Issue 5, 2001
From the journal:

Journal of the Chemical Society, Perkin Transactions 2

NMR study of the reversible complexation of xenon by cucurbituril

Mustapha El Haouaj,a   Michel Luhmer,a   Young Ho Ko,b   Kimoon Kimb  and  Kristin Bartik*a  

* Corresponding authors

a Laboratoire de Chimie Organique E.P. (CP165/64), Université Libre de Bruxelles, 50 Avenue F. D. Roosevelt, Bruxelles, Belgium
E-mail: kbartik@ulb.ac.be

b National Creative Research Initiative Center for Smart Supramolecules and Department of Chemistry, Division of Molecular and Life Sciences, Pohang University of Science and Technology, San 31 Hyojadong, Pohang, South Korea

Abstract

The interaction of xenon with cucurbituril, a synthetic receptor, in aqueous solutions is investigated by 129Xe and 1H NMR spectroscopy. Xenon is reversibly trapped into the cavity to form a 1 ∶ 1 host–guest complex. The exchange between the free and the complexed xenon is slow on the 129Xe NMR chemical shift time scale but fast on the 1H NMR chemical shift time scale. The apparent association constant of xenon for cucurbituril can be obtained from analysis of the 1H spectra and is estimated to be around 200 M−1 at 298 K. Interestingly, even though no H-bonding or electrostatic interactions play a role in the stabilisation of the complex, its stability is comparable to the stability of cucurbituril complexes with certain aryl- and alkyl-ammonium ions.

Graphical abstract: NMR study of the reversible complexation of xenon by cucurbituril

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Article information

DOI
https://doi.org/10.1039/B008623L
Article type
Paper
Submitted
25 Oct 2000
Accepted
14 Mar 2001
First published
10 Apr 2001

J. Chem. Soc., Perkin Trans. 2, 2001, 804-807

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NMR study of the reversible complexation of xenon by cucurbituril

M. El Haouaj, M. Luhmer, Y. H. Ko, K. Kim and K. Bartik, J. Chem. Soc., Perkin Trans. 2, 2001, 804 DOI: 10.1039/B008623L

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