文献类型：期刊文献

中文题名：内源手性二芳基乙烯光调控手性液晶

英文题名：Photo-Regulation on Chiral Liquid Crystal by Intrinsic Chiral Diarylethene

作者：牛雪倩[1];李萌祺[1];朱为宏[1]

机构：[1]华东理工大学化学与分子工程学院,精细化工研究所,上海200237

年份：2025

卷号：51

期号：4

起止页码：437

中文期刊名：华东理工大学学报(自然科学版)

外文期刊名：Journal of East China University of Science and Technology

收录：;北大核心:【北大核心2023】；

基金：国家自然科学基金重点项目(22338006)。

语种：中文

中文关键词：光致变色;内源手性;二芳基乙烯;胆甾相液晶;螺旋扭曲力

外文关键词：photochromism;intrinsic chirality;diarylethene;cholesteric liquid crystals;helical twisting power

摘要：胆甾相液晶通常由手性分子加入非手性液晶自组装形成,因具有快速响应及选择性反射特性在光学领域具有重要应用,但目前仍缺乏具有双稳态及大螺旋扭曲力的内源手性光敏分子。本文引入具有优异热稳定性的内源手性光开关二芳基乙烯构建液晶调控体系。首先,基于位阻型二芳基乙烯桥合成了侧链连接苯甲醛的内源手性光开关αp-BPA,并研究其对液晶的调控性能,结果表明,o-BPA的螺旋扭曲力为155.43μm^(-1),变化值为94.72μm^(-1),其对液晶反射带调控范围高达530 nm。最后,通过对αp-BPA液晶体系进行光写入图案,实现了日常防伪以及光学衍射应用。
Cholesteric phase liquid crystals,which are usually formed by introducing chiral molecules into achiral nematic phase liquid crystals,have attracted much attention because of their excellent external stimulus responsivity,selective reflection,and dynamic modulation properties.However,rare photoswitches show high bistability,large helical twisting power,and intrinsic chirality.Therefore,this paper introduces an intrinsic chiral diarylethene photoswitch with excellent thermal stability to construct a liquid crystal modulation system.Based on sterically-hindered diarylethene,we synthesize an intrinsic chiral photoswitch ap-BPA with benzaldehyde groups to increase the steric hindrance effect,which in turn increases the helical twisting power.The basic optical properties of the photoswitch are systematically tested,and the results show that the photoswitch possesses excellent photoresponsive properties,fatigue resistance and thermal stability.Furthermore,the intrinsic chiral photoswitch is mixed with nematic liquid crystals to successfully construct a dynamically tunable liquid crystal system,and it is shown that the photoswitch exhibits a large helical twisting power(HTP)value of 155.43μm^(-1),with a variation of 94.72μm^(-1).This represents a significant performance improvement compared to BBTE.What’s more,the tuning wavelength ranges of the liquid crystal systems of the molecule can span from the visible region to the near-infrared region,with a width of up to 530 nm.Finally,by performing optical writing patterns on the ap-BPA liquid crystal system,applications in daily anti-counterfeiting and optical diffraction are achieved.