Science and Math Cluster, Singapore University of Technology and Design, 8 Somapah Road, Singapore, 487372, Singapore.
CAS Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian, 116023, China.
Angew Chem Int Ed Engl. 2019 May 20;58(21):7073-7077. doi: 10.1002/anie.201902766. Epub 2019 Apr 12.
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.
电荷转移和分离是控制许多化学反应的重要过程。深入了解这些过程和潜在机制对于光化学至关重要。在此，我们报告了一种新的电荷转移和分离过程，即扭曲的分子内电荷穿梭（TICS）的发现。在 TICS 体系中，由于分子内约 90°的旋转，供体和受体部分在激发态中动态地切换角色。因此，TICS 体系表现出电荷穿梭。TICS 存在于几种荧光团的化学家族中（如香豆素、BODIPY 和氧/碳/硅罗丹明），可用于构建功能性荧光探针（即粘度或生物分子传感探针）。TICS 过程的发现扩展了当前对电荷转移过程的认识，并将激发未来的应用。
