ELECTROCHEMICAL CHARACTERISTICS OF SOME N-(HYDROXYALKYL) AND N-(TOSYLALKYL) PYRROLES - ELECTROCHEMICAL-BEHAVIOR OF THE CORRESPONDING POLYMERS

We present an electrochemical study of a series of thirteen N-alkyl derived pyrrole monomers, where the substituent of the alkyl chain is a hydroxyl or a tosyl group. The anodic peak potentials are mainly influenced by the steric hindrance of the substituent. Electropolymerization of hydroxylated pyrrole monomers is blocked for short alkyl chains (C//2 or C//3). This may be due to the internal attack of the pyrrole cation radical. The best electropolymerizability of pyrrolic monomers, as well as the cycling stability of the corresponding polymers, is observed for compounds with a linear C//6 alkyl chain or with a C//3 branched alkyl chain bearing two pyrrole groups for one substituent.