The electrochemical behavior of a complex of cobalt with dimethylglyoxime Co(DMG) 2 (ç 2 é) 2 is studied by cyclic voltametry. Peaks corresponding to redox transitions ëÓ( III )/ëÓ( II ) and ëÓ( II )/ëÓ( I ) are observed in the potential region 0.4 to -1.8 V (Ag/AgCl). The product of reduction of the initial complex interacts with carbon dioxide to form a stable compound, probably an intermediate product of electrocatalytic reduction of ëé 2 to CO in the presence of N 4 -macrocyclic complexes of cobalt.