DIRECT INVOLVEMENT OF ACID CENTERS OF POLYANILINE IN CHARGE-TRANSFER ON ORGANIC ACCEPTOR

Electrochemical behavior of hydroquinone and 4F-hydroquinone has been studied on Pt/polyaniline (PANI) electrodes in 1 M H2SO4 solution. Red ox transformation of quinone/hydroquinone systems takes place on PANI practically without overpotential and, probably, the two-electron char ge transfer processes are realized in such systems. Reaction currents depend un PANI quantities deposited on the Pt electrode and the molecu lar complex is formed. There exists a great electronic exchange betwee n acid centers of PANI and quinone/hydroquinone molecules, resulting i n electronic conjugation of this surface state (adsorbed molecule) wit h the polymer. Existence of such complexes was confirmed by FT-IR anal ysis which has been carried out on free-standing polymer films. Based on these findings we have assumed that the charge transfer complexes f orm along the polymer chain and the acceptor molecules participate in the doping and conductivity processes.