Reaction field induction self-amplification optical activity during polymerization in liquid crystal
Reaction field induction self-amplification optical activity during polymerization in liquid crystal
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DOI：
10.1080/15421406.2022.2073421
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发表时间：
2022-05
影响因子：
0.7
通讯作者：
H. Goto
中科院分区：
文献类型：
--
作者：
H. Goto
摘要合成了一种既具有手性诱导作用又具有聚合活性的单体。将该化合物加入到NH4LC中诱导形成手性形式的NH4LC液晶。随后的电化学聚合的单体产生的旋光聚合物与螺旋结构，证实了圆二色性（CD）和旋光色散测量。然而，将手性单体添加到各向同性非LC溶液中并随后聚合得到没有明显光学活性的产物。这些结果表明，单体的聚合反应在一个稳定的环境中允许形成具有高光学活性的聚合物。通过偏光显微镜的表面观察证实了从矩阵LC的形态印迹。手性单体改变周围环境，以生长成更高度有序的螺旋结构。作为环境的基质LC在聚合期间随着单体的螺旋生长而放大光学活性。图形摘要
Abstract A monomer having both chiral induction from nematic liquid crystal (LC) to cholesteric LC and polymerization activity was prepared. Addition of the compound to nematic LC induced the formation of a cholesteric liquid crystal in its chiral form. Subsequent electrochemical polymerization of the monomer produced an optically active polymer with a helical structure as confirmed by circular dichroism (CD) and optical rotatory dispersion measurements. While, the addition of the chiral monomer to an isotropic non-LC solution, and subsequent polymerization resulted a product with no clear optical activity. These results suggest that polymerization of the monomer in a cholesteric environment allows the formation of a polymer with high optical activity. Morphological imprinting from the matrix LC was confirmed by surface observation through polarizing optical microscopy. The chiral monomer changes the surrounding environment to grow into a more highly ordered helical structure. The matrix LC as the environment amplifies the optical activity with helical growth of the monomer during polymerization. Graphical Abstract