题名：Multistate Circularly Polarized Luminescence Switching through Stimuli-Induced Co-Conformation Regulations of Pyrene-Functionalized Topologically Chiral [2]Catenane

来源：Angewandte Chemie - International Edition

发表年代：2022年

作者：Yu Wang, Jiacheng Gong, Xianwei Wang, Wei-Jian Li, Xu-Qing Wang, Xiao He,*  Wei Wang,* Hai-Bo Yang*

Abstract : Aiming at the construction of novel circularlypolarized luminescence (CPL) switches with multipleswitchable emission states and high dissymmetry factors(glum), topologically chiral [2]catenanes were employedas the key platform to construct a novel multistate CPLswitching system. Taking advantage of the precise co-conformation regulations of the resultant pyrene-func-tionalized [2]catenanes under different external stimuli,reversible transformations between three emission stateswith different CPL performances, i.e. the initial “closed”form with a j glum j value of 0.012, the “open” form withan almost complete turn-off of CPL emission, and the“protonated” form with a boosted j glum j value of 0.022, were successfully realized. This study demonstrates thesuccessful construction of not only the first topologicalchirality-based CPL switch, but also a novel bidirec-tional CPL switch, thus providing a promising platformfor the construction of novel chiral materials