Thermodynamics of complex formation between hydrogen, copper(II), and nickel (II) ions and dipeptides containing non-co-ordinating substituent groups

Abstract

Formation constants for the various complexes formed between H⁺, Cu²⁺, and Ni²⁺ and a range of dipeptides which do not contain co-ordinating substituent groups have been measured potentiometrically at 25 °C and I= 0.10M(K[NO₃]). The structures of the complexed species are discussed and conclusions drawn on the equilibria present in nickel–dipeptide systems.