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Thermodynamics of the complex formation between Cu2+ and triglycine in water–ethanol solutions at 298 K

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Abstract

Thermodynamic functions Δr H, Δr G, and TΔr S of the complex formation between Cu2+ and triglycine in water–ethanol solutions are calculated on the basis of calorimetric data. It is found that raising the concentration of EtOH results in a monotonic increase in the exothermic effect of [CuHL]2+ complex formation due to the weakening of triglycine solvation with the mutual compensation of ion solvation contributions. The enthalpy of [CuL]+ complex formation has an exothermic maximum at 0.1−0.3 molar fractions of EtOH due to competition between the solvation contributions from ions and ligands.

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Authors and Affiliations

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

    L. Pham Thi

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

    T. R. Usacheva, T. M. Khrenova & 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. T. M. Khrenova
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  4. V. A. Sharnin
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Correspondence to L. Pham Thi.

Additional information

Original Russian Text © L. Pham Thi, T.R. Usacheva, T.M. Khrenova, V.A. Sharnin, 2017, published in Zhurnal Fizicheskoi Khimii, 2017, Vol. 91, No. 7, pp. 1161–1166.

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Pham Thi, L., Usacheva, T.R., Khrenova, T.M. et al. Thermodynamics of the complex formation between Cu2+ and triglycine in water–ethanol solutions at 298 K. Russ. J. Phys. Chem. 91, 1235–1240 (2017). https://doi.org/10.1134/S003602441707010X

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  • DOI: https://doi.org/10.1134/S003602441707010X

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