Nematic-to-columnar mesophase transition by in situ supramolecular polymerization
Nematic-to-columnar mesophase transition by in situ supramolecular polymerization
复制标题
原位超分子聚合向列相到柱状中间相转变
DOI：
10.1126/science.aan1019
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发表时间：
2019
期刊：
影响因子：
56.9
通讯作者：
Aida Takuzo
中科院分区：
文献类型：
--
作者：
Yano Keiichi;Itoh Yoshimitsu;Araoka Fumito;Watanabe Go;Hikima Takaaki;Aida Takuzo
盘状和棒状分子在共组装中是不相容的，因为前者倾向于一维堆积，而后者倾向于平行排列。由于这种类型的不相容在凝聚相中可能更加明显，不同形状的分子通常相互排斥。我们报道了在含有棒状分子的向列型液晶中，盘状手性单体的超分子聚合导致有序增加的中间相转变为具有核壳柱状几何结构的单一中间相。这种液晶材料对外加电场的响应速度很快，导致单向柱状有序。此外，只需使用可光电异构化的棒状模块，就可以将其模块化定制为光电响应。模块化策略允许将不同的功能协同集成到复杂的动态架构中。
Disk- and rod-shaped molecules are incompatible in coassembly, as the former tend to stack one-dimensionally whereas the latter tend to align in parallel. Because this type of incompatibility can be more pronounced in condensed phases, different-shaped molecules generally exclude one another. We report that supramolecular polymerization of a disk-shaped chiral monomer in nematic liquid crystals comprising rod-shaped molecules results in order-increasing mesophase transition into a single mesophase with a core-shell columnar geometry. This liquid crystalline material responds quickly to an applied electric field, resulting in unidirectional columnar ordering. Moreover, it can be modularly customized to be optoelectrically responsive simply by using a photoisomerizable rod-shaped module. The modular strategy allows for cooperative integration of different functions into elaborate dynamic architectures.