Dislocation discrimination: the interaction of zinc(II) and cadmium(II) with dibenzo-substituted macrocyclic and open-chain tetra-amines

Abstract

Thermodynamic stabilities have been determined for zinc(II) and cadmium(II) complexes of a series of macrocyclic and open-chain tetra-amines; for the 14- to 16-membered macrocyclic systems a dislocation in the stability pattern occurs for zinc(II) at the 16-membered ring complex while, for cadmium(II), the dislocation occurs at the 15-membered ring species resulting in an enhanced stability difference [Zn^II>Cd^II] for the complexes of this latter ring.