Spectroelectrochemical Raman study of a new series of thiophene/phenylene co-oligomers

In this article we will study the electrochemical voltamperometric waves of two thiophene/phenylene co-oligomers. We will choose various anodic potent ials as in the oxidative and as in the reductive branches in order to recor d the Raman spectra as a function of the electrochemical doping level. The evolution of the doping induced Raman bands indicates the existence of radi cal cations at low oxidation potentials and dications at high anodic potent ials. The participation of the phenyl caps in the structure of the electron ic defects is shown.