Opt Express. 2023 Apr 10;31(8):13017-13027. doi: 10.1364/OE.481432.
The stimulus-responsive smart switching of aggregation-induced emission (AIE) features has attracted considerable attention in 4D information encryption, optical sensors and biological imaging. Nevertheless, for some AIE-inactive triphenylamine (TPA) derivatives, activating the fluorescence channel of TPA remains a challenge based on their intrinsic molecular configuration. Here, we took a new design strategy for opening a new fluorescence channel and enhancing AIE efficiency for (E)-1-(((4-(diphenylamino)phenyl)imino)methyl)naphthalen-2-ol. The turn-on methodology employed is based on pressure induction. Combining ultrafast and Raman spectra with high-pressure in situ showed that activating the new fluorescence channel stemmed from restraining intramolecular twist rotation. Twisted intramolecular charge transfer (TICT) and intramolecular vibration were restricted, which induced an increase in AIE efficiency. This approach provides a new strategy for the development of stimulus-responsive smart-switch materials.
刺激响应智能切换聚集诱导发射（AIE）特性在 4D 信息加密、光学传感器和生物成像方面引起了相当大的关注。然而，对于一些 AIE 非活性的三苯胺（TPA）衍生物，基于其内在的分子结构，激活 TPA 的荧光通道仍然是一个挑战。在这里，我们采用了一种新的设计策略，为（E）-1-（（4-（二苯基氨基）苯基）亚氨基）甲基）萘-2-醇开辟了一个新的荧光通道，并提高了 AIE 的效率。所采用的开启方法基于压力感应。结合超快和拉曼光谱以及原位高压表明，激活新的荧光通道源于抑制分子内扭转旋转。扭曲的分子内电荷转移（TICT）和分子内振动受到限制，从而导致 AIE 效率的提高。这种方法为开发刺激响应智能开关材料提供了一种新策略。
