Photoinvertible Chiral Liquid Crystal that Affords Helicity‐Controlled Aromatic Conjugated Polymers
Photoinvertible Chiral Liquid Crystal that Affords Helicity‐Controlled Aromatic Conjugated Polymers
复制标题
提供螺旋控制芳族共轭聚合物的光可逆手性液晶
DOI：
10.1002/adom.202000936
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发表时间：
2020-08
影响因子：
9
通讯作者：
Satoru Yoshida;Santa Morikawa;Kenta Ueda;Masato Hidaka;K. Kaneko;K. Kaneko;T. Hanasaki;K. Akagi
中科院分区：
文献类型：
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作者：
Satoru Yoshida;Santa Morikawa;Kenta Ueda;Masato Hidaka;K. Kaneko;K. Kaneko;T. Hanasaki;K. Akagi
通过将光响应双苯并噻吩乙烯部分与轴向手性联萘部分连接来合成光可逆手性化合物，并用作手性掺杂剂来制备光可逆手性向列液晶（N*-LC）场。随后，在N*-LC场中实现了乙撑二氧噻吩（EDOT）的电化学聚合以合成螺旋聚（乙撑二氧噻吩）（H-PEDOT）。 H-PEDOT不仅在偏光显微镜下表现出类似于N*-LC指纹纹理的螺旋形貌，而且在圆二色光谱中表现出双峰Cotton效应，表明H-PEDOT主链形成了螺旋π堆叠结构。此外，双符号Cotton效应的符号严格由N*-LC的螺旋度决定。目前的N*-LC是第一个表现出光可逆手性的反应场，具有极高的抗疲劳性，可作为电化学聚合的不对称介质，从而实现共轭聚合物的动态螺旋度控制。
Photoinvertible chiral compounds are synthesized by linking a photoresponsive bisbenzothienylethene moiety with an axially chiral binaphthyl moiety and used as chiral dopants to prepare a photoinvertible chiral nematic liquid crystal (N*‐LC) field. Subsequently, electrochemical polymerizations of ethylenedioxythiophene (EDOT) in the N*‐LC field to synthesize helical poly(ethylenedioxythiophene)s (H‐PEDOTs) are achieved. The H‐PEDOTs show not only spiral morphologies resembling the fingerprinted texture of N*‐LC in polarizing optical microscope but also bisignate Cotton effects in circular dichroism spectra, indicating the formation of a helically π‐stacked structure in terms of the main chains of H‐PEDOT. In addition, the signs of the bisignate Cotton effect are strictly determined by the helicity of the N*‐LC. The present N*‐LC is the first reaction field exhibiting photoinvertible chirality with extremely high fatigue resistance and serves as an asymmetric medium for electrochemical polymerization, leading to dynamic helicity control of conjugated polymers.