摘要
采用电化学现场表面增强拉曼光谱研究了苯乙炔在金电极上的吸附行为及表面反应过程.负电位下拉曼光谱的变化表明,苯乙炔分子的炔端碳与金属电极成键,分子垂直吸附于金电极表面.在所研究的负电位区间内,分子在电极表面的吸附取向并未随电位发生改变.电化学现场光谱研究表明,苯乙炔分子随电位负移,碳碳叁键被加氢还原.通过对比苯乙烯的现场表面增强拉曼光谱发现,在-0.6V至-1.2V的电位区间内,苯乙炔经过中间步骤生成苯乙烯,最终被完全加氢为苯乙烷.
The surface reaction and adsorption behavior of phenylacetylene adsorbed on a gold electrode were studied by means of in situ electrochemical surface-enhanced Raman spectroscopy （SERS）. The results showed that phenylacetylene would become phenylacetylide and it was perpendicular with respect to the gold surface. The adsorption mode of phenylacetylide did not prominently change in a certain potential region. The change in the spectral features of SER spectra detected at more negative potential revealed that an addition reaction occurred with the carbon-carbon triple bond of phenylacetylene. Compared with SERS of styrene on a gold electrode, during the potential region of --0.6 V to -- 1.2 V, there might be styrene produced on the surface of the electrode. Finally, it would be reduced to ethylbenzene.
出处
《化学学报》
SCIE
CAS
CSCD
北大核心
2009年第2期134-138,共5页
Acta Chimica Sinica
基金
国家自然科学基金(Nos. 20503019
20573076)
江苏省自然科学基金(No. BK2005032)
教育部博士点(No. 20050285019)
江苏省‘六大人才高峰’基金资助项目.
关键词
苯乙炔
金电极
吸附
表面增强抟曼光谱
表面反应
phenylacetylene
gold electrode
adsorption
surface-enhanced Raman spectroscopy
surface reaction
