Excess enthalpies and apparent molar volumes of aqueous solutions of crown ethers and cryptand(222) at 25°C |
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Authors: | Wojciech Zielenkiewicz Oleg V Kulikov Iwona Kulis-Cwikla |
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Institution: | (1) Institute of Physical Chemistry, Polish Academy of Sciences, 01-224 Warsaw, Poland;(2) Institute of Non-Aqueous Solution Chemistry, Russian Academy of Sciences, 153045 Ivanovo, Russia |
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Abstract: | The enthalpies of dilution and densities of aqueous solutions of 12-crown-4, 15-crown-5, 18-crown-6, 1,10-diaza-18-crown-6 and cryptand (222) were measured at 25°C. The excess enthalpies and enthalpic coefficients of solute-solute interactions were calculated by the McMillan-Mayer theory formalism. Values for the apparent molar volumes at infinite dilution were determined by extrapolation. The contributions of the-CH2CH2O-group to values of h2 and to the limiting partial molar volume were calculated for the series of crown ethers studied. It is concluded that the hydrophobic hydration and the hydrophobic solute-solute interaction are predominant in the solutions investigated. |
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Keywords: | Excess enthalpy apparent molar volume crown ethers cryptand (222) |
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