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

  • Physical Chemistry of Solutions
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Abstract

The integral enthalpies of solution (T = 298.15 K) of L-α-alanyl-L-α-alanine in aqueous-organic solvents (acetonitrile, 1,4-dioxane, acetone, formamide, N-methylformamide, N,N-dimethylformamide, N,N-diethylformamide, and N,N-dimethylsulfoxide) were measured at organic component concentrations x 2 = 0–0.3 mole fractions. The standard enthalpies of solution (Δsol H o) and transfer (Δtr H o) of the peptide from water into mixed solvents were calculated. The influence of the structure and properties of solutes and mixture composition on solute thermochemical characteristics is considered. The enthalpy pair interaction coefficients h xy between L-α-alanyl-L-α-alanine and organic solvent molecules were calculated. The linear Kamlet-Taft four-parameter equation was used to reveal correlation between the h xy values and the properties of organic solvents.

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

    V. I. Smirnov & V. G. Badelin

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  1. V. I. Smirnov
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  2. V. G. Badelin
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Correspondence to V. I. Smirnov.

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Original Russian Text © V.I. Smirnov, V.G. Badelin, 2008, published in Zhurnal Fizicheskoi Khimii, 2008, Vol. 82, No. 9, pp. 1744–1748.

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Smirnov, V.I., Badelin, V.G. The enthalpies of solution of L-α-alanyl-L-α-alanine in water-organic solvent mixtures at 298.15 K. Russ. J. Phys. Chem. 82, 1555–1559 (2008). https://doi.org/10.1134/S0036024408090276

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  • DOI: https://doi.org/10.1134/S0036024408090276

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