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The electropolymerization of 5-cyanoindole in acetonitrile leads to the formation and deposition of a cyclic trimer. This trimer then undergoes further oxidation on the electrode surface to form polymeric species. The trimer and polymers can be separated by their differential solubility, and they have been structurally characterized. The structure of the trimer is analogous to that found when indole-5-carboxylic...