NMR Study of the Inclusion Complexes of Carboxy-Phenoxathiin Derivatives with β-Cyclodextrin

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作者
Aura Tintaru
Mihaela Hillebrand
André Thevand
机构
[1] University of Bucharest,Department of Physical Chemistry, Faculty of Chemistry
[2] University of Provence,Laboratory of Physics of Ionic and Molecular Interactions – Spectroscopy and Molecular Dynamics, CNRS 6633
[3] Campus of Saint-Jérôme,undefined
[4] Case 252,undefined
关键词
inclusion complexes; NMR; ROESY; β-cyclodextrin; phenoxathiin derivatives;
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摘要
The inclusion complexes of the carboxylate forms of 3-carboxy-(I) and 2-carboxy-phenoxathiin (II) with β-cyclodextrin were studied by bothone- and two-dimensional NMR spectroscopy. The analysis of the induced chemical shifts of theguests in the presence of different amounts of the host indicates the formation of complexes with 1:1stoichiometry and association averaged pK values of 3.75 (I) and 4.4 (II). Thequalitative analysis of cross peaks in the ROESY spectra support the inclusion of the guests in the cavitywith the substituted phenyl ring, the COO- group being in the proximity of the primary rim.
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页码:35 / 40
页数:5
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