Citation: Wu Wei, Song Sen, Cui Xiaowei, Sun Tao, Zhang Jian-Xin, Ni Xin-Long. pH-Switched fluorescent pseudorotaxane assembly of cucurbit[7]uril with bispyridinium ethylene derivatives[J]. Chinese Chemical Letters, ;2018, 29(1): 95-98. doi: 10.1016/j.cclet.2017.08.049 shu

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

Wu Wei ^a ,
Song Sen ^a ,
Cui Xiaowei ^a ,
Sun Tao ^b ,
Zhang Jian-Xin ^c ,
Ni Xin-Long ^a,,

a.
Key Laboratory of Macrocyclic and Supramolecular Chemistry of Guizhou Province, Guizhou University, Guiyang 550025, China
b.
Key Laboratory of Guizhou High Performance Computational Chemistry, Guizhou University, Guiyang 550025, China
c.
Key Laboratory of Chemistry for Natural Products of Guizhou Province, Guiyang 550002, China

Corresponding author: Ni Xin-Long, longni333@163.com
Received Date: 27 May 2017
Revised Date: 27 July 2017
Accepted Date: 24 August 2017
Available Online: 30 January 2017

Figures(6)

The host-guest properties of cucurbit[7]uril (Q[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 ethylene moiety not only behaves as the axle component for the pseudorotaxane system, but also acts as an optical reporting unit during the host-guest complexation.
- Cucurbit[7]uril,
- Pseudorotaxane,
- Host-guest interaction,
- Fluorescence signal,
- Bispyridinium ethylene
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