Cucurbit[7]uril-Encapsulation-Controlled Supramolecular Photoproduct and Radical Fluorescence Emission |
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| Authors: | Min Peng Yi Luo Dr Yutao Rao Prof Dr Jianxin Song Dr Xin-Long Ni |
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| Institution: | Key Laboratory of Chemical Biology and Traditional Chinese Medicine, Key Laboratory of the Assembly and Application of Organic Functional Molecules of Hunan Province, Hunan Normal University, Changsha, Hunan, 410081 P. R. China |
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| Abstract: | Herein, a host–guest interaction–controlled photoproduct created by using cucurbit7]uril (Q7])-based pseudorotaxane structures is reported. The assembly exhibited controlled behavior towards the reduction of the ethylene (C=C) bond in the tetrakis(pyridin-4-yl)ethylene (TPyE) guest molecule under UV light irradiation. This can be attributed to the Q7] encapsulation masking the four pyridinium arms of the guest, which inhibits planarization of the TPyE core to form the cyclization product. In particular, the strong affinity of Q7] for the butyl-substituted guest (TPyE-4C) led to an unusual radical fluorescence emission of the photoirradiation-triggered intermediate of the guest molecule being observed in aqueous solution. This work provides a valuable paradigm and new insight for macrocycle-based host−guest interactions in supramolecular catalysis and luminescent radical materials. |
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| Keywords: | macrocycles host–guest complexes photocatalysis radical fluorescence |
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