OXIDOREDUCTION CHARACTERISTICS OF AMINOQU INONES OBTAINED BY THIN-LAYER SPECTROELECTROCHEMISTRY

Thin layer spectroelectrochemistry is used to study the electronic tra nsfer between platinum electrode and several aminoquinones in aqueous medium. According to the composition of the medium, the electronic tra nsfer occurs in one or two steps. The redox systems are very fast, so it is possible to determine the apparent standard potential values by means of the intensity-potential curves. The comparison of these value s with those corresponding to the systems O-2/O-2 .(-) et O-2 ./H2O2 p ermits to anticipate the reactivity of these compounds in the dispropo rtionation reaction of the superoxide anion.