The air-liquid interface of benzene, toluene, m-xylene, and mesitylene:: a sum frequency, Raman, and infrared spectroscopic study
The air-liquid interface of benzene, toluene, m-xylene, and mesitylene:: a sum frequency, Raman, and infrared spectroscopic study
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DOI：
10.1039/b301032p
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发表时间：
2003-01-01
期刊：
影响因子：
4.2
通讯作者：
Allen, HC
中科院分区：
文献类型：
--
作者：
Hommel, EL;Allen, HC
本文用宽带和频光谱、拉曼光谱和红外光谱研究了苯、甲苯、1，3-二甲苯和1，3，5-三甲苯的气液界面和液相。尽管小的超极化率，特别是零和近零的超极化率的苯和1，3，5-三甲基苯的振动共振和频率响应观察从这些表面。这些化合物的芳环在它们的空气-液体界面处的取向相对于表面平面倾斜。因此，平均而言，芳环的平面不位于界面平面中。将和频强度的平方根与拉曼的平方根乘以红外强度的平方根进行比较，提供了关于它们各自的空气-液体界面处的分子环境的附加信息。
The air-liquid interface and the liquid-phase of benzene, toluene, 1,3-dimethylbenzene, and 1,3,5-trimethylbenzene are studied using broad bandwidth sum frequency generation spectroscopy, Raman and infrared spectroscopy. A vibrationally resonant sum frequency response is observed from these surfaces in spite of the small hyperpolarizabilities, in particular, the zero and near-zero hyperpolarizabilities of benzene and 1,3,5-trimethylbenzene. The orientation of the aromatic rings of these compounds at their air-liquid interfaces is tilted relative to the surface plane. Thus, on average, the plane of the aromatic ring does not lie in the interfacial plane. Comparison of the square root of the sum frequency intensity to that of the Raman multiplied by the infrared intensity provides additional information about the molecular environment at their respective air-liquid interface.