Mapping molecular orientation and conformation at interfaces by surface nonlinear optics
Mapping molecular orientation and conformation at interfaces by surface nonlinear optics
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DOI：
10.1103/physrevb.59.12632
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发表时间：
1999-05-15
影响因子：
3.7
通讯作者：
Shen, YR
中科院分区：
文献类型：
--
作者：
Zhuang, X;Miranda, PB;Shen, YR
二阶非线性光学可用于定量确定界面上相当复杂的分子的化学键或子部分的方向，从而完全绘制出其方向和构象。作为一个具体的例子，我们研究了空气-水界面处的戊基氰基三联苯分子。我们通过光学二次谐波产生和红外-可见和频产生测量了分子所有三个部分（氰基头基、三联苯环和戊基链）的取向。获得了分子构型的定量一致的图像。该技术可以应用于其他方法失败的情况（例如，纯净液体的表面或掩埋界面）。 [S0163-1829(99)04119-3]。
Second-order nonlinear optics can be used to quantitatively determine the orientation of chemical bonds or submoieties of a fairly complicated molecule at an interface, and therefore completely map out its orientation and conformation. As a specific example, we have studied pentyl-cyanoterphenyl molecules at the air-water interface. We have measured the orientation of all three parts of the molecule (cyano head group, terphenyl ring, and pentyl chain) by optical second-harmonic generation and infrared-visible sum-frequency generation. A quantitatively consistent picture of the molecular configuration has been obtained. The technique can be applied to situations where other methods would fail (e.g., the surface of neat liquids or buried interfaces). [S0163-1829(99)04119-3].