T Kaneko et al 2009 J. Phys.: Conf. Ser. 190 012062 doi:10.1088/1742-6596/190/1/012062
T Kaneko1, M Ueda2, S Nagamatsu2, T Konishi2, T Fujikawa2 and M Mizumaki3
Show affiliationsWe study the structure of inclusion complexes of α-, β-, γ-cyclodextrin with mono-iodide ion in aqueous solution by means of iodine K-edge EXAFS spectroscopy. The analysis is based on the assumption that two kinds of iodide ions exist in KI-cyclodextrin aqueous solution i.e. hydrated mono-iodide ions and one-one mono-iodide-cyclodextrin inclusion complexes. In KI-α-cyclodextrin system, iodine K-edge EXAFS analyse show that the average coordination number of the oxygen atoms in water molecules in the first hydration shell decreases as the fraction of included ions increases. This result suggests that dehydration process accompanies the formation of the inclusion complex. This is not found in the case of β-cyclodextrin, indicating that in this case the iodide ions are included together with the whole first hydration shell.
Soft matter, liquids and polymers
Issue 1 (2009)
T Kaneko et al 2009 J. Phys.: Conf. Ser. 190 012062
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