A Photoexcitation‐Induced Twisted Intramolecular Charge Shuttle. Issue 21 (12th April 2019)

• Record Type: Journal Article
• Authors: Chi, Weijie; Qiao, Qinglong; Lee, Richmond; Liu, Wenjuan; Teo, Yock Siong; Gu, Danning; Lang, Matthew John; Chang, Young‐Tae; Xu, Zhaochao; Liu, Xiaogang
• Is Part Of: Angewandte Chemie international edition. Volume 58:Issue 21(2019)
• Page Start: 7073
• Page End: 7077
• Publication Date: 2019-04-12
• Subjects: charge transfer and separation -- fluorescent probes -- fluorophore -- biosensors -- donor–acceptor systems; Chemistry -- Periodicals; 540
• DOI: 10.1002/anie.201902766
• Languages: English
• ISSNs: 1433-7851

Abstract

Abstract: Charge transfer and separation are important processes governing numerous chemical reactions. Fundamental understanding of these processes and the underlying mechanisms is critical for photochemistry. Herein, we report the discovery of a new charge‐transfer and separation process, namely the twisted intramolecular charge shuttle (TICS). In TICS systems, the donor and acceptor moieties dynamically switch roles in the excited state because of an approximately 90° intramolecular rotation. TICS systems thus exhibit charge shuttling. TICSs exist in several chemical families of fluorophores (such as coumarin, BODIPY, and oxygen/carbon/silicon–rhodamine), and could be utilized to construct functional fluorescent probes (i.e., viscosity‐ or biomolecule‐sensing probes). The discovery of the TICS process expands the current perspectives of charge‐transfer processes and will inspire future applications. Abstract : Twisted intramolecular charge shuttle (TICS) : In TICS systems, the donor and acceptor moieties dynamically switch roles in the excited state due to an approximately 90° intramolecular rotation that is induced upon photoexcitation. This results in charge shuttling. TICSs exist in several families of fluorophores and could be utilized in the construction of fluorescent probes.