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    Öğe
    Coordination chemistry of nickel(II), copper(II), and cobalt(II) with MN4 core-containing two novel vic-dioximes ligands.: Synthesis, spectroscopy and redox properties
    (Polish Chemical Soc, 2006) Kilic, A.; Tas, E.; Gumgum, B.; Yilmaz, I.
    Two new vic-dioxime, N-(4-amino-1-benzylpiperidine)-anti-phenylglyoxime(1,1142) and N-(4-amino-1-benzyl piperidine)-anti-glyoxime (L2H2)were prepared by the reaction of anti-phenylchloroglyoxime and anti-monochloroglyoxime with 4-amino1-benzyl piperidine in absolute THF at -15 degrees C. Mononuclear nickel(II), copper(H), and cobalt(H) complexes have a metal-ligand ratio of 1:2 in which the ligands coordinate through the two nitrogen atoms as do most vic-dioximes. The ligands and their Co(II), Cu(II), and Ni(II) complexes were characterized by elemental analyses, FT-IR, UV-vis, H-1-NMR and C-13-NMR, magnetic susceptibility measurements, electrical conductivity measurements and cyclic voltammetry. The electrical conductivity of Ni(II), Co(II), and Cu(II) metal complexes were measured using Four-Point Probe analysis. The electrochemical behavior of the Ni(II), Co(II), and Cu(II) complexes were investigated by cyclic voltammetry in DMSO.
  • [ X ]
    Öğe
    Preparation and spectral characterization of new macrocyclic Ni(II) and Co(II) complexes derived from 1,4-bis(2-carboxyaldehydephenoxy)butane and various diamines
    (Taylor & Francis Ltd, 2008) Temel, H.; Ilhan, S.; Kilic, A.; Tas, E.
    Six new macrocyclic complexes were synthesized by the template effect from reaction of 1,4-bis(2-carboxyaldehydephenoxy)butane, Ni(NO3)(2)center dot 6H(2)O or Co(NO3)(2)center dot 6H(2)O and various diamines. The metal-to-ligand ratios of Ni(II) or Co(II) metal complexes were found to be 1 : 1. Coordination of the Schiff base to Ni(II) and Co(II) through the two nitrogen and two oxygen atom (ONNO) are expected to reduce the electron density in the azomethine link and hydroxyl group. The Ni(II) and Co(II) complexes are proposed to be tetrahedral and are 1 : 2 electrolytes as shown by their molar conductivities (Lambda(M)) in DMF (dimethyl formamide) at 10(-3) M. The structures are proposed from elemental analysis, FT-IR, UV-VIS, magnetic susceptibility measurements, molar conductivity measurements, and mass spectra.