Multistimuli-Responsive Enaminitrile Molecular Switches Displaying H<sup>+</sup>-Induced Aggregate Emission, Metal Ion-Induced Turn-On Fluorescence, and Organogelation Properties
作者:Yansong Ren、Sheng Xie、Erik Svensson Grape、A. Ken Inge、Olof Ramström
DOI:10.1021/jacs.8b09843
日期:2018.10.24
turned off by addition of competitive coordination. The acid/base-activated switching, together with the induced AIE-effects, further enabled the accomplishment of a responsive superorganogelator. In nonpolar solvents, a blue-fluorescent supramolecular gel was formed upon addition of acid to the E-isomer suspension. The gelation could be reversed by addition of base, and the overall, reversible process could
展示了聚合诱导发射 (AIE)、荧光开启效应和超凝胶特性的多刺激响应基于烯腈的配置开关。E-异构体在中性/碱性溶液中占主导地位(> 97%),并且在添加酸/碱时,结构在烯胺C = C键周围进行精确控制的转换。响应于溶液和固态中的不同外部输入,观察到特定的荧光输出。响应 H+,构型转换导致在溶液中完全形成非发射性 Z-H+-异构体,但在固态下显示深蓝色至蓝色荧光(ΦF 高达 0.41)。响应溶液状态的 CuII,E-异构体表现出强烈的、开启的蓝绿色荧光,这可以通过添加竞争性协调来关闭。酸/碱激活的转换以及诱导的 AIE 效应进一步实现了响应性超有机凝胶剂的实现。在非极性溶剂中,向 E 异构体悬浮液中加入酸后会形成蓝色荧光超分子凝胶。通过添加碱可以逆转凝胶化,并且整个可逆过程可以重复至少五个循环。