EFFECT OF 4-AMINODIPHENYLAMINE ON THE ELECTROREDUCTION OF 4-NITROSODIPHENYLAMINE AT SOLID ELECTRODES

The effect of 4-aminodiphenylamine (I) on the electroreduction of 4-ni trosodiphenylamine (II) is studied by the voltammetric method at stati onary copper and platinum electrodes. The conclusion that the electror eduction of II is inhibited by I is drawn on the basis of the followin g: the directly proportional dependence of the current on the concentr ation of II is violated, the current decreases with time at a constant potential and with an ordinal number of the experimental run conducte d without renewing the electrode surface, the current also decreases u pon adding I. It is shown that I partially desorbs from the surface of the electrode kept in solution at potentials insufficient for the I f ormation. The reaction rate remains the same if an organic solvent mis cible with the aqueous phase and dissolving I is introduced to the pha se. The inhibition effect can partially be eliminated by elevating the temperature.