文献类型：期刊文献

中文题名：氢键对位阻型二芳基乙烯有机凝胶性能影响

英文题名：Effect of Hydrogen Bond on the Performance of Organic Gel Based on Sterically-Hindered Diarylethenes

作者：沈海欣[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：2023

卷号：49

期号：1

起止页码：1

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：Scopus;北大核心:【北大核心2020】；CSCD:【CSCD_E2023_2024】；

基金：国家基金委重点项目(201636002)。

语种：中文

中文关键词：光致变色;二芳基乙烯;有机凝胶;聚集诱导发光;氢键

外文关键词：photochromism;diarylethene;organic gel;aggregation induced emission;hydrogen bond

摘要：基于位阻型二芳基乙烯,合成了两种光响应有机凝胶分子ap-BAM和ap-YJ,其荧光性能和凝胶性能可通过光照进行有效可逆调控,并且两种分子在溶液中均具有优异的光响应性能。目标分子ap-BAM可通过氢键结合单元在常温下形成凝胶,而参比分子ap-YJ只能在低温下形成凝胶。研究表明两种凝胶分子均具有聚集诱导发光性能,在凝胶开环态均表现出较强的荧光性能;当受到紫外光照射后,则由凝胶态转化为溶液态,并发生了荧光淬灭。扫描电子显微镜测试结果表明,ap-BAM凝胶形成了致密的三维多孔网络,而ap-YJ凝胶仅形成了致密薄膜,表明具有氢键结构单元的ap-BAM凝胶具有更好的凝胶性能。
Photo-responsive organic functional gels have drawn the increasing attention due to their functional diversity. Based on sterically-hindered diarylethenes, we synthesized two photoresponsive organic gels, ap-BAM and ap-YJ, which exhibited reversible fluorescence and gelation properties upon light irradiation. Both organic gel materials show high conversion ratio and fatigue resistance in the solution state. Meanwhile, ap-BAM with hydrogenbonding network can convert into the gel state at room temperature, and the reference system of ap-YJ can only convert into gels at a low temperature(-10 ℃). In addition, due to the aggregation-induced emission(AIE) property of the sterically hindered diarylethene core, the open form of the gel exhibits a relatively strong fluorescence. Upon irradiated by UV light, two photoresponsive gels transfer from gel to solution state along with a quenched fluorescence. This can be attributed to an increase in the rigidity of the closed form and a steric hindrance of the methyl groups, which diminishes intermolecular interactions. The morphology of the gels is characterized by scanning electron microscopy(SEM). A denser gelatin with three-dimensional porous network can be found in ap-BAM system. However, ap-YJ forms just a dense film, indicating that the hydrogen-bonding network in the ap-BAM gel system facilitates the gelation.