PREPARATION AND CHARACTERIZATION OF SOME TRANSITION-METAL COMPLEXES OF BENZOIC-ACID HYDRAZONES OF 2-AMINONICOTINALDEHYDE

Cu(II), Ni(II), Co(II), Zn(II) and Pd(II) complexes of tridentate Schiff base ligands derived from the condensation of benzoic acid hydrazides with 2-aminonicotinaldehyde have been prepared and characterized. For M = Cu, Ni, Co and Zn the complexes were formulated as [M(ligand)(H2O)X] (X = Cl, Br), with a distorted octahedral geometry and tridentate Schiff base ligands. The Pd complexes were formulated as Pd(ligand)Cl2, with square planar geometries and bidentate Schiff base ligands. The e.s.r. spectra of the Cu(II) complexes are discussed.