^{13}CNMR, distortionless enhancement by polarization transfer (DEPT) 2-dimensional (2D) heteronuclear single-quantum coherence (HSQC), and heteronuclear multiple-bond correlation (HMBC) techniques. The structures of the complexes were confirmed by elemental analyses and with the use of magnetic susceptibility measurements, MS, UV-Vis, FT-IR, ^1H-NMR, and ^{13}C-NMR techniques. The redox behaviors of the ligand and its complexes were verified with cyclic voltammetry (CV) at a glassy carbon (GC) electrode in 0.1 M tetrabutylammoniumtetrafluoroborate (TBATFB) in dimethyl sulfoxide (DMSO). - Keywords: vic-Dioxime, azacrown ether, transition metal complexes, mass spectroscopy, cyclic voltammetr More less