Multistimuli-responsive enaminitrile-based configurational switches displaying aggregation-induced emission (AIE), fluorescence turn-on effects, and supergelation properties are presented. The E-isomers dominated (>97%) in neutral/basic solution, and the structures underwent precisely controlled switching around the enamine C═C bond upon addition of acid/base. Specific fluorescence output was observed in response to different external input in the solution and solid states. In response to H+, configurational switching resulted in complete formation of the nonemissive Z-H+-isomers in solution, however displaying deep-blue to blue fluorescence (ΦF up to 0.41) in the solid state. In response to CuII in the solution state, the E-isomers exhibited intense, turn-on, blue-green fluorescence, which could be 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 be repeated at least five cycles.

中文翻译：

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显示 H+ 诱导的聚集发射、金属离子诱导的开启荧光和有机凝胶特性的多刺激响应 Enaminitrile 分子开关

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。