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化学学报
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化学学报 ›› 2007, Vol. 65 ›› Issue (15): 1437-1442. 上一篇    下一篇

研究论文

异烟酸在碱性溶液中金电极上的现场表面增强振动光谱研究

薛晓康1, 霍胜娟1, 严彦刚1, 王金意1, 姚建林2, 蔡文斌*,1   

  1. (1复旦大学化学系上海市分子催化和功能材料重点实验室 上海 200433)
    (2苏州大学化学化工学院 苏州 215006)
  • 投稿日期:2006-10-30 修回日期:2007-03-19 发布日期:2007-08-14
  • 通讯作者: 蔡文斌

In situ Surface-Enhanced Vibrational Spectroscopies on Isonicotinic Acid Adsorbed on Gold Electrodes in Alkaline Solutions

XUE Xiao-Kang1; HUO Sheng-Juan1; YAN Yan-Gang1; WANG Jin-Yi1; YAO Jian-Lin2; CAI Wen-Bin*,1   

  1. (1 Shanghai Key Laboratory for Molecular Catalysis and Innovative Materials and Department of Chemis-try, Fudan University, Shanghai 200433)
    (2 Department of Chemistry, Suzhou University, Suzhou 215006)
  • Received:2006-10-30 Revised:2007-03-19 Published:2007-08-14
  • Contact: CAI Wen-Bin

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应用表面增强红外吸收光谱法、循环伏安法和微分电容法研究了0.1 mol•L－1 KClO4和0.1 mol•L－1 KCl碱性化溶液(pH 10)中, 异烟酸(INA)在Au电极表面的吸附取向和结构. 结果表明: －0.5～0.2 V (vs. SCE)间INA阴离子(INA－)通过其羧酸根上的两个氧原子垂直吸附在Au电极表面; 特性吸附Cl－对上述吸附结构无实质影响. 进一步的表面增强拉曼光谱的测试表明即使在－0.8～－0.5 V, 极少量吸附的INA－很可能仍维持上述基本构型.

关键词: 表面增强红外吸收光谱, 异烟酸, Au电极, 吸附构型, 表面增强拉曼光谱

Surface-enhanced infrared absorption spectroscopy (SEIRAS) in conjunction with cyclic voltammetry and differential capacitance measurement has been applied to investigate the adsorption configuration of isonicotinate (INA－) species on Au electrodes in alkalinized 0.1 mol•L－1 KClO4 and 0.1 mol•L－1 KCl solutions (pH 10). The results indicate that INA－ is nearly vertically adsorbed on the Au surface through the two oxygen atoms of its carboxylate group between －0.5 and 0.2 V (vs. SCE). The presence of Cl－ in a supporting electrolyte dose not change the adsorption configuration of INA－ on Au electrodes. Further supporting information from surface-enhanced Raman spectroscopy suggests that at negative potentials from －0.8 to －0.5 V, INA－ species adsorbed on Au electrode of a very low coverage is likely to remain the nearly same configuration as that revealed at more positive potentials.

Key words: surface-enhanced infrared absorption spectroscopy, isonicotinic acid, Au electrode, adsorption configuration, surface-enhanced Raman spectroscopy