N-甲基咪唑与2,2’-联吡啶在铜表面共吸附的SERS研究  

Surface Enhanced Raman Spectroscopic Studies on the Coadsorption of N-Methylimidazole and 2,2'-Bipyridine at Cu Electrode

作　　者：韦萍洁[1] 袁亚仙[1] 顾仁敖[1] 姚建林[1] 

机构地区：[1]苏州大学化学化工学院,江苏苏州215123

出　　处：《光谱学与光谱分析》2008年第12期2868-2871,共4页Spectroscopy and Spectral Analysis

基　　金：国家自然科学基金项目(20503019;20573076);江苏省自然科学基金项目(BK2005032)资助

摘　　要：采用电化学现场表面增强拉曼光谱(SERS)分别研究了非水体系中N-甲基咪唑(NMIM),2,2’-联吡啶(2,2-’bipy)在铜电极表面的吸附行为以及两者的共吸附行为。结果表明在非水体系中,NMIM可在很宽的电位区间内稳定地吸附在金属表面,而2,2-’bipy在一个相对较窄的电位区间内能稳定地吸附在金属表面。当两者共存时存在竞争吸附和共吸附行为,较负的电位下主要以NMIM吸附为主,在略偏负的电位区间内以2,2-’bipy吸附为主,而正电位区间两者在金属表面共吸附,NMIM倾斜吸附在金属表面,而2,2’-bipy以顺式结构垂直吸附在金属表面。The adsorption behavior and coadsorption of N-methylimidazole（NMIM） and 2,2＇-bipyridine（2,2＇-bipy） at copper electrode were investigated by in situ electrochemical surface enhanced Raman spectroscopy（SERS） in the acetonitrile solution.In situ SERS studies revealed that NMIM can adsorb stably onto Cu electrode in a quite different potential range,but the potential range for adsorbing 2,2＇-bipy is narrow.With the introduction of 2,2＇-bipy into the solution,the SERS could be divided into three parts：（a） under-0.8 V,NMIM molecule adsorption,（b） near the open potential,2,2＇-bipy molecule adsorption with cis-conformation,（c） at positive potential region,both NMIM and 2,2＇-bipy were coadsorbed at Cu surface,and the SERS data also suggested that the NMIM bound to copper surface with a tilted orientation,while the 2,2＇-bipy was adsorbed through cis-conformation to the surface.

关 键 词：铜 NMIM 2 2-'bipy 表面增强拉曼光谱 共吸附 

分 类 号：O561.3[理学—原子与分子物理]