Abstract
Abstract Poly(2,5-dihydroxyaniline), or poly[imino(2,5-dihydroxy-1,4-phenylene)] (PAn(OH)2), films were prepared by electropolymerization of 2,5-dimethoxyaniline (DMA), followed by electrochemical hydrolysis of methoxyl groups in an acidic solution. The films gave responses characteristic of a hydroquinone/quinone couple in aqueous solutions, suggesting that many hydroquinone units are introduced in the polymer structure. Although the polymer in the reduced state consisted of aniline units with substitutions by hydroxyl groups, its redox process is based on the reaction of hydroquinone/quinone couple in its structure, not on the doping/undoping in the aniline unit. Electrochemical redox processes were examined on the PAn(OH)2-modified platinum electrode. The polymer films showed electrocatalytic activities for such redox reactions as the oxidation of [Fe(CN)6]4−, Fe2+, and [Co(NH3)6]2+ in aqueous solutions. Some interactions were suggested between the hydroquinone/quinone site or the aniline unit in the polymer and the redox active metal complexes in the solution and/or in the polymer.
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