Synthesis of Bivalent Ni(II), Cu(II) and Zn(II) Complexes of Azodicarbonamide in Mixture of Methanol and Aqueous Solvents: Spectral Characterizations and Anti-Microbial Studies

Three new transition-metal complexes were produced by refluxing azodicarbonamide
(ADCA) with nickel(II), copper(II), and zinc(II) solutions in a mixture of 50% (v/v) methanol and
water. The magnitude of chelation between metal ions and ligand molecules was assessed by FT-IR,
UV, elemental analysis, TGA, conductivity, mass, and magnetic susceptibility measurements. FT-IR
analysis suggested a bi-dentate chelation in all complexes, which takes place through the N-azo
and O-carbonyl groups. Based on the measurement of magnetic moments and spectral analysis, a
distorted octahedral geometry was proposed for Ni(II) and Cu(II) complexes, whereas zinc complex
showed a hexa-coordinated geometry