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Paper | Regular issue | Vol 83, No. 11, 2011, pp.2517-2524
Published online, 6th October, 2011
DOI: 10.3987/COM-11-12313
Voltammetric Behavior of Mediator-Modified Electrode by Electrochemical Copolymerization of Nitroxyl Radical Precursor Containing Pyrrole Side Chain and Thiophenes

Yoshitomo Kashiwagi,* Makiko Tsunoda, and Tetsuya Ono

*School of Pharmaceutical Sciences, Ohu University, 31-1 Misumido, Tomita-machi, Koriyama, Fukushima 963-8611, Japan

Abstract

This paper describes the voltammetric behavior of the TEMPO (2,2,6,6-tetramethylpiperidine-1-oxyl)-modified electrodes prepared by the electrochemical copolymerization of TEMPO precursor containing pyrrole side chain and thiophenes. The prepared TEMPO-modified electrode with 2,2’-bithiophene exhibits a symmetrical reversible redox wave at +0.7 V versus Ag/AgCl, which originates from the electron transfer between the pyrrole and 2,2’-bithiophene-copolymerized layer and the electrode. The electrochemical copolymerization using 2,2’-bithiophene showed a nonlinear behavior between the anodic peak current in the cyclic voltammogram of the copolymers-modified electrode and the fraction of TEMPO precursor containing pyrrole side chain in solution. The copolymers-modified electrode exhibits high electrocatalytic activity for the oxidation of alcohol.