Mixed ligand complex formation by cobalt(II) and zinc(II) ions

Abstract

Cobalt(II) and zinc(II) form mixed complexes of the types MAB in solutions containing the following pairs (A and B) of ligands, ethylenediamine and histamine, ethylenediamine and serine anion, and histamine and serine anion. Stability constants of these complexes have been computed from titration data. At higher pH values, small amounts of the mixed complexes MA₂B and MAB₂ were also present. In all cases, stability constants for mixed ligand complexes were comparable with, or greater than, the mean of constants for the complexes containing only one kind of ligand.