Tytuł artykułu
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Abstrakty
Interaction between water and ethers in dilute aqueous solutions was investigated by water- heptane partition of twelve linear aliphatic ethers containing various number of carbon atoms (from 2 to 8), and one branched homologue. Standard free energy (Gibbs) and enthalpy of partition were calculated from partition constants and from their temperature dependence. The differences in the free energy and entropy result from different hydrophobic hydration of these amphiphilic solutes in the aqueous phase. The position of the oxygen atom in an ether molecule affects the hydrophilic-hydrophobic properties of the molecule. The methylene groups in the _ and _ positions in respect to the oxygen atom are distinctly less hydrophobic than those more distant, therefore, different are their hydrophobic contributions into standard thermodynamic functions of hydration. The commonly accepted group contribution models, which assume equal contributions from the same fragments irrespectively of their position (additivity principle), should be revised.
Wydawca
Czasopismo
Rocznik
Tom
Strony
111--116
Opis fizyczny
Bibliogr. 17 poz., rys.
Twórcy
autor
- Department of Radiochemistry, Institute of Nuclear Chemistry and Technology, ul. Dorodna 16, 03-195 Warsaw, Poland
autor
- Department of Radiochemistry, Institute of Nuclear Chemistry and Technology, ul. Dorodna 16, 03-195 Warsaw, Poland
Bibliografia
- 1. Paterson W.G. and Cameron D.M., Can. J. Chem., 41, 198 (1963), and the references cited therein.
- 2. Cabani S. and Gianni P., J. Chem. Soc. Farad. I, 75,1184 (1979).
- 3. Davis S.S., Sep. Sci., 10, 1 (1975).
- 4. Cabani S., Gianni P., Molica V. and Lepori L., J. Sol. Chem., 10, 563 (1981).
- 5. Cabani S., Conti G. and Lepori L., Trans. Farad. Soc., 67, 1943 (1971).
- 6. Kehiaian H.V., Tine M.R., Lepori L., Matteoli E. and Marongiu B., Fluid Phase Equilibria, 46, 131 (1989).
- 7. Yalkovky S. andBanerjee S., Aqueous Solubility. Methods of Estimation for Organic Compounds, Marcel Dekker, NY, 1992.
- 8. Leo A.J., Chem. Rev., 93, 1281 (1993).
- 9. Beilstein, E. Ill, p. 367, 1941.
- 10. Shaefer G., J. Org. Chem., 42, 567 (1975).
- 11. Vogel A.I., A Text-book of Practical Organic Chemistry (in Polish), Warszawa, WNT, 1964.
- 12. Gniazdowska E, and Narbutt J., J Mol. Liquids, 84, 273 (2000).
- 13. Gniazdowska E., PhD Thesis, Institute of Nuclear Chemistry and Technology, Warszawa, 2000.
- 14. Nelson H.D. and De Ligny C.L., Rec. Trav. Chim., 87, 623 (1968).
- 15. Deno N.C. and Berkheirner H.E., J. Chem. Engng. Data, 5, 1 (1960).
- 16. Amidon G.L. and Anik S.T., J. Pharmac. Sci., 65, 801 (1976).
- 17. Gniazdowska E., Dobrowolski P. and Narbutt J., in preparation.
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-article-BUJ1-0020-0013