Spectroelectrochemical and structural studies of p-doped poly(p-phenylene vinylene)

The purpose of this study is to characterize the different modifications in the electronic distribution on the poly(p-phenylene vinylene) (PPV) backbone, induced by doping. The effects of in-situ electrochemical oxidative doping by ClO^-₄ is followed by optical absorption spectroscopy and resonant Raman scattering. On the basis on the Raman spectra, we have identified the vibrational modes associated with the positive polarons, bipolarons and neutral segments. The perturbation associated with the coexistence of these polaronic and bipolaronic segments has been described as a quinoid structure growing at the expense of the benzoid one.