Voltammetric Studies of the Redox Polymer Poly[4,4′-bipyridinium-1,1′-diylcarbonyl-2,5-thiophenediyl Dichloride] in Dimethyl Sulfoxide

Abstract

Abstract The electrochemical behavior of a redox polyelectrolyte, poly[4,4′-bipyridinium-1,1′-diylcarbonyl-2,5-thiophenediyl dichloride] at mercury electrode has been examined in dimethyl sulfoxide containing different concentrations of tetrabutylammonium iodide. The techniques of sampled DC polarography, pulse polarography (normal and differential), and cyclic voltammetry have been used. All polarograms revealed three one-electron reduction waves which are found either quasi-reversible or irreversible and usually adsorption-controlled by cyclic voltammetric experiments. The results were discussed by taking into account the implications of different concentrations of supporting electrolytes and polycation conformations on the adsorption processes consisting of preceding and following chemical reactions coupled with charge transfer reactions occurring at the electrode.