Supramolecular approaches toward the fabrication of functional materials and systems have been an enabling endeavor. Recently, halogen bonding has been harnessed as a promising supramolecular tool. Herein we report the synthesis and characterization of a novel halogen‐bonded light‐driven axially chiral molecular switch. The photoactive halogen‐bonded chiral switch is able to induce a self‐organized, tunable helical superstructure, that is, cholesteric liquid crystal (CLC), when doped into an achiral liquid crystal (LC) host. The halogen‐bonded switch as a chiral dopant has a high helical twisting power (HTP) and shows a large change of its HTP upon photoisomerization. This light‐driven dynamic modulation enables reversible selective reflection color tuning across the entire visible spectrum. The chiral switch also displays a temperature‐dependent HTP change that enables thermally driven red, green, and blue (RGB) reflection colors in the self‐organized helical superstructure.

中文翻译：

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在卤素键合手性分子开关的作用下，自组织螺旋上层结构中的光化学和热驱动全色反射

用于制造功能性材料和系统的超分子方法一直是一项令人鼓舞的努力。近来，卤素键已被用作有前途的超分子工具。本文中我们报道了一种新型的卤素键合光驱动轴向手性分子开关的合成与表征。当掺杂到非手性液晶（LC）主体中时，光敏卤素键合手性开关能够诱导自组织的可调谐螺旋超结构，即胆甾型液晶（CLC）。卤素键开关作为手性掺杂剂，具有高的螺旋扭曲力（HTP），并且在光异构化后显示出其HTP的较大变化。这种光驱动的动态调制可在整个可见光谱范围内进行可逆的选择性反射颜色调整。