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-(coumarinimi necarboxamide-3-yl)hydrazine (HL) have been prepared and characterized by e lemental analyses,H-1-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 carbony l oxygen of the carboxamide constituents chelating backbone in most complex es. The visible and EPR spectral studies indicated that the Cu(II) complexe s have a tetragonal geometry. From the EPR spectrum of the Cu(II) complexes , various parameters were calculated. (C) 2001 Elsevier Science B.V. All ri ghts reserved.