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Enthalpy-related interaction parameters in H/D isotopically distinguishable aqueous solutions of tetramethylurea cyclic derivatives at 298.15 K

Ivanov, Evgeniy V. ; Batov, Dmitriy V.

Thermochimica acta, 2011-08, Vol.523 (1), p.253-257 [Periódico revisado por pares]

Oxford: Elsevier B.V

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  • Título:
    Enthalpy-related interaction parameters in H/D isotopically distinguishable aqueous solutions of tetramethylurea cyclic derivatives at 298.15 K
  • Autor: Ivanov, Evgeniy V. ; Batov, Dmitriy V.
  • Assuntos: 1,1,3,3-Tetramethylurea ; 1,3-Dimethylethyleneurea ; 1,3-Dimethylpropyleneurea ; 2,4,6,8-Tetramethyl- bis-urea ; Enthalpies of dilution ; Enthalpy-related interaction parameters ; Ordinary and heavy water
  • É parte de: Thermochimica acta, 2011-08, Vol.523 (1), p.253-257
  • Descrição: [Display omitted] ► Enthalpy-related coefficients for pair ( h 22) and triplet ( h 222) solute − solute interactions in H/D isotopically distinguishable aqueous solutions of 1,3-dimethylethyleneurea (DMEU), 1,3-dimethylpropyleneurea (DMPU), 1,1,3,3-tetramethylurea (TMU) and 2,4,6,8-tetramethyl- bis-urea (TM bU) were estimated using the dilution enthalpies and McMillan–Mayer formalism. ► The quantities of h 22 as well as corresponding D 2O–H 2O solvent isotope effects were found to be positive for aqueous TMU, DMPU and DMEU and negative for aqueous TM bU. ► The close-to-linear correlation between h 22 and standard enthalpies of solution for TMU and its cyclic derivatives in both H 2O and D 2O was established. The enthalpies for dilution of solutions of 1,1,3,3-tetramethylurea (TMU), 1,3-dimethylethyleneurea (DMEU), 1,3-dimethylpropyleneurea (DMPU) and 2,4,6,8-tetramethyl- bis-urea (TM bU) in ordinary (H 2O) and heavy (D 2O) water were measured calorimetrically at 298.15 K. The enthalpy coefficients for pair ( h 22) and triplet ( h 222) interactions between hydrated solute molecules were estimated using the McMillan–Mayer formalism. The quantities of h 22 as well as the corresponding solvent isotope effects were found to be positive for aqueous TMU, DMPU and DMEU and negative for aqueous TM bU. The correlation between h 22 and standard enthalpies of solution of these compounds in H 2O and D 2O was established at the temperature in question.
  • Editor: Oxford: Elsevier B.V
  • Idioma: Inglês;Russo
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