Temperature effects on CD spectra of .BETA.-cyclodextrin complexes with 2-substituted naphthalenes.

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概要

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• CD spectra of β-cyclodextrin complexes with 2-naphthol, 2-naphthyloxyacetic acid, potassium 2-naphthoate, and potassium 2-naphthylacetate were measured at various concentrations of β-cyclodextrin and at temperatures ranging from 10 to 70°C. The temperature-dependent CD spectra of the 2-naphthyloxyacetic acid complex clearly show the 1 : 1 complex formation, but the other three complexes give CD intensity changes which are inexplicable in terms of the 1 : 1 stoichiometry. The molecular ellipticity and thermodynamic parameters were determined by the least-squares method. Enthalpy and entropy are in the ranges from −22.2 to −26.8 kJ·mol<SUP>−1</SUP> and from −24 to −38 J·K<SUP>−1</SUP>·mol<SUP>−1</SUP>, respectively. They are strongly correlated to the volume of the substituent of the guest molecule, although the free energy is found in a quite narrow region (from −14.3 to −15.4 kJ·mol<SUP>−1</SUP>). The correlation is explained on the basis of the β-cyclodextrin-guest interaction and the solvation around the guest molecule.

• 公益社団法人 日本化学会の論文

著者

• HARATA KAZUAKI

  Research Institute for Polymer and Textiles

• Harata Kazuaki

  Research Institute for Polymers and Textiles

関連論文

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• The structure of the cyclodextrin complex. XVIII. Crystal structure of .BETA.-cyclodextrin-benzyl alcohol (1:1) complex pentahydrate.
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• The structure of the cyclodextrin complex. XIX Crystal structures of hexakis(2,3,6-tri-O-methyl)-.ALPHA.-cyclodextrin complexes with (S)- and (R)-mandelic acid. Chiral recognition through the induced-fit conformational change of the macrocyclic ring.
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