Synthèse et étude électrochimique de polymères organiques conducteurs dérivés d’arylène-cyano-vinylènes.

Abstract

The anodic oxidation of some monomers consisting of electron-donor units and electro-acceptor units in a 0.2M / CH2Cl2 Bu4NPF6 organic medium on a platinum electrode or on an ITO electrode is followed by cyclic voltammetry and chronoculometry. Two series of monomers are studied, one of formula Ar1-cyanovinylene-Ar2 and the other of formula Ar1-cyanovinylene-Ar2-cyanovinyleneAr1 with Ar2 = phenyl and Ar1 = phenyl, 3-methylthienyl, fluorenyl, furyl, 3, 4- ethylenedioxythienyl, phenoxyphenyl. The majority of the monomers polymerize and those with Ar1 = thienyl or EDOTyl also possess a reversible and stable n-doping. Dicyaned polymers which must have greater regioregularity have a smaller gap than single-chain polymers, resulting from stronger interactions between donor and acceptor motifs along the conjugated chain. All polymers are characterized by IR, UV-Visible and fluorescence. The theoretical calculations of charge densities of the radical-cations have shown that the electropolymerization active sites are those expected.