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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Zielenkiewicz, W., Kulikov, O.V. & Kulis-Cwikla, I. Excess enthalpies and apparent molar volumes of aqueous solutions of crown ethers and cryptand(222) at 25°C. J Solution Chem 22, 963–973 (1993). https://doi.org/10.1007/BF00647720
- Excess enthalpy
- apparent molar volume
- crown ethers
- cryptand (222)