Abstract

The behaviour of electrodes coated with either monomeric or polymeric anthraquinone (AQ) deposits has been investigated in aqueous media. The basal compound PHAS ([1-(pyrrol-1-yl)-hex-6-yl]-9,10-anthraquinone-2-sulphonate), consisting of an anthraquinone linked to a pyrrole moiety via an alkyl linkage, is electroactive either as air-dried monomer layers or when it is electropolymerized on different electrodes at various pHs. However, platinum-coated electrodes were found to work only at basic pH (7–14), whereas glassy carbon electrodes work in the entire pH range (0–14), with the redox potential of the AQ/AQH 2 couple depending linearly on ambient pH. Unlike the monomer layers, polymer films are electroactive only if 30% acetonitrile is added to the aqueous electrolyte.

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