【摘要】 采用表面增强拉曼光谱技术研究了苯硫酚及其功能衍生物 ,对巯基苯胺和对苯硫酚在粗糙银电极上的吸附取向特征。结果表明 :虽然 3种分子的结构类似 ,但对位取代基直接影响各分子在电极上的吸附取向。 3种分子都通过硫原子与银电极形成S Ag键吸附在电极表面。苯硫酚采用倾斜的方式吸附 ,使得苯环与基底间表现一定程度的相互作用 ;吸附的对巯基苯胺则因质子化氨基间的静电相互作用而完全垂直于电极表面 ;而对苯硫酚则采用平躺于电极表面的方式吸附 ,致使苯环π体系与基底银之间具有较强的相互作用更多还原

【Abstract】 The adsorption orientations of benzene derivatives, thiophenol, 4-aminothiophenol and 1,4-dithiobenzene, were investigated on the surfaces of roughened Ag electrodes by using surface-enhanced Raman spectroscopy. The results demonstrate that the orientations of the molecules are affected by the substituent on the benzene ring, despite of the similarity in the molecular structures. All the molecules were adsorbed via the sulfur atom by forming the Ag-S bond. The ring of thiophenol is tilted to the normal of the electrode surface, leading to certain extent of interaction between the benzene ring and the electrode surface. 4-Aminothiophenol adopts a standing-up orientation, due to the electrostatic interaction between the protonated amine groups, whereas 1,4-dithiobenzene lies flat on the electrode surface, resulting in a strong substrate-π ring interaction.更多还原