Structural Investigations of Some Metal Complexes of Malon-Di-(α-Naphthyl) Amide-Oxime

Abstract

The study investigates the structural properties of Cu(II), Ni(II), Fe(II), Co(III), Zn(II), Cd(II), and Hg(II) complexes with malon-di-(α-naphthyl)amide-oxime (isonitroso malon-di-(α-naphthyl)amine oxime). It summarizes chemicals, equipment, experimental methods, metal-ligand bonding, stereochemistry, oxidation states, and coordination modes using spectral and magnetic data. Solution studies done with reagent and metal salts assisted in predicting geometry for these complexes, to finalize the M:L ratios and have allowed the pH to be established to separate the complex formed in solid state. The green Cu(II) complex is dimeric, confirmed by its electronic and reflectance spectra, with a likely square planar structure, Bleaney-Bower’s equation helped to finalize the dimeric complex formation. Yellow Ni(II) and dark-blue Fe(II) complexes are paramagnetic, suggesting high-spin octahedral geometries. The dark-red Co(III) complex exhibits weak paramagnetism, explained by the Van Vleck term, spectral data, and its diamagnetic nature, indicative of an octahedral structure. Zn(II), Cd(II), and Hg(II) complexes are assigned tetrahedral structures based on magnetic and infrared spectral data.  From the dark colours of the complexes obtained, they may be utilized as complexing agents like the well-known oxime containing ligands.