Catena-mu-N,N’-bis-(hydroxyethyl)dithiooxamidatocopper(II) on a platinum electrode, (HOC2H4)2dtoaCu/Pt, prepared as a modified film can undergo an electrochemical redox process. The chemical character and form of the reduced species are of interest. Instead of the electrochemical oxidizing process, a chemical oxidizing process of the reduced species using MV2+ was tried. The MV.+ produced was detected spectroscopically, and identified photometrically. The amount of MV.+ produced varied depending on the reduction time at - 1.2 vs. SCE. A chemical moiety of the electrochemically reduced product can exist for some time and act as a reductant for oxidants (MV2+ in this case) after disconnection of the potentiostat. Given the general recognition of the formation of copper hydride in homogeneous catalytic processes by Cu2+ ions in reductions of inorganic and organic substrates under high pressure hydrogen, the chemical moiety of the reduced species on the Pt electrode seems to be hydridocopper with R2dtoa2- as a coexisting ligand.