Cyclic voltammetry, chronoamperometry and controlled potential coulometry are employed to study the cathodic and anodic behavior of the complex between Ni(II) and the extended rr system N,N'-ethylenebis(monothioacetylacetonimine) in cetonitrile solvent at platinum and mercury electrodes The reduction process leads to the corresponding Ni(I) complex, stable in the electrolysis solution;the oxidation product proves to be a fourcharged cationic complex with structural features very similar to those of the starting compound.The initial complex species can be electrolytically regenerated both from the oxidized and reduced species in a quantitative yield