Glutamate and aspartate complexes of copper(II): equilibrium and E.P.R. measurements

Abstract

Complexes [CuHL]⁺ containing protonated ligand have been characterized for the ligands L-glutamate and L-aspartate:

                logK₃(M+H+L↔MHL) = 12.62±0.05 and 12.70±0.03

respectively, at 25°C, I 0.10 M KNO₃. Equilibrium constants have been redetermined for the complexes [CuL] and [CuL₂]^2-. Visible absorption and e.p.r. parameters are reported for the complexes; these data establish that the complexes [CuHL]⁺ have the α-amino carboxylate group coordinated to copper(II).