ELECTROCHEMICAL STUDY OF 1,5-DIPHENYLCARBAZIDE AND 1,5-DIPHENYLCARBAZONE IN 0.3 M HCLO4

Diphenylcarbazide (DPCI) or diphenylcarbazone (DPCO) is introduced int o carbon paste electrodes in order to determine the potential ranges w here the oxidation-reduction processes of these species occur in 0.3 M HClO4, The potential controlled electrolysis was performed for DPCI a nd DPCO dissolved in 0.3 M HClO4. From the coulometric results and the UV-visible spectral data of the solution before and after the electro lysis it is possible to establish that DPCI is oxidized in an irrevers ible process giving diphenylcarbadiazone (DPCDO). DPCO is probably an intermediate in this oxidation, but its concentration is never high be cause it is slightly more easily oxidized than DPCI, DPCO can be reduc ed to DPCI at about 0.2 V (ECS) and, finally, DPCDO can be reduced to DPCI at about - 0.5 V (ECS), Again, DPCO is probably an intermediate b ut is not detected because it is so much more easily reduced than DPCD O.