Syntheses and Investigations on Coordination Compounds Having Oxygen and Nitrogen Donors


Abstract A bidentate ligand (L), {[(3-hydroxy-1-methylbutyl)-2-en-1-yliedene]amino} hexanoic acid, derived from acetylacetone and 6-aminocaproic acid and its cobalt(II), nickel(II) and copper(II) complexes have been synthesized and characterized by metal analysis, molar conductances, magnetic moments, IR and electronic spectral measurements. The stoichiometric reaction between the metal(II) ion and the synthesized ligand in molar ratio of M:L (1:2) forms the metal complexes of type [M(L)2(H2O)2] (where M = Co(II), Ni(II) or Cu(II)), and of M:L (1:1) of type [M(L)(H2O)2] Cl (where M = Ni(II) or Cu(II) and Co:L (1:1) of type [Co(L) (H2O)4] Cl. Infrared spectra of all the complexes agree that the complexes with the coordination to the central metal ion through the nitrogen of azomethine group and the negative oxygen atom of the carboxylate group. The magnetic moment data suggested for the complexes with metal : ligand ratio as 1:2 and of Co:L (1:1) to have an octahedral geometry around the central metal ion and a square planar configuration for nickel and copper complexes with the metal : ligand ratio as 1:1. The electronic spectral data also agree with their proposed structures.