摘要:
The complexes of nickel alpha-benzoinoxime were prepared and isolated in the solid state with or without potassium persulfate. The complexes are noted, respectively, as complex B and complex A. They were characterized by elemental analyses, conductometry, polarography, infrared spectroscopy, W-Visible spectrometry, nuclear magnetic reasonance (H-1 NMR) and electronic paramagnetic reasonance (EPR). These techniques have shown the existence of the higher oxidation states of nickel complexed by alpha-benzoinoxime. The oxidation of nickel was due to an electronic exchange between the metal and the ligand. From these investigations, the formulas of these complexes were found to be (A):Ni(C14H11NO)(2)(OH)(2) . H2O and (B): Ni(C14H12NO2)(2)(OH)(2) . 1.5 H2O. Two separate synthese led to the same oxidation state for nickel, i.e. +IV. In the absence of the oxidant, the ligand was involved in a redox reaction which leads to differences in the physico-chemical properties (color, melting point, IR and H-1 NMR spectra) of the products.