Molecular Materials and Nanosystems, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands.
J Phys Chem B. 2009 Oct 29;113(43):14165-71. doi: 10.1021/jp907297y.
The anisotropic dielectric tensor of chiral poly[9,9-bis((3S)-3,7-dimethyloctyl)-2,7-fluorene] is determined via variable angle spectroscopic ellipsometry and circular dichroism spectroscopy. The uniaxial anisotropy indicates a high in-plane alignment of polymer chains in the thin film. Chirality of the polymer results in small but nonzero off-diagonal matrix elements in the dielectric tensor, indicating a helical interchain organization in the vertical direction. This method for determining the dielectric tensor appears to be self-consistent when checked against various theoretical models for the optical activity in the reflection of light. The dielectric constants for the chiral polyfluorene are compared to those for an achiral polyfluorene.
手性聚[9,9-双((3S)-3,7-二甲基辛基)-2,7-芴]的各向异性介电张量通过变角光谱椭圆偏振和圆二色性光谱确定。单轴各向异性表明薄膜中聚合物链具有较高的面内取向。聚合物的手性导致介电张量中的非对角矩阵元素很小但不为零，表明在垂直方向上存在螺旋的分子间排列。通过与光反射的各种理论模型对照，这种确定介电张量的方法似乎是自洽的。手性聚芴的介电常数与非手性聚芴的介电常数进行了比较。
