POTENTIOMETRIC INVESTIGATION OF TERNARY COMPLEXES OF NICKEL, COPPER, ZINC AND CADMIUM WITH<i>L</i>-α-ALANINEHYDROXAMIC ACID AND ETHYLENEDIAMINE

Abstract

Abstract Mixed-ligand complex formation of M(II) (M = Ni, Cu, Zn and Cd) with l-α-alaninehydroxamic acid (α-Alaha) as primary ligand (A) and ethylenediamine (en) as secondary ligand (B) have been determined potentiometrically [298K, μ = 0.2 (KCl)]. Formation constants for binary systems involving L-α-alaninehydroxamic acid or ethylenediamine were determined under identical experimental conditions and pH-titration data were analysed using the SUPERQUAD computer program. The relative stability of each ternary complex was compared with that of the corresponding binary complexes in terms of Δlog K and log X values.