Cobalt(II), nickel(II) AND zinc(II) dicarboxylate complexes with hydrazine as bridged ligand

Abstract

Abstract Cobalt, nickel and zinc dicarboxylate complexes containing neutral hydrazine as bridged bidentate ligand of the type MX(N2H4)n where n=1 for X=OOCCH2COO and n=2 for X=OOCCH2COO, OOCCH2CH2COO and OOCC(CH2)CH2COO have been prepared by aqueous reactions. These complexes have been characterized by analytical, spectral and thermal studies. The electronic spectra coupled with magnetic moments of cobalt and nickel complexes suggest these complexes are of high-spin variety with octahedral geometry. Infrared spectra indicate the bridging bidentate nature of hydrazine moieties present in both mono-hydrazine and bis-hydrazine complexes and the dicarboxylate ions coordinate to the metal as bidentate ligand through the monodentate coordination of each carboxylate ion. However, in the mono-hydrazine metal malonates both carboxylate ions act as bridged ligands. Simultaneous TG-DTA curves of all the complexes in air resulted in the formation of respective metal oxide as final residue at low temperatures (300–40...