Cyano and Isocyano-substituted Tetraphenylethylene with AIE Behavior and Mechanoresponsive Behavior
Cyano and Isocyano-substituted Tetraphenylethylene with AIE Behavior and Mechanoresponsive Behavior
复制标题
具有 AIE 行为和机械响应行为的氰基和异氰基取代的四苯乙烯
DOI：
10.14102/j.cnki.0254-5861.2021-0049
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发表时间：
2022
影响因子：
2.2
通讯作者：
Cai Hu
中科院分区：
文献类型：
--
作者：
Liu Qing;Yue Shusheng;Yan Zhangqiang;Xie Yongfa;Cai Hu
同时具有AIE行为和机械响应行为的双功能材料由于其在机械传感器、光存储、固态光电器件和生物成像系统等方面的应用前景而引起人们的广泛关注。以四苯乙烯（TPE）为核的AIEgens是许多荧光功能材料的基本结构单元。本文在TPE骨架上引入氰基和异氰基吸电子基团，形成四氰基苯乙烯（TPE-CN）和四异氰基苯乙烯（TPE-NC）。其结构经核磁共振、质谱和单晶X-射线衍射确证。这两种异构体反映了溶液状态下的聚集诱导发光（AIE）性质和固体状态下的力致变色行为。有趣的是，它们的发光强度，量子产率和荧光寿命在固态下有一个明显的增加研磨。通过理论计算，阐明了这两种化合物在光学性质上的差异。机械致变色机制也通过粉末X射线测量得到了深入的解释。
Dual-functional materials with AIE behavior and mechanoresponsive behavior have attracted considerable attention due to their promising applications in mechano-sensors, optical storage, solid-state optoelectric devices and bioimage systems. AIEgens bearing tetraphenylethylene (TPE) core become elementary building blocks in many fluorescent functional materials. In this article, cyanoand isocyano-electronic withdrawing groups are incorporated with TPE skeleton to form tetracyanophenylethylene (TPE-CN) and tetraisocyanophenylethylene (TPE-NC). Their structures are confirmed by NMR, Mass Spectra and single crystal X-ray measurement. These two isomers reflect aggregation-induced emission (AIE) property in solution state and mechanochromic behavior in solid state. Interestingly, their luminescent intensities, quantum yields and fluorescent lifetime in solid state have an obvious increase upon grinding. The theoretical calculation of these two compounds clarify their difference in optical properties. The mechanochromic mechanism is also intensively explained by powder X-ray measurements.