Zhang Wei, Wang Na, Yu Yuan, Shan Yi-Min, Wang Bing, Pu Xue-Mei, Yu Xiao-Qi
Key Laboratory of Green Chemistry and Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu, 610064, P. R. China.
Chemistry. 2018 Apr 3;24(19):4871-4878. doi: 10.1002/chem.201705269. Epub 2018 Mar 2.
Aggregation-induced emission/aggregation-induced emission enhancement (AIE/AIEE) has recently attracted intense research, and a large number of AIE/AIEE luminogens (AIE/AIEEgens) have been constructed for application in diverse scientific fields. The AIE and AIEE effects have similar, but not identical, photophysical behaviors, which are closely related to molecular architectures. However, the current understanding of the inherent differences between AIE and AIEE is still obscure. Herein, a rational design strategy is reported for achieving AIE and AIEE effects by simply incorporating different substituents at the periphery of the same core skeleton. Experimental and theoretical studies on the series of compounds indicated that the restriction of intramolecular twisting motions or/and rotations plays an important role in regard to the corresponding AIE or AIEE behaviors. Moreover, compound 1 a (FW=203, Φ =80.9 %) was discovered as the lowest molecular weight AIEEgen with a high quantum yield in the solid state despite having no rotatable units. Compound 2 a also exhibited an AIEE effect with the minimum necessary structure (a single ring).
聚集诱导发光/聚集诱导发光增强(AIE/AIEE)近来引起了广泛的研究,大量的AIE/AIEE发光体(AIE/AIEEgens)已被构建用于各种科学领域。AIE和AIEE效应具有相似但不完全相同的光物理行为,这与分子结构密切相关。然而,目前对于AIE和AIEE之间内在差异的理解仍然模糊不清。在此,报道了一种合理的设计策略,即通过在同一核心骨架的外围简单引入不同的取代基来实现AIE和AIEE效应。对该系列化合物的实验和理论研究表明,分子内扭转运动或/和旋转的限制对于相应的AIE或AIEE行为起着重要作用。此外,化合物1a(FW = 203,Φ = 80.9%)被发现是固态下具有高量子产率的分子量最低的AIEEgen,尽管其没有可旋转单元。化合物2a也表现出具有最小必要结构(单环)的AIEE效应。