Abstract
The electrochemical reduction of 2,5-dibromo-3,4-ethylenedioxythiophene (DBEDT) is studied with the aid of cyclic voltammetry and electrolysis at a constant potential on a glassy-carbon electrode in a 0.1 M solution of Bu4NBF4 in dimethylformamide. Cyclic voltamograms for DBEDT exhibit two irreversible peaks corresponding to successive abstraction of bromine atoms. Electrolysis at potentials more negative than the potential of the first peak and more positive than the potential of the second peak leads to the formation of an electrochemically active film of poly(3,4-ethylenedioxythiophene) (PEDT). Cathodic polymerization of dibromothiophene with the formation of an electroactive film is performed for the first time ever without a catalyst. The poor stability of the film is attributed to the presence of exceedingly unstable monobromo-3,4-ethyl-enedioxythiophene in it. PEDT, obtained from DBEDT with the aid of thermal polymerization, forms a stable electrochemically active film when rubbed onto a glassy-carbon electrode.
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Translated from Elektrokhimiya, Vol. 41, No. 10, 2005, pp. 1200–1204.
Original Russian Text Copyright © 2005 by Girina, Ovsyannikova, Ponomarenko, Bazhenov, Kirchmeher, Alpatova.
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Girina, G.P., Ovsyannikova, E.V., Ponomarenko, S.A. et al. Peculiarities of the Electrochemical Behavior of Electroactive Films Formed during Cathodic Reduction and Thermal Polymerization of 2,5-Dibromo-3,4-ethylenedioxythiophene. Russ J Electrochem 41, 1066–1069 (2005). https://doi.org/10.1007/s11175-005-0182-0
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DOI: https://doi.org/10.1007/s11175-005-0182-0