Thermodynamics of formation of complexes of copper(II) and nickel(II) ions with glycylhistidine, β-alanylhistidine, and histidylglycine

Abstract

Complexes formed between H⁺, Cu²⁺, and Ni²⁺ and glycylhistidine, β-alanyihistidine, and histidylglycine have been studied potentiometrically at 25 °C and I= 0.10M(K[NO₃]). The equilibria are very complicated but polynuclear species are insignificant below pH 10 in dilute solution (10^–3M). Suggestions are made as to the probable co-ordination sites as a function of pH.