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Article Dans Une Revue Australian Journal of Chemistry Année : 2019

Using Thermodynamics to Assess the Molecular Interactions of Tetrabutylphosphonium Carboxylate–Water Mixtures

Résumé

Densities, ρ, viscosities, η, and enthalpies of mixing of binary [P4 4 4 4][CnCOO]–water mixtures (with n = 1, 2 or 7) were determined at atmospheric pressure as a function of temperature. The excess, apparent, and partial molar volumes were deduced from experimental data, as well as fragilities, m*, and excess Gibbs free energies of activation of viscous flow exhibited predominantly negative deviation from ideality, with a minimum at approximately xw ~0.8 for all three systems, indicating strong hydrogen-bonding interactions. All three binary systems were found to be fragile, with [P4 4 4 4][C7COO] showing the smallest deviations in fragility with the addition of water. Mixing enthalpy values of the systems were exothermic over the entire composition range, having the following trend: [P4 4 4 4][C2COO] > [P4 4 4 4][C7COO] > [P4 4 4 4][C1COO].
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Dates et versions

hal-02055433 , version 1 (04-03-2019)

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Darius Yeadon, Johan Jacquemin, Natalia Plechkova, Margarida Costa Gomes, Kenneth R. Seddon. Using Thermodynamics to Assess the Molecular Interactions of Tetrabutylphosphonium Carboxylate–Water Mixtures. Australian Journal of Chemistry, 2019, 72 (2), pp.144. ⟨10.1071/CH18481⟩. ⟨hal-02055433⟩
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