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Effect of physicochemical properties of water-propane-2-ol mixture and temperature on thermodynamics of Cu complexation with glycine

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Abstract

The stability constants of Cu2+ complexes with glycine are determined by potentiometric method in water-propane-2-ol mixture, i.e., [CuL]+, CuL2 (L = Gly−) (0.070, 0.167, 0.310 mole fraction of alcohol), and [CuHL]2+ (0.070 mole fraction of alcohol) at 298.15, 308.15, and 318.15 K. Thermodynamic characteristics of Cu2+ complexation with glycine and the Gibbs energy of transfer of complex species [CuL]+ and CuL2 from water to a mixed solvent are calculated. The solvation-thermodynamic analysis of effects of water-propane-2-ol solvents and of separate solvation contributions of reagents to Cu2+ coordination with glycine is performed. The increasing stability of the [CuL]+ and CuL2 complexes in water-propane-2-ol as compared to that in pure water is explained by the increasing energy of solvation of complex species [CuL]+ and CuL2 and by the decreasing energy of solvation of Cu2+ and Gly− ions.

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Authors and Affiliations

  1. Karasin Kharkov National University, Kharkov, Ukraine

    E. N. Tsurko, N. V. Bondarev, T. M. Shikhova & E. V. Khrebto

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  1. E. N. Tsurko
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  2. N. V. Bondarev
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  3. T. M. Shikhova
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  4. E. V. Khrebto
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__________

Translated from Koordinatsionnaya Khimiya, Vol. 31, No. 4, 2005, pp. 311–318.

Original Russian Text Copyright © 2005 by Tsurko, Bondarev, Shikhova, Khrebto.

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Tsurko, E.N., Bondarev, N.V., Shikhova, T.M. et al. Effect of physicochemical properties of water-propane-2-ol mixture and temperature on thermodynamics of Cu complexation with glycine. Russ J Coord Chem 31, 291–297 (2005). https://doi.org/10.1007/s11173-005-0091-5

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  • DOI: https://doi.org/10.1007/s11173-005-0091-5

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