Email this article Thermodynamics of the complex formation between Cu2+ and triglycine in water–ethanol solutions at 298 K
- Authors: Pham Thi L.1, Usacheva T.R.2, Khrenova T.M.2, Sharnin V.A.2,3
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Affiliations:
- Institute for Tropical Technology
- Ivanovo State University of Chemistry and Technology
- Krestov Institute of Solution Chemistry
- Issue: Vol 91, No 7 (2017)
- Pages: 1235-1240
- Section: Physical Chemistry of Solutions
- URL: https://journals.rcsi.science/0036-0244/article/view/169594
- DOI: https://doi.org/10.1134/S003602441707010X
- ID: 169594
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Abstract
Thermodynamic functions ΔrH, ΔrG, and TΔrS 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.
About the authors
L. Pham Thi
Institute for Tropical Technology
Author for correspondence.
Email: pham_lan@mail.ru
Viet Nam, Hanoi
T. R. Usacheva
Ivanovo State University of Chemistry and Technology
Email: pham_lan@mail.ru
Russian Federation, Ivanovo, 153000
T. M. Khrenova
Ivanovo State University of Chemistry and Technology
Email: pham_lan@mail.ru
Russian Federation, Ivanovo, 153000
V. A. Sharnin
Ivanovo State University of Chemistry and Technology; Krestov Institute of Solution Chemistry
Email: pham_lan@mail.ru
Russian Federation, Ivanovo, 153000; Ivanovo, 153045
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