Synthesis, characterization and quantum chemical studies of some Co(II) and Cu(II) complexes of acetoacetic acid hydrazide

Abstract

New complexes of cobalt(II) and copper(II) acetoacetic acid hydrazides have been synthesized and characterized by elemental analysis, infrared and electronic reflectance spectra and room temperature magnetic susceptibility measurements. The infrared spectra of the complexes revealed the coordination to the metal ion occurs at the carbonyl oxygen and the amino nitrogen of the hydrazide moiety. This was supported by theoretical calculations. The conjoint of the electronic spectra and magnetic susceptibility measurements suggests plausible octahedral geometry for the cobalt(II) complexes while the copper(II) complexes adopt a square planar geometry. The stereochemistry of the modeled structures calculated by semi-empirical (PM3) and density functional theory (DFT) methods are also consistent with those experimentally deduced.