Issue 11, 2001
From the journal:

Journal of the Chemical Society, Perkin Transactions 2

NMR Investigation of the complexation of neutral guests by cucurbituril

Mustapha El Haouaj,a   Young Ho Ko,b   Michel Luhmer,c   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, 1050 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 790-784, South Korea

c Département de Chimie-RMN (CP160/08), Université Libre de Bruxelles, 50 Avenue F. D. Roosevelt, 1050 Bruxelles, Belgium

Abstract

The effect of acidity on the stability of the complexes of neutral guests with cucurbituril (CB), a synthetic receptor, in aqueous Na2SO4 solutions is investigated by 129Xe, 19F and 1H NMR spectroscopy. The apparent affinity constants of THF and xenon for CB were measured and found to be independent of the pH of the solution. It was also observed that small acids, such as TFA, in their undissociated form can be encapsulated inside the CB cavity. The apparent association constants of THF, Xe and TFA for CB are estimated to be around 1700 M−1, 210 M−1 and 11 M−1, respectively.

Graphical abstract: NMR Investigation of the complexation of neutral guests by cucurbituril

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Article information

DOI
https://doi.org/10.1039/B105535F
Article type
Paper
Submitted
25 Jun 2001
Accepted
07 Sep 2001
First published
09 Oct 2001

J. Chem. Soc., Perkin Trans. 2, 2001, 2104-2107

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NMR Investigation of the complexation of neutral guests by cucurbituril

M. E. Haouaj, Y. Ho Ko, M. Luhmer, K. Kim and K. Bartik, J. Chem. Soc., Perkin Trans. 2, 2001, 2104 DOI: 10.1039/B105535F

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