CHARGE-TRANSFER STUDIES OF PYRROLE COPOLYMERS SUBSTITUTED BY ANTHRAQUINONE, PHENOTHIAZINE OR ANTHRACENE MOIETIES

Charge transfer to the functionalized group has been investigated in several functionalized homopolymers and copolymers of pyrrole. The cases of anthraquinone, phenothiazine and anthracene moieties with the substituent linked to the nitrogen (N-polymers) and of anthraquinone and anthracene with the substituent linked to the 3-position of pyrrole (3-polymers) have been examined. As previously described, the copolymers were synthesized "at random" from binary solutions of monomers. The apparent diffusion coefficients of the electrons, determined for all the N-polymers over a large dilution range, showed significant variations with the relative proportion of the substituted group in the polymer and a strong dependence on the nature of the electroactive group. In contrast, there were only small variations with the nature of the supporting electrolyte and none at all with its concentration. Fewer results were obtained on the 3-polymers because of the unexpected reactivity of the pyrrole radical cation with the anthracene moieties which led to a very poor polymerization yield.