Multi-stimuli-responsive materials, which can show color/fluorescence change in response to external chemical or physical stimuli, have received increasing attention due to the capacities for facile realization of multifunctional sensing. Herein, we presented a Et₂N-substituted salicylaldehyde Schiff base compound (DDHAC) with multi-stimuli-responsive behaviors. An investigation of the photophysical properties in solution demonstrated DDHAC was an excited-state intramolecular proton transfer (ESIPT) and aggregation-induced emission (AIE) active molecule. Owing to structural flexibility from salicylaldehyde Schiff base, the compound displayed reversible mechanochromic and thermochromic behavior, which were associated with the crystalline-to-amorphous and crystalline-to-crystalline, respectively. Moreover, the Et₂N group endowed DDHAC with the capability that response of protonation. Due to its protonation effect, DDHAC could serve as a unique optical probe for discriminating CHCl₃ from organic solvents assisted by UV irradiation. The selectivity was attributed to the interaction of DPPTP with HCl gas from photodecomposition product of chloroform.

由于能够轻松实现多功能传感，多刺激响应材料可以响应外部化学或物理刺激而显示颜色/荧光变化，因此受到越来越多的关注。在这里，我们提出了一个 Et ₂具有多刺激响应行为的 N-取代水杨醛席夫碱化合物 (DDHAC)。溶液中光物理性质的研究表明 DDHAC 是一种激发态分子内质子转移 (ESIPT) 和聚集诱导发射 (AIE) 活性分子。由于水杨醛席夫碱的结构灵活性，该化合物表现出可逆的机械变色和热致变色行为，分别与晶体到非晶态和晶体到晶体相关。此外，Et ₂ N基团赋予了DDHAC响应质子化的能力。由于其质子化效应，DDHAC 可以作为一种独特的光学探针来区分 CHCl ₃有机溶剂在紫外线照射的辅助下。选择性归因于 DPPTP 与来自氯仿光分解产物的 HCl 气体的相互作用。