Spectroelectrochemical studies on poly-o-phenylenediamine .1. In-situ resonance Raman spectroscopy
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The structure of poly-o-phenylenediamine in the redox process has been studied using in-situ resonance Raman spectroscopy, in-situ UV-Vis subtractive reflectance spectroscopy and cyclic voltammetry. The results show that the structure of PoPD is dominated by a ladder polymer with phenazine rings, and at least three structures of PoPD are formed in the redox process. The three kinds of PoPD have different resonance enhancement effect, and the electronic structure of PoPD molecule is influenced obviously by protonation. The results also show that the most stable state of PoPD is its semi-oxidized state.