Electropolymerization of 9,9-dialkyl-substituted fluorenes with long alkyl chains and redox responses of the resulting electroactive films for electrochemical capacitor materials

Electropolymerization of 9,9-dialkylfluorenes (R_nfluo, n: number of carbons in the chain) with long normal alkyl chains (n = 4, 5, 6, 8, and 10 compared with n = 1) were investigated during sequential potential cycling. Among the R_nfluos, significant film growths were observed for the R_nfluo with n = 1, 8, and 10. The R₈fluo and R ₁₀fluo-based films were also found to consist of the monomer unit with higher molecular weight than the R₁fluo-based film. A doping/undoping response of the new electroactive poly(R₁₀fluo) film was compared with that of poly(R₈fluo) from a fundamental viewpoint as an electrochemical capacitor material.