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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 electrochemical surface-enhanced Raman spectroscopy was used to study the adsorption behavior and surface reaction of phenylacetylene on the gold electrode.Variation of the Raman spectra at the negative potential indicated that the acetylene side of the acetylene molecule bonds with the metal electrode and the molecule is vertically adsorbed On the surface of the gold electrode, the adsorption orientation of the molecule on the surface of the electrode did not change with the potential in the negative potential region studied.The electrochemical field spectroscopy showed that the molecular weight of phenylacetylene shifted negatively with potential, and the carbon-carbon triple bond was hydrogenated Reduction.Compared with the field-enhanced surface Raman spectra of styrene, it was found that in the potential range of -0.6V to -1.2V, phenylacetylene undergoes intermediate steps to produce styrene and finally is completely hydrogenated to styrene.