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电化学(中英文) ›› 1995, Vol. 1 ›› Issue (4): 389-396. 

• 研究论文 • 上一篇    下一篇

现场拉曼光谱研究聚吡咯的去质子化和氧化降解

高劲松,陈菁,陈衍珍,薛奇,田中群   

  1. 厦门大学固体表面物理化学国家重点实验室,厦门大学化学系, 南京大学化学系
  • 收稿日期:1995-11-28 修回日期:1995-11-28 出版日期:1995-11-28 发布日期:1995-11-28

Studies of In-situ Raman Spectroscopy on Deprotonation and Degeneration of PPY Films

Gao Jinsong;Chen Jing;Chen Yanzhen;Xue Qi;Tian Zhongqun   

  1. (State Key Laboratory for Physical Chemistry of Solid Surface,Department of Chemistry,Xiamen University,Xiamen University,Xiamen 361005)1)(Department of Chemistry, Nanjing University,Nanjing 210093
  • Received:1995-11-28 Revised:1995-11-28 Published:1995-11-28 Online:1995-11-28

摘要: 利用电化学现场拉曼光谱结合循环伏安法,研究了中性和碱性溶液中聚吡咯(PPY)膜的行为及其结构.结果表明,氧化态PPY中吡咯环N原子上的H失去发生去质子化,形成一种醌式结构.由于该醌式结构的出现使PPY的C=C伸缩振动峰发生分裂,且因该醌式结构不能被进一步氧化,以致pH值增大,去质子化程度提高,PPY变得较难被氧化,而使其可逆性也受到一定程度的破坏,在pH=13的强碱性溶液中,PPY膜在正于OV的电位区间内发生降解,该降解过程可能涉及到PPY的吡咯环单元结构的破坏.

关键词: 现场拉曼光谱, 聚吡咯, 去质子化, 降解

Abstract: By combining the in-situ Raman spectroscopic technique with the normalelectrochemical measurements ,the behavior and structure of PPY films in neutral or basic solutionswere studied.The oxidized PPY loses protons on the N atoms of pyrrole rings and is deprotonated inthese solutions ,resulting the formation of the quinoid structure. It makes the C=C stretching vibrationbonds of PPY split.Because this quinoid structure can′t be further oxidized ,the PPY becomes moredifficult to be oxidized and less reversible with the increasing of pH value of solutions and the degree ofdeprotonation of PPY. In the strong basic solution ( pH=13),the PPY film is degenerated in thepotential region more positive than O V. The degeneration may be related to the damage of the pyrrolering structure of PPY.

Key words: In-situ Rarman spectroscopy, Polypyrrole, Deprotonation

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