Energy Transfer in a Mechanically Trapped Exciplex
Energy Transfer in a Mechanically Trapped Exciplex
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DOI：
10.1021/ja901674g
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发表时间：
2009-07-15
影响因子：
15
通讯作者：
Fujita, Makoto
中科院分区：
文献类型：
--
作者：
Klosterman, Jeremy K.;Iwamura, Munetaka;Fujita, Makoto
含有M6L4配位笼的主客体配合物可以表现出不寻常的光反应性，而非常大的荧光团双茂铁的包裹导致了发射的、机械捕获的分子内激基复合体。机械连接的分子内激基复合体对于理解能量转移对供体-受体距离、取向和电子耦合的依赖关系是重要的，但相对来说还没有被探索。稳态和皮秒时间分辨荧光测量表明，被包裹的客体荧光团的选择性激发导致了从被激发客体到发射主客体激基复合态的有效能量转移。
Host-guest complexes involving M6L4 coordination cages can display unusual photoreactivity, and enclathration of the very large fluorophore bisanthracene resulted in an emissive, mechanically trapped intramolecular exciplex. Mechanically linked intramolecular exciplexes are important for understanding the dependence of energy transfer on donor-acceptor distance, orientation, and electronic coupling but are relatively unexplored. Steady-state and picosecond time-resolved fluorescence measurements have revealed that selective excitation of the encapsulated guest fluorophore results in efficient energy transfer from the excited guest to an emissive host-guest exciplex state.