Coordinating behaviour of a tridentate Schiff-base in its normal and hemi-acetal forms towards some 3 d-metal ions

Abstract

Metal complexes of the empirical formula [M(Hpbzgh)2], where H2pbzgh=pyridoxal N-benzoylglycyl hydrazone and M=Mn(II), Co(II), Ni(II), Cu(II), Zn(II), have been synthesized and their structures studied by electronic, IR,1H and13C NMR spectra. IR and NMR spectral data indicate uninegative tridentate coordinated ligand bonding through hydrazidic carbonyl/imidolic oxygen, azomethine nitrogen and phenolate oxygen with its pyridoxal moiety in hemi-acetal as well as normal forms. Magnetic and electronic spectral data suggest distorted octahedral geometry for the Mn(II), Co(II), Ni(II) and Cu(II) complexes. © 1995 Indian Academy of Sciences.