Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.13/42999
- Title
- Interaction between cucurbit[8]uril and viologen derivatives
- Author/Creator
-
Xiao, Xin;
Tao, Zhu;
Xue, Sai-Feng;
Zhu, Qian-Jiang;
Zhang, Jian-Xin;
Lawrance, Geoffrey A.;
Raguse, Burkhard;
Wei, Gang
- Institution
- The University of Newcastle. Faculty of Science & Information Technology, School of Environmental and Life Sciences
- Description
- The interaction between cucurbit[8]uril (Q[8]) and a series of symmetric viologen derivatives having aliphatic substituents of variable length [N,N'-dialkyl-4,4'-bipyridinium dianions; alkyl = CH₃(CH₂)n–,n = 0 (MV²⁺), 1 (EV²⁺), 2 (PV²⁺), 3 (BV²⁺), 4 (FV²⁺), 5 (HV²⁺) or 6 (SV²⁺); BPY²⁺ = diprotonated 4,4-bipyridine], determined by ¹H NMR and electronic absorption spectroscopy methods, is described. Some different binding models were observed in this work when compared to the interactions between cucurbit[7]uril (Q[7]) and these guests. The experimental results revealed that the binding site of the guests by Q[8] depended strongly on the length of the aliphatic substituents on the 4,4'-bipyridinium nucleus. While a 1:2 complex was observed for Q[8]-BPY²⁺ under acidic conditions, a 1:1 complex was formed for Q[8]-viologen derivatives with chains shorter than four carbon atoms. However, multiple Q[8] molecules could be threaded on the longer-chain FV²⁺, HV²⁺ or SV²⁺ molecules to form 2:1 and even possibly 3:1 complexes.
- Relation
- Journal of Inclusion Phenomena and Macrocyclic Chemistry Vol. 61, Issue 1-2, p. 131-138
- Publisher Link
- http://dx.doi.org/10.1007/s10847-007-9405-1
- Date
- 2008
- Publisher
- Springer Netherlands
- Keyword(s)
-
cucurbit[8]uril;
viologen derivatives;
binding models;
¹H NMR spectroscopy;
electronic absorption spectroscopy
- Resource Type
- journal article
- Identifier
- http://hdl.handle.net/1959.13/42999
- Identifier
- ISSN:0923-0750
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