Poly(1-substituted pyrrole)s were prepared on a platinum electrode with different electrolysis times, and their properties were studied by cyclic voltammetry. The oxidation potential for most of the poly(1-alkylpyrrole)s were almost 0.3 V versus the Ag/Ag ϩ reference electrode, except for poly(1-butylpyrrole). The electron transfer rate in polymer films depends on the electrolysis time and the size of the substituent. The difference of the redox peak potential of poly(1-phenylpyrrole) was smaller than that of poly(1-anisylpyrrole) films. The role of a substituent in the electrochemical behavior of the polymer main chain is discussed.

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