In-situ Resonant Raman Spectroelectrochemical study of p-doped poly(p-phenylene vinylene): influence of the conversion

We purpose to study the electronic structure modifications induced by p typ e doping of poly(p-phenylene vinylene) (PPV). PPV is obtained by thermal an d photochemical conversion of tetrahydrothiophenium precursor. These both p olymers have some differences in their conjugation length distribution. The resonant Raman spectra analysis coupled to a dynamic model permits us to d escribe vibrational modes corresponding to the different localized charged excitations produced along the chain of these polymers after doping. The ch aracteristics of a quinoid structure are put in evidence. This one is indep endent of the conversion conditions of PPV and of the counter-ion nature.