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Thermodynamic characteristics of acid–base equilibria of glycyl-glycyl-glycine in water–ethanol solutions at 298 K

  • Physical Chemistry of Solutions
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Abstract

The enthalpies of the acid dissociation of glycyl-glycyl-glycine zwitterions and triglycinium ions are determined calorimetrically in water–ethanol solvents containing 0.0, 0.10, 0.30, and 0.50 molar fractions of ethanol at ionic strengths of 0.1 (maintained by sodium perchlorate) and Т = 298.15 K. It is found that increasing the ethanol content in the solvent enhances the endothermic effect of triglycinium ion dissociation and reduces the endothermic effect of glycyl-glycyl-glycine dissociation. The results are discussed in terms of the solvation thermodynamics.

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Authors and Affiliations

  1. Institute for Tropical Technology, Vietnam Academy of Science and Technology, Hanoi, Hoang Quoc Viet, Vietnam

    L. Pham Thi

  2. Ivanovo State University of Chemistry and Technology, Ivanovo, 153000, Russia

    T. R. Usacheva & V. A. Sharnin

  3. Krestov Institute of Solution Chemistry, Russian Academy of Sciences, Ivanovo, 153045, Russia

    V. A. Sharnin

Authors
  1. L. Pham Thi
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  2. T. R. Usacheva
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  3. V. A. Sharnin
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Correspondence to L. Pham Thi.

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Original Russian Text © L. Pham Thi, T.R. Usacheva, V.A. Sharnin, 2016, published in Zhurnal Fizicheskoi Khimii, 2016, Vol. 90, No. 12, pp. 1815–1820.

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Pham Thi, L., Usacheva, T.R. & Sharnin, V.A. Thermodynamic characteristics of acid–base equilibria of glycyl-glycyl-glycine in water–ethanol solutions at 298 K. Russ. J. Phys. Chem. 90, 2387–2392 (2016). https://doi.org/10.1134/S0036024416120098

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  • DOI: https://doi.org/10.1134/S0036024416120098

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