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

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• 作者：Evgeniy V. Ivanov^a ; ^{evi@isc-ras.ru"" rel=""nofollow} ; ^{evi_ihrras@mail.ru"" rel=""nofollow} ; Dmitriy V. Batov^b
• 关键词：Enthalpies of dilution ; Enthalpy-related interaction parameters ; 1 ; 1 ; 3 ; 3-Tetramethylurea ; 1 ; 3-Dimethylethyleneurea ; 1 ; 3-Dimethylpropyleneurea ; 2 ; 4 ; 6 ; 8-Tetramethyl-bis-urea ; Ordinary and heavy water
• 刊名：Thermochimica Acta
• 出版年：2011
• 出版时间：20 August 2011
• 年：2011
• 卷：523
• 期：1-2
• 页码：253-257
• 全文大小：294 K

文摘

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 (TMbU) in ordinary (H₂O) and heavy (D₂O) water were measured calorimetrically at 298.15 K. The enthalpy coefficients for pair (h₂₂) and triplet (h₂₂₂) interactions between hydrated solute molecules were estimated using the McMillan–Mayer formalism. The quantities of h₂₂ as well as the corresponding solvent isotope effects were found to be positive for aqueous TMU, DMPU and DMEU and negative for aqueous TMbU. The correlation between h₂₂ and standard enthalpies of solution of these compounds in H₂O and D₂O was established at the temperature in question.