Brightening up Circularly Polarized Luminescence of Monosubstituted Polyacetylene by Conformation Control: Mechanism, Switching, and Sensing. Issue 40 (31st August 2021)

• Record Type: Journal Article
• Authors: Wang, Sheng; Hu, Deping; Guan, Xiaoyan; Cai, Siliang; Shi, Ge; Shuai, Zhigang; Zhang, Jie; Peng, Qian; Wan, Xinhua
• Is Part Of: Angewandte Chemie international edition. Volume 60:Issue 40(2021)
• Page Start: 21918
• Page End: 21926
• Publication Date: 2021-08-31
• Subjects: circularly polarized luminescence -- conformational transition -- CPL sensor -- polyacetylene -- stimuli-responsiveness; Chemistry -- Periodicals; 540
• DOI: 10.1002/anie.202108010
• Languages: English
• ISSNs: 1433-7851

Abstract

Abstract: The first example of luminescent monosubstituted polyacetylenes (mono‐PAs) is presented, based on a contracted cis‐cisoid polyene backbone. It has an excellent circularly polarized luminescence (CPL) performance with a high dissymmetric factor (up to the order of 10 −1 ). The luminescence stems from the helical cis‐cisoid PA backbone, which is tightly fixed by the strong intramolecular hydrogen bonds, thereby reversing the energy order of excited states and enabling an emissive energy dissipation. CPL switches are facilely achieved by the solvent and temperature through reversible conformational transition. By taking advantages of fast response and high sensitivity, the thin film of mono‐PAs could be used as a CPL‐based probe for quantitative detection of trifluoroacetic acid with a wider linear dynamic range than those of photoluminescence and circular dichroism. This work opens a new avenue to develop novel smart CPL materials through modulating conformational transition. Abstract : A strategy is described that enables the conventionally non‐luminescent monosubstituted polyacetylenes bearing no pendant fluorophore to light up and show a switchable circularly polarized luminescence (CPL) with a large dissymmetric factor ( g lum, 10 −1 ), multiple reversible stimuli‐responsiveness, and quantitative detection by conformational transition of polyene backbone.