Electrochemical and in-situ Raman spectroscopic studies of poly{(pyrrole-2, 5-diyl)[(p-N, N-dimethylamino)benzylidene]}

Abstract

Cyclic voltammetry (CV) and in-situ Raman spectroscopy were used to study the electrochemical properties of the narrow band-gap conjugated polymer poly ((pyrrole-2, 5-diyl) [(p-N, N-dimethylamino) benzylidene]} (PPDMABE). The results reveal that the pyrrole rings in oxidized state of PPDMABE exist in oxidized state, while in reduced state aromatic and quinonoid structure pyrrole rings co-exist. The electrochemical reduction of PPDMABE is easier in acid solutions than in base solutions. In acidic and neutral media, the oxidized pyrrole rings exit in the form of protonized state, while in basic media they exit both in the form of protonized and deprotonized states.