Development of benzylidene-methyloxazolone based AIEgens and decipherment of their working mechanism
作者:Meijuan Jiang、Zikai He、Yilin Zhang、Herman H. Y. Sung、Jacky W. Y. Lam、Qian Peng、Yongli Yan、Kam Sing Wong、Ian D. Williams、Yongsheng Zhao、Ben Zhong Tang
DOI:10.1039/c7tc02582c
日期:——
have been prepared and are found to be AIE-active. Their solutions are weakly emissive and their aggregation or solid states are highly emissive. Although these compounds readily undergo efficient E/Z isomerization (EZI) upon UV irradiation in solution, the intramolecular rotation around the double bond and phenyl roation around the single bond serve as the key non-radiative decay channels to dissipate
基于绿色荧光蛋白发色团亚苄基-甲基恶唑酮(BMO)的类似物,已制备了一系列具有额外苯基的荧光团BMO-PH,BMO-PF,BMO-PM和BMO-PC。主动AIE。它们的溶液是弱发射的,它们的聚集或固态是高发射的。尽管这些化合物容易有效地E / Z在溶液中进行紫外线照射后,异构化(EZI),围绕双键的分子内旋转和围绕单键的苯基旋转成为消散激发态能量的关键非辐射衰变通道。EZI只是现象的结果。在聚集体中,这些分子内运动受到多种分子间相互作用的极大限制,从而导致AIE效应。为了确保高的固态量子产率,防止有害的π-π堆积至关重要。已发现BMO的另一个苯基会增加π-π距离并减弱π-π相互作用。因此,量子产率增加。强的给电子基团和广泛的共轭作用可有效地调节发色发色。根据这些原则,我们成功地将固态量子产率提高了50%,并获得了635 nm的最大红色发射。而且,这些化合物有望用于光开关中,荧光图案及其晶体