Spectral studies on metal-ligand bonding in complexes of 1-acetyl-2-(coumariniminecarboxamide-3-yl)hydrazine

Several new transition metal complexes derived from 1-acetyl-2-(coumariniminecarboxamide-3-yl)hydrazine (HL) have been prepared and characterized by elemental analyses, 1H-NMR, magnetic susceptibility, IR, UV, EPR and thermal analyses. Stereochemistries are proposed for the complexes on the basis of the spectral and magnetic studies. The i.r. data indicate that the carbonyl oxygen of the carboxamide constituents chelating backbone in most complexes. The visible and EPR spectral studies indicated that the Cu(II) complexes have a tetragonal geometry. From the EPR spectrum of the Cu(II) complexes, various parameters were calculated.