物理化学学报 >> 2005, Vol. 21 >> Issue (10): 1117-1121.doi: 10.3866/PKU.WHXB20051011

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2,2′-联吡啶与锌电极作用的表面增强拉曼光谱研究

顾仁敖; 沈晓英; 王梅   

  1. 苏州大学化学系, 苏州 215006
  • 收稿日期:2005-03-07 修回日期:2005-05-08 发布日期:2005-10-15
  • 通讯作者: 顾仁敖 E-mail:ragu@suda.edu.cn

Study on the Interaction of 2,2′-bipyridine and Zn Electrode by Surface-enhanced Raman Spectroscopy

GU Renao; SHEN Xiao-ying; WANG Mei   

  1. Department of Chemistry, Suzhou University, Suzhou 215006
  • Received:2005-03-07 Revised:2005-05-08 Published:2005-10-15
  • Contact: GU Ren-ao E-mail:ragu@suda.edu.cn

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摘要： 利用表面增强拉曼光谱(SERS)对2,2′-联吡啶分子在锌电极表面的吸附进行了研究. 实验表明, 2,2′-联吡啶和锌电极有较强的相互作用, 2,2′-联吡啶和锌表面的氧物种存在竞争吸附, 起始电位较正时, 氧物种的吸附使2,2′-联吡啶吸附电位负移；起始电位较负时, 2,2′-联吡啶的吸附抑止氧物种的吸附, 使其吸附电位正移, 且相同电位下氧化种的吸附量大大减少. 同时当电极电位由正往负移时, 吸附在锌表面的2,2′-联吡啶会发生构型转化, 在－1.3 V下以顺式构型垂直吸附, 而当电位负移至－1.4 V时则以反式构型吸附；而电极电位由负往正移时, 在研究电位区间内2,2′-联吡啶都以反式构型吸附, 不存在构型的转化.

关键词: 锌电极, 2,2′-联吡啶, 表面增强拉曼光谱, 吸附, 构型转化

Abstract: Surface enhanced Raman spectroscopy (SERS) was employed to study the adsorption of 2,2′-bipyridine(2,2′-biPy) on an electrochemical roughened Zn electrode. The results suggested that 2,2′-biPy adsorbed on Zn electrode with relatively strong interaction. For a relative positive initial potential, the potential of the 2,2′-biPy adsorption was negatively moved because of the adsorption of Zinc oxide species, while at a relative negative potential, the adsorption of 2,2′-biPy blocked the adsorption of oxygen species, and thus the 2,2′-biPy and oxygen species exhibited a competitive adsorption on Zn electrode. Moreover, the adsorption configuration of 2,2′-biPy was dependent on the applied potential. It was adsorbed through cis conformation to the surface at －1.3 V, while through trans conformation at －1.4 V.

Key words: Zn electrode, 2,2′-bipyridine, Surface enhanced Raman spectroscopy, Adsorption, Conformational transition