2,2′-联吡啶与锌电极作用的表面增强拉曼光谱研究

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.

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

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.