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Dependence of the thermodynamic characteristics of the complexation of alanine-18-crown-6 on the composition of water-ethanol solvent

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Abstract

Standard thermodynamic parameters (Δr G○, Δr H○, TΔr S○) for the complexation reaction of 18-crown-6 ether (18C6) with D,L-alanine (Ala) in mixed water-ethanol (H2O-EtOH) solvents are calculated from the data of calorimetric titrations performed at T = 298.15 K. It is established that an increase in the concentration of EtOH in mixed solvent leads to a rise in stability and an increase in the exothermicity of [Ala18C6] molecular complex formation; changes in the energetics of reaction upon a change in the solvent composition are determined by changes in the solvation state of 18C6, which is typical of the reactions of molecular complex formation of 18C6 with D,L-alanine and glycine in water-organic solvents.

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Authors and Affiliations

  1. Research Institute of Thermodynamics and the Kinetics of Chemical Processes, Ivanovo State University of Chemistry and Technology, Ivanovo, 153460, Russia

    T. R. Usacheva, V. A. Sharnin & I. V. Chernov

Authors
  1. T. R. Usacheva
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  2. V. A. Sharnin
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  3. I. V. Chernov
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Correspondence to T. R. Usacheva.

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Original Russian Text © T.R. Usacheva, V.A. Sharnin, I.V. Chernov, 2013, published in Zhurnal Fizicheskoi Khimii, 2013, Vol. 87, No. 2, pp. 225–227.

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Usacheva, T.R., Sharnin, V.A. & Chernov, I.V. Dependence of the thermodynamic characteristics of the complexation of alanine-18-crown-6 on the composition of water-ethanol solvent. Russ. J. Phys. Chem. 87, 204–207 (2013). https://doi.org/10.1134/S0036024413020313

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  • DOI: https://doi.org/10.1134/S0036024413020313

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