Synthesis and Electrochemical Properties of a Polythiophene-Viologen Polymer

摘要

This article reports the chemical synthesis and electrochemical properties of poly(I) (I = 1-methyl-1'-(3- thiophene-3-yl)-propyl-4,4'-bipyridinium bis-hexa-fluorophosphate), a polymer with a conducting polymer, polythiophene, as the backbone and a redox couple, viologen (V2 = N,N' - dialkyl-4,4'-bipyridinium), as the pendant group. Poly (I) can be grown by the oxidation of I and thereby deposited onto the electrode surface. The cyclic voltammetry of poly(I) in CH3/CN/0.1 M n-Bu4N pf 6 shows an oxidation wave at 0.6 V vs Ag/Ag and the resistivity of the polymer declines by a factor of Ten to the 5th power upon changing the potential from 0.4 V to 0.8 V, consistent with the behavior of polythiophene and its derivatives. Poly(I) also exhibits two successive one-electron reduction waves at -0.6 V and -1.1 V vs. Ag/Ag, as expected for the V2 group. Reprints.(jes)