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Influence of the composition of aqueous dimethylsulfoxide solvent on thermodynamics of complexing between 18-crown-6-ether and D,L-alanine

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Abstract

Standard thermodynamic parameters (logK o, Δr H o, TΔr S o) of complexing 18-crown-6 ether (18C6) with D,L-alanine (Ala) in mixed water-dimethysulfoxide (H2O-DMSO) solvents are calculated on the basis of calorimetric titration results. A rise in the DMSO concentration in mixed solvent is found to increase stability and increase the exothermicity of the formation of [Ala-18C6] molecular complex. Changes in the reaction energetic are shown to be determined by changes in the solvation state of 18C6 that is the characteristic of the reactions of molecular complex formation between 18C6 and D,L-alanine or glycine in water-organic solvents.

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Authors and Affiliations

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

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

  2. Institute of Physical and Chemical Processes, National Research Council of Italy, Pisa, 56124, Italy

    E. Matteoli

Authors
  1. T. R. Usacheva
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  2. I. A. Kuzmina
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  3. V. A. Sharnin
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  4. I. V. Chernov
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  5. E. Matteoli
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Correspondence to T. R. Usacheva.

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Original Russian Text © T.R. Usacheva, I.A. Kuzmina, V.A. Sharnin, I.V. Chernov, E. Matteoli, 2012, published in Zhurnal Fizicheskoi Khimii, 2012, Vol. 86, No. 7, pp. 1179–1182.

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Usacheva, T.R., Kuzmina, I.A., Sharnin, V.A. et al. Influence of the composition of aqueous dimethylsulfoxide solvent on thermodynamics of complexing between 18-crown-6-ether and D,L-alanine. Russ. J. Phys. Chem. 86, 1064–1067 (2012). https://doi.org/10.1134/S003602441207031X

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  • DOI: https://doi.org/10.1134/S003602441207031X

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