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 

作者机构：Key Laboratory of Mocrocyclic and Supromolecular Chemistry of Guizhou Province Guizhou University Guiyang 550025 China Key Laboratory of Guizhou High Performance Computational Chemistry Guizhou University Guiyang 550025 China Key Laboratory of Chemistry for Natural Products of Guizhou Province Guiyang 550002 China 

出 版 物：《Chinese Chemical Letters》 (中国化学快报（英文版）)

年 卷 期：2018年第29卷第1期

页      面：95-98页

核心收录：

学科分类：07[理学] 0703[理学-化学] 

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) 

主　　题：Cucurbit[7lurilPseudorotaxaneHost guest interactionFluorescence signalBispyridinium ethylene 

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-