Inhomogeneous and Spontaneous Formation of Chirality in the Langmuir Monolayer of Achiral Molecules at the Air/Water Interface Probed by In Situ Surface Second Harmonic Generation Linear Dichroism
Inhomogeneous and Spontaneous Formation of Chirality in the Langmuir Monolayer of Achiral Molecules at the Air/Water Interface Probed by In Situ Surface Second Harmonic Generation Linear Dichroism
复制标题
原位表面二次谐波产生线性二向色性探测空气/水界面处非手性分子朗缪尔单层中手性的不均匀和自发形成
DOI：
10.1021/jp810509u
复制
发表时间：
2009-02
影响因子：
3.7
通讯作者：
Guo, Yuan
中科院分区：
文献类型：
--
作者：
Wang, Hong-fei;Zheng, De-sheng;Liu, Ming-hua;Rao, Yi;Xu, Yan-yan;Guo, Yuan
The chirality of the Langmuir monolayer at different surface densities formed with achiral 5-octadecyloxy-2-(2-pyridylazo)phenol (PARC18) molecules at the air/water interface was measured with the in situ optical second harmonic generation linear dichroism (SHG-LD) technique. Using the s-polarization detection curve in SHG-LD, the degree of chiral excess (DCE) in the Langmuir monolayer can be determined as accurately as 2%. We found that the PARC18 Langmuir monolayer was chiral and the degree of chirality varied randomly between the two opposite chiral states in the same monolayer at different surface densities and at different locations, suggesting coexistence of the various enantiomers simultaneously in the PARC18 Langmuir monolayer. This inhomogeneity of the monolayer chirality was independent of the laser power and wavelength as well as the surface density and the surface pressure, and the chiral domains distributed randomly in the Langmuir monolayer. We also found that the chirality in the PARC18 Lan...
