pH-Switched fluorescent pseudorotaxane assembly of cucurbit[7]uril with bispyridinium ethylene derivatives  

作　　者：Wei Wu Sen Song Xiaowei Cui Tao sun Jian-xin Zhang Xin-Long Ni 

机构地区：[1]Key Laboratory of Mocrocyclic and Supromolecular Chemistry of Guizhou Province, Guizhou University, Guiyang 550025, China [2]Key Laboratory of Guizhou High Performance Computational Chemistry, Guizhou University, Guiyang 550025, China [3]Key Laboratory of Chemistry for Natural Products of Guizhou Province, Guiyang 550002, China

出　　处：《Chinese Chemical Letters》2018年第1期95-98,共4页中国化学快报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.21302026,21361006);“Chun-Hui” Fund of Chinese Ministry of Education(Nos. Z2016011, Z2015002);Guizhou Province(Nos. 20165656, 20132150)

摘　　要：The host-guest properties of cucurbit[7]uril （0_[7]） and bispyridinium ethylene derivatives have been studied by 1H NMR spectroscopy, UV-vis absorption spectra, and fluorescence emission analysis. The proton shifts associated with the guest encapsulated by the host suggested that the Q[7]-based [2] pseudorotaxane behaves like a fast molecular shuttle along the bispyridinium ethylene axle of the guest upon protonation and deprotonation of the terminal carboxylates. In particular, the distinct fluorescent response signals indicated that the bispyridinium component for the pseudorotaxane system, but also ~uest comDlexation. ethylene moiety not only behaves as the axle acts as an optical reporting unit during the host-The host-guest properties of cucurbit[7]uril （0_[7]） and bispyridinium ethylene derivatives have been studied by 1H NMR spectroscopy, UV-vis absorption spectra, and fluorescence emission analysis. The proton shifts associated with the guest encapsulated by the host suggested that the Q[7]-based [2] pseudorotaxane behaves like a fast molecular shuttle along the bispyridinium ethylene axle of the guest upon protonation and deprotonation of the terminal carboxylates. In particular, the distinct fluorescent response signals indicated that the bispyridinium component for the pseudorotaxane system, but also ~uest comDlexation. ethylene moiety not only behaves as the axle acts as an optical reporting unit during the host-

关 键 词：Cucurbit[7lurilPseudorotaxaneHost-guest interactionFluorescence signalBispyridinium ethylene 

分 类 号：O6[理学—化学]