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D2O — H2O Solvent Isotope Effects on the Apparent Molar Volumes of Tetramethyl-bis-urea (Mebicarum) Solutions

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Abstract

Densities of solutions of tetramethyl-bis-urea (TMbU) or “Mebicarum” in H2O and D2O, with solute mole fraction concentrations (x 2) ranging up to 3.2 × 10−3, have been measured at 288.15, 298.15, 308.15 and 318.15 K using a precision vibrating-tube densimeter. The limiting apparent molar volumes, V φ,2 ∞, and expansibilities, E p, φ, 2 ∞, of the solute have been calculated. The isotope effect δ V φ,2 ∞(H2O → D2O;T) is negative, monotonously decreases in magnitude with temperature and reverses sign at T ≈ 318 K. Water (H2O, D2O) and TMbU molecules in infinitely- and highly-dilute aqueous solutions form H(D)-bonded hydration complexes with a high packing density. The hydration of TMbU should be treated as a superposition of two mechanisms, hydrophobic and hydrophilic, with the latter one predominating.

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Authors and Affiliations

  1. Institute of Solution Chemistry of the Russian Academy of Sciences, 1 Akademicheskaya Street, 153045, Ivanovo, Russian Federation

    Evgeniy V. Ivanov & Vladimir K. Abrosimov

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  1. Evgeniy V. Ivanov
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  2. Vladimir K. Abrosimov
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Correspondence to Evgeniy V. Ivanov.

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Ivanov, E.V., Abrosimov, V.K. D2O — H2O Solvent Isotope Effects on the Apparent Molar Volumes of Tetramethyl-bis-urea (Mebicarum) Solutions. J Solution Chem 36, 313–325 (2007). https://doi.org/10.1007/s10953-006-9118-x

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