Lighting Up Bispyrene-Functionalized Chiral Molecular Muscles with Switchable Circularly Polarized Excimer Emissions

作     者：Xue Li Dr. Wei-Tao Xu Xiao-Qin Xu Dr. Yu Wang Dr. Xu-Qing Wang Prof. Dr. Hai-Bo Yang Prof. Dr. Wei Wang 

作者机构：Shanghai Key Laboratory of Green Chemistry and Chemical Processes School of Chemistry and Molecular Engineering East China Normal University 3663 N. Zhongshan Road Shanghai 200062 China State Key Laboratory of Petroleum Molecular and Process Engineering Sinopec Research Institute of Petroleum Processing Co. LTD. Beijing 100083 China East China Normal University Shanghai 200062 China Shanghai Center of Brain-inspired Intelligent Materials and Devices East China Normal University Shanghai 200241 China 

出 版 物：《Angewandte Chemie》 

年 卷 期：2024年第137卷第1期

学科分类：081704[工学-应用化学] 08[工学] 0817[工学-化学工程与技术] 

主　　题：molecular machine molecular daisy chain pillar[5]arene pyrene excimer stimuli responsiveness 

摘      要：Aiming at the further extension of the application scope of traditional molecular muscles, a novel bispyrene-functionalized chiral molecular [c2]daisy chain was designed and synthesized. Taking advantage of the unique dimeric interlocked structure of molecular [c2]daisy chain, the resultant chiral molecular muscle emits strong circularly polarized luminescence (CPL) attributed to the pyrene excimer with a high dissymmetry factor ( g lum ) value of 0.010. More importantly, along with the solvent- or anion- induced motions of the chiral molecular muscle, the precise regulation of the pyrene stacking within its skeleton results in the switching towards either “inversed state with sign inversion and larger g lum values or “down state with maintained handedness and smaller g lum values, making it a novel multistate CPL switch. As the first example of chiral molecular muscle-based CPL switch, this proof-of-concept study not only successfully widens the application scopes of molecular muscles, but also provides a promising platform for the construction of novel smart chiral luminescent materials for practical applications.