STRUCTURAL STUDIES OF SOME COMPLEXES OF DIVALENT TRANSITION METALS WITH A TETRA-DENTATE DERIVATIVE OF HYDROXAMIC ACID

Abstract

Hydroxamic acids are versatile chelating agents known for their ability to form stable complexes with transition metal ions. In this study, a tetra-dentate derivative of hydroxamic acid was synthesized and used to prepare coordination complexes with divalent transition metals such as Cu(II), Ni(II), Co(II), and Zn(II). The complexes were characterized using elemental analysis, molar conductance, infrared spectroscopy, UV-Visible spectroscopy, magnetic susceptibility, and X-ray diffraction (powder/XRD) studies. The results confirmed the tetra-dentate coordination of the hydroxamic ligand through oxygen donor atoms. The structural data revealed that the geometry of the complexes varied with the nature of the central metal ion: octahedral structures were predominant for Ni(II) and Co(II), while square planar geometry was observed for Cu(II). These findings highlight the potential of hydroxamic derivatives as multifunctional ligands in coordination chemistry and bioinorganic applications. Keywords: Hydroxamic acid, Tetra-dentate ligand, Transition metal complexes, Structural studies, Coordination chemistry.