ELECTROCATALYTIC REDUCTION OF SOME IMINO COMPOUNDS ON A GLASSY-CARBONELECTRODE ELECTROCHEMICALLY MODIFIED WITH A NEW COPPER-SALEN COMPLEX

A copper complex of the half-unit 2,6-diacetylpyridine-mono(ethylenedi amine) was prepared and characterized using analytical, spectral and m agnetic measurements. The electropolymerization of this complex on gla ssy carbon electrode was performed. A new electroactive polymeric film was prepared by potential sweep electrolysis. Electroanalytical studi es were carried out using the cyclic voltammetric technique to examine the indirect electroreduction of 4-cyano-6-mereapto-5-phenyl-3-(2H)-p yridiazinimine derivatives (compounds IIa-IId) modified with the Cu co mplex. In the absence of compounds IIa-IId the film showed a single pa ir of peaks corresponding to the Cu(II)/Cu(I) redox system. However, i n the presence of the imino compounds, a catalytic effect was observed and the anodic peak for Cu(I) oxidation disappeared at low scan rates . The imino group was reduced to give the corresponding amino compound s. Direct electrochemical reduction of compounds IIa-IId was performed for comparison. The proposed mechanism has been confirmed by cyclic v oltammetry and the product of controlled-potential electrolysis was id entified via elemental analysis, IR spectroscopy and H-1 NMR spectrosc opy.