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Positron annihilation measurements were performed in aqueous solutions of beta-cyclodextrin, as well as in solid mixtures of this sugar with a long-chained alcohol, n-nonanol. Additionally, acoustic (sound speed, density and compressibility) experiments were done in aqueous beta-cyclodextrin and tert-butanol systems and in a three-component water-beta-cyclodextrin-tert-butanol system. The results show that in aqueous solution cyclodextrin does not form inclusive complexes with alcohol, while solid sugar-alcohol mixtures undergo slow changes in time, most probably caused by exchange of guest between interior and exterior of the host molecule.
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65--68
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Bibliogr. 13 poz., rys.
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- Institute of Experimental Physics, University of Wrocław, 9 M. Borna Sq., 50-204 Wrocław, Poland, glin@wchuwr.pl
Bibliografia
- 1. Balcerzak A, Płowiec R, Kiełczyński P (2002) Absorption of ultrasonic waves in aqueous binary mixtures of α-cyclodextrin and some amphiphilic substances. Molecular and Quantum Acoustics 23:15–25
- 2. Burakowski A, Gliński J (2008) Additivity of adiabatic compressibility with the size and geometry of the solute molecule. J Mol Liq 137:25–30
- 3. Delaurent C, Siguffi AM, Pepe G (1998) Cyclodextrin inclusion complexes with vitamin D3: investigations of the solid complex characterization. Chemia Analityczna 43:601–616
- 4. Ernst S, Gliński J, Jeżowska-Trzebiatowska B (1979) Dependence of the ultrasound velocity on association of liquids. Acta Phys Pol A 55:501–516
- 5. Funasaki N, Yodo H, Hada S, Neya S (1992) Stoichiometries and equilibrium constants of cyclodextrin – surfactant complexations. Bull Chem Soc Japan 65:1323–1330
- 6. Gliński J (2002) Additivity of sound velocity in binary liquid mixtures. J Solution Chem 31:59–70
- 7. Gliński J, Burakowski A (2008) Is the hydration number of a non-electrolyte additive with length and constituents of the solute molecule? Eur Phys J Special Topics 154:275–279
- 8. Hsu FH, Michael JM, Song L, Armstrong DW (1993) Studies of cyclodextrin complexes by positron annihilation. J Physique IV 3:297–303
- 9. Hsu FH, Yang MM, Yang CC (1978) Positron annihilation in alpha- and beta-cyclodextrin. Appl Phys B: Lasers and Optics 15:85–87
- 10. Jerie K, Baranowski A, Rozenfeld B, Ernst S, Gliński J (1983) Positron annihilation in and compressibility of water-organic mixtures. I. The system water-tetrahydrofuran. Acta Phys Pol A 64:77–92
- 11. Jerie K, Baranowski A, Rozenfeld B, Gliński J, Ernst S (1987) Positron annihilation in and compressibility of water-alcohol mixtures. Phys Scr 35:729–734
- 12. Pasynski A (1938) Solvation of non-electrolytes and the compressibility of their solutions. Acta Physicochim USRR 8:385–418
- 13. Sano T, Yamamoto M, Hori H, Yasunaga T (1984) Kinetic studies of the complex formation in the system of cyclodextrin, iodine, and iodide. Bull Chem Soc Japan 57:678–680
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Bibliografia
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bwmeta1.element.baztech-article-BUJ7-0014-0013