Study of binary and ternary complexes of some binucleating ligands

Abstract

Stability constants of homobinuclear Cu(Il) complexes of some dinucleating ligands, having equivalent (N - O^-) coordinating sites, viz., 4,4'-di-(<i>o-</i>hydroxybenzyl)diaminodiphenylmethane (H₃A¹) and 4,4'-di-(<i>o</i>-hydroxybenzyl)diaminodiphenylether (H₃A²) and mixed ligand Cu(II) complexes with one of the above ligands and bipyridyl, glycine, α-alanine, phenylalanine, tyrosine or tryptophan as secondary ligands, have been determined potentiometrically in (50:50;v/v)water-dioxane medium using a computer program. The relative stabilities of the different complexes have been explained. The complexes [Cu₂AL₂] (ClO₄)₂, [where, L=bipy or 1, 10 Phen, and A=4,4'-di-(<i>o</i>-hydroxybenzyl)diaminodiphenylmethane], have been isolated and characterized by elemental analysis, electronic, ESR spectral and magnetic studies.