Iwai Riki, Suzuki Satoshi, Sasaki Shunsuke, Sairi Amir Sharidan, Igawa Kazunobu, Suenobu Tomoyoshi, Morokuma Keiji, Konishi Gen-Ichi
Department of Chemical Science and Engineering, Tokyo Institute of Technology, 2-12-1-H-134 O-okayama, Meguro-ku, Tokyo, 152-8552, Japan.
Fukui Institute for Fundamental Chemistry, Kyoto University, Takano-Nishibiraki-cho 34-4, Sakyou-ku, Kyoto, 606-8103, Japan.
Angew Chem Int Ed Engl. 2020 Jun 22;59(26):10566-10573. doi: 10.1002/anie.202000943. Epub 2020 Mar 26.
To broaden the application of aggregation-induced emission (AIE) luminogens (AIEgens), the design of novel small-molecular dyes that exhibit high fluorescence quantum yield (Φ ) in the solid state is required. Considering that the mechanism of AIE can be rationalized based on steric avoidance of non-radiative decay pathways, a series of bridged stilbenes was designed, and their non-radiative decay pathways were investigated theoretically. Bridged stilbenes with short alkyl chains exhibited a strong fluorescence emission in solution and in the solid state, while bridged stilbenes with long alkyl chains exhibited AIE. Based on this theoretical prediction, we developed the bridged stilbenes BPST[7] and DPB[7], which demonstrate excellent AIE behavior.
为了拓宽聚集诱导发光（AIE）发光体（AIEgens）的应用范围，需要设计出在固态下具有高荧光量子产率（Φ）的新型小分子染料。考虑到AIE的机制可以基于对非辐射衰变途径的空间位阻回避来进行合理解释，我们设计了一系列桥连芪类化合物，并对其非辐射衰变途径进行了理论研究。短烷基链的桥连芪类化合物在溶液和固态中均表现出强烈的荧光发射，而长烷基链的桥连芪类化合物则表现出AIE特性。基于这一理论预测，我们开发了桥连芪类化合物BPST[7]和DPB[7]，它们展现出优异的AIE行为。
