Cucurbit[8]uril-regulated face-to-face dimerization assembly enhanced photosensitization and photocatalysis  

作　　者：Haigen Nie Die Hu Zhiyao Zeng Yan Fan Yaxin Zhai Xin-Long Ni 

机构地区：[1]Key Laboratory of Chemical Biology and Traditional Chinese Medicine,Ministry of Educational of China,Key Laboratory of the Assembly and Application of Organic Functional Molecules of Hunan Province,College of Chemistry and Chemical Engineering,Hunan Normal University,Changsha 410081,China [2]Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education,Department of Physics,Hunan Normal University,Changsha 410081,China

出　　处：《Science China Chemistry》2024年第5期1605-1612,共8页中国科学（化学英文版）

基　　金：supported by the National Natural Science Foundation of China (22271090, 12204167)。

摘　　要：In water, N,N′-diarylpyridinium thiazolo[5,4-d]thiazole guests(G1–G3) were encapsulated by cucurbit[8]uril(Q[8]) to construct Q[8]_(3)/G_(2) complexes, in which the encapsulated G molecules exist as an exact face-to-face dimer. These complexation behaviors have been indicated by proton nuclear magnetic resonance(~1H NMR) spectroscopy and isothermal titration calorimetry(ITC),and have been confirmed by X-ray single crystal structural analysis of Q[8]_(3)/G2_(2). While free guests G1–G3 have no ability to sensitize singlet oxygen, they all become effective singlet oxygen sensitizers when complexed with Q[8]. By irradiation of white light, Q[8]_(3)/G_(2) complexes induced selective oxidation of aryl sulfide to aryl sulfoxide in good yields and selective oxidation of dimethyl sulfide(DMS) to dimethyl sulfoxide(DMSO) in excellent yields without over-oxidation to dimethyl sulfone(DMSO_(2))even for elongated irradiation. High-yield photo-oxidation of DMS to DMSO_(2) was only achieved by irradiation of blue light in the presence of Q[8]_(3)/G1_(2), which was also effective in photobleaching of Rhodamine B in water. The higher photo-oxidation power of Q[8]_(3)/G1_(2) has been ascribed to an additional generation of reactive oxygen species besides singlet oxygen.

关 键 词：host-guest interaction DIMERIZATION macrocycles PHOTOSENSITIZATION 

分 类 号：O641.3[理学—物理化学] O643.36[理学—化学] O644.1