Synthesis, characterization and extraction properties of four unsymmetrical vic-dioximes and their complexes with nickel(II), cobalt(II) and copper(II)

Four new unsymmetrical vic-dioximes: [(LH2)-H-1] N-(4-acetanilidyl) amino-amphi-glyoxime, [(LH2)-H-2] N-(4-acetanilidyl) amino-anti-glyoxime, [(LH2)-H-3] N-(2-thiazolyl) amino-amphi-glyoxime and [(LH2)-H-4] N-(2-thiazolyl) amino-anti-glyoxime were prepared by the reaction of amphi-chloroglyoxime and anti-chloroglyoxime with 4-aminoacetanilide and 2-aminothiazol in absolute ethanol. The preparation Ni(II), Co(II), and Cu(II) complexes of the amphi-and anti-isomers of these ligands are described. The ligands and their complexes were characterized by elemental analyses, IR, mass, H-1 and C-13 NMR spectra and magnetic susceptibility measurements. Ligands complexing properties were studied by the liquid-liquid extraction of selected alkali (Li+, Na+, K+, Cs+) and transition metals (Co2+, Ni2+, Cu2+, Zn2+, Cd2+, Hg2+, Pb2+). It has been observed that all ligands show a high affinity to Cu2+ and Hg2+ ions, where as almost no affinity to alkali metals. The extraction equilibrium constants (Kex) for complexes of ligands with Cu2+ and Hg2+ metal picrates between dichloromethane and water have been determined at 25 degrees C.