Synthesis, Characterization of Some New Mononuclear and Dinuclear Complexes and Study of Complexation-ability of diacetylmonoxime-2-hydroxy-2,2-diphenylacetohydrazone to Some Metal Cations

. Two types of mononuclear and dinuclear copper (II), cobalt (II) and nickel (II) complexes with tetradentate N2O2 donor and tridentate N2O ligand diacetylmonoxime-2-hydroxy-2, 2-diphenylacetohydrazone (H3L) have been synthesized and characterized by analytical and physicochemical techniques, that is, elemental analyses, molar conductivity, UV-vis, IR, 1H-NMR spectra, magnetic susceptibility measurements. The reaction of metal (II) chloride hydrate with the ligand in ethanolic solution gives mononuclear metal (II) complexes with general formula [M (H2L) Cln] (M = Cu (II) and Co (II), n = 1, Ni (II), n = 2), where the ligand act as monoanionic O, O, N, N-tetradentate and the coordination takes place in the keto form, coordinated through the carbonyl oxygen, deprotonated alcoholic oxygen, oximate nitrogen and hydrazone imine nitrogen atoms, whereas, the ligand react with metal (II) acetates in the presence of strong base (KOH) to form common bimetal (II) oximato complexes with general formula, [{M (HL) }2] in which two metal (II) atoms are bridged through two N-O bridges of the oximato ligand to afford a binuclear structure, where the ligand act as dianionic O, N, N-tridentate where both the oxime and hydrazone imine protons are deprotonated, while the alcoholic hydroxyl group of ligand do not participate in coordination. The extraction ability of hydrazoneoxime ligand has been examined by the liquidliquid extraction of selected transition metal [Co2+, Ni2+, Cu2+, Zn2+, Cd2+, Hg2+and Pb2+] cations. The ligand shows strong binding ability toward Cu2+, Hg2+ and Pb2+ ions.