Synthesis and Characterization of Co(II), Ni(II), Cu(II), Zn(II) and Cd(II) Complexes with Aroylhydrazonemonoximes


Two novel aroylhydrazonemonoxime ligands and their metal (II) complexes of [CoII,NiII,CuII,ZnII,CdII] were synthesized. These ligands are Diacetylmonoxime-4-nitrobenzoylhydrazone (L1H2), Diacetylmonoxime-4-hydroxybenzoylhydrazone (L2H2). The synthesized 4-hydroxybenzoyl hydrazide and 4-nitrobenzoylhydrazide were reacted with diacetyl monoxime to obtain the (L1H2, L2H2) ligands. Mononuclear complexes of these ligands of the type [M(LnH)2] where (M- = CoII,NiII,CuII,ZnII,CdII; n =1,2) with metal:ligand molar ratio of (1:2) were prepared in the presence of Et3N . The metal ions complexes [M(LnH)2] are proposed to be six-coordinated with a N4O2 donor environment. Each ligand is coordinated through the oxime nitrogen, the imine nitrogen and the enolic oxygen atoms while the phenolic hydroxyl and oxime hydroxyl groups of aroylhydrazonemonoxime moiety do not participate in coordination. The structures of the complexes were suggested on the basis of 1H-NMR, 13C-NMR, FT-IR, elemental analysis (CHN), magnetic susceptibility measurements and U.V.–visible spectroscopy.