Visible‐Light‐Driven Halogen Bond Donor Based Molecular Switches: From Reversible Unwinding to Handedness Inversion in Self‐Organized Soft Helical Superstructures
作者:Hao Wang、Hari Krishna Bisoyi、Bing‐Xiang Li、Michael E. McConney、Timothy J. Bunning、Quan Li
DOI:10.1002/anie.201913977
日期:2020.2.10
visible light of different wavelengths. These chiral molecular switches induce photoresponsive helical superstructures, that is, cholesteric liquid crystals, when doped into the commercially available room-temperature achiral liquid crystal host 5CB, which also acts as a halogen-bond acceptor. The induced helical superstructure containing the molecular switch with terminal iodo atoms exhibits visible-light-driven
可见光驱动的分子开关具有可逆调制自组织软材料功能的特性,目前在基础科学研究和技术应用中受到了广泛的追捧。本文报道了两种新颖的基于卤素键供体的手性分子开关的设计和合成,所述手性分子开关在暴露于不同波长的可见光时表现出可逆的光异构化。当将这些手性分子开关掺杂到还用作卤素键受体的可商购的室温非手性液晶主体5CB中时,它们诱导光响应性螺旋超结构,即胆甾型液晶。包含具有末端碘原子的分子开关的诱导螺旋超结构表现出可见光驱动的可逆展开,即,胆甾型向列相转变。有趣的是,带有末端溴原子的分子开关在用不同波长的可见光照射时赋予螺旋上层结构可逆的旋性反转。这种由卤素键供体分子开关实现的可见光驱动,可逆惯性操作反转是前所未有的。