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The enthalpies of solution of DL-α-alanine in water-organic solvent mixtures at 298.15 K

  • Chemical Thermodynamics and Thermochemistry
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Abstract

The integral enthalpies of solution (298.15 K) of DL-α-alanine in water-organic solvent mixtures were measured at organic component concentrations x 2 = 0–0.4 mole fractions. The organic solvents used were acetonitrile (ACN), formamide (FA), N,N-dimethylformamide (DMFA), and N,N-dimethylsulfoxide (DMSO). The standard enthalpies of solution Δsol H o, solvation Δsolv H o, and transfer (Δtr H o) of DL-α-alanine from water to mixed solvents were calculated. The influence of the structure and properties of solutes and mixture composition on solute thermochemical characteristics was considered. The solution of DL-α-alanine in the mixtures studied was endothermic over the whole range of organic component concentrations. The Δsol H o, Δtr H o, and Δsolv H o values as functions of x 2 can pass extrema (DMSO and DMFA), be almost independent of mixed solvent composition (FA), or be exothermic and monotonic functions (ACN). The enthalpy coefficients of pair interactions (h xy ) between DL-α-alanine and organic solvent molecules were calculated. The linear Kamlet-Taft equation was used to correlate the h xy values with the properties of organic solvents.

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Authors and Affiliations

  1. Institute of the Solution Chemistry, Russian Academy of Sciences, Ivanovo, Russia

    V. I. Smirnov, V. G. Badelin & I. N. Mezhevoi

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  1. V. I. Smirnov
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  2. V. G. Badelin
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  3. I. N. Mezhevoi
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Original Russian Text © V.I. Smirnov, V.G. Badelin, I.N. Mezhevoi, 2006, published in Zhurnal Fizicheskoi Khimii, 2006, Vol. 80, No. 5, pp. 780–786.

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Smirnov, V.I., Badelin, V.G. & Mezhevoi, I.N. The enthalpies of solution of DL-α-alanine in water-organic solvent mixtures at 298.15 K. Russ. J. Phys. Chem. 80, 672–677 (2006). https://doi.org/10.1134/S0036024406050025

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  • DOI: https://doi.org/10.1134/S0036024406050025

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