COMPLEXES OF TETRADENTATE SCHIFF BASE LIGANDS WITH DIVALENT TRANSITION METALS

ABSTRACT

New homo-dinuclear metal complexes of the Schiff base ligands 2-{4-[4-(2-hydroxyphenyliminomethyl)anilinomethyl]-phenyliminomethyl}phenol (H₂ ¹), 3-{4-[4-(2,3-di-hydroxy- phenyliminomethyl)anilinomethyl]phenyliminomethyl}-1,2-benzene-diol (H₂ ²) and 4-bromo-2-{4-[4-(5-bromo-2-hydroxyphenyliminomethyl)anilinomethyl]phenyliminomethyl}phenol (H₂L³) have been prepared in EtOH solution and were characterized by infrared, electronic and ¹H and ¹³C NMR spectra, and by magnetic susceptibilities and molar conductivity measurements. The mass spectra of the Schiff base ligands were recorded. The ligands coordinate as neutral ligands via the Schiff base azomethine nitrogen and phenolic oxygen atoms. The keto-enol tautomeric forms of the Schiff base ligands H₂L¹, H₂L² and H₂L³ have been investigated in polar and apolar organic solvents.

Acknowledgments