A photoresponsive planar chiral azobenzene dopant with high helical twisting power
A photoresponsive planar chiral azobenzene dopant with high helical twisting power
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DOI：
10.1039/c4tc01851f
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发表时间：
2014-11-21
影响因子：
6.4
通讯作者：
Tamaoki, Nobuyuki
中科院分区：
文献类型：
--
作者：
Kim, Yuna;Tamaoki, Nobuyuki
合成了作为光子模式手性开关的平面手性分子，用于基于掺杂手性向列液晶的自组装超结构的可逆控制。该手性开关由双己基取代的二苯基萘和光致异构偶氮苯单元通过乙烯间隔基以环状连接而成。介晶单元的双己基取代促进了手性转移到主体液晶介质，从而导致高初始螺旋扭转功率（HTP）以及手性掺杂剂的光异构化导致的 HTP 的巨大变化。在非常低的掺杂浓度下，实现了RGB反射颜色的可逆调节和胆甾型液晶表面上微玻璃棒的旋转运动控制。
A planar chiral molecule as a photon-mode chiral switch was synthesized for the reversible control of self-assembled superstructures based on doped chiral nematic liquid crystals. The chiral switch is composed of bis-hexyl substituted diphenylnaphthalene and a photoisomerizing azobenzene unit connected by ethylene spacers in a cyclic manner. Bis-hexyl substitution to the mesogenic unit promoted the chirality transfer to the host LC medium resulting in a high initial helical twisting power (HTP) and a large change in HTP by photo-isomerization of the chiral dopant. At very low doping concentrations, both reversible tuning of RGB reflection colors and rotation motion control of micro glass rods on the cholesteric liquid crystal surface were achieved.