Abstract
The oxidation and reduction behaviour in acetonitrile solution of the copper(II) complexes with a series of linear tetra-amines of varying chain length has been investigated by electrochemical techniques. Copper(III) tetra-amine complexes were found to persist in solution only on the time-scale of the cyclic voltammetry experiment, whereas fairly stable CuI complexes were obtained in the case of both the shortest- and the longest-chain tetra-amine ligands investigated. E½ values for both the CuIII→ CuII and the CuII→ CuI redox changes have been compared with those reported for corresponding complexes with closed-chain tetra-amines (macrocycles) in order to explore the existence of a ‘macrocyclic effect’.
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