COMPLEXES OF SOME METAL-IONS WITH A SCHIFF-BASE LIGAND DERIVED FROM ISATIN AND DELTA-AMINOPHENOL

A series of new metal chelates of Ni(II), Co(II), Cu(II), Fe(III), Zn( II), Cd(II) and La(III) with a Schiff base ligand formed by condensati on of isatin with o-aminophenol have been synthesized and characterize d via elemental analyses, infrared, electronic spectral data, proton n uclear magnetic resonance spectra, conductivity and magnetic measureme nts. Two types of complexes were isolated. The [M(IAP)2]nH2O complexes in which two molecules of the ligand are coordinated to the central m etal ion as bis-uninegative ONO tridentate forming electrolytic and no n-electrolytic octahedral complexes. On the other hand, the dimeric [M (IAP)ClH2O]2 complexes attain the octahedral structure owing to the br idging nature of the ligand.