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Issue 11, 2001
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NMR Investigation of the complexation of neutral guests by cucurbituril

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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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Publication details

The article was received on 25 Jun 2001, accepted on 07 Sep 2001 and first published on 09 Oct 2001


Article type: Paper
DOI: 10.1039/B105535F
Citation: J. Chem. Soc., Perkin Trans. 2, 2001,0, 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, 0, 2104
    DOI: 10.1039/B105535F

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