聚{吡咯-2,5-二[(对二甲氨基)苯甲烯]}的电化学和原位拉曼光谱

采用电化学循环伏安法（CV）和原位拉曼光谱（in situ Raman）对窄能隙共轭高分子聚{吡咯 2,5 二[(对二甲氨基)苯甲烯]}（PPDMABE）的电化学行为进行了研究.结果表明,在不同pH值NaNO3溶液中, PPDMABE的电化学氧化还原过程中存在吡咯环的氧化态结构与芳式和醌式结构之间的转变.聚合物在氧化态时吡咯环主要以氧化态存在,而还原态以芳式和醌式结构吡咯环为主.PPDMABE在酸性和中性介质中氧化态吡咯环以质子化的状态存在,而在碱性溶液中氧化态吡咯环既有质子化态,又有去质子化态的.在酸性条件下，PPDMABE较易发生氧化还原反应,而在碱性条件还原反应则较难发生.

Electrochemical and in-situ Raman Spectroscopic Studies of Poly{ (pyrrole-2, 5-diyl) [ ( p- N, N-dimethylamino)benzylidene]

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.