Abstract
Stability constants of the coordination compounds of nickel(II) and cobalt(II) ions with succinic acid anion in water–ethanol solvents are determined via potentiometric titration at ionic strength of 0.1 and at T = 298.15 K. It is found that logβ values of monoligand complexes of these ions and succinic acid anions rise along with the content of ethanol in solution (X EtOH = 0–0.7 mole fractions). Based on an analysis of the thermodynamic characteristics of the solvation of the reagents involved in complex formation, it is found that the increased stability of succinate complexes of nickel(II) and cobalt(II) ions in water–ethanol solvents is mainly determined by the weakening of the solvation of succinic acid anion (Y2−).
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Original Russian Text © N.V. Tukumova, Tran Thi Dieu Thuan, T.R. Usacheva, N.E. Koryshev, V.A. Sharnin, 2017, published in Zhurnal Fizicheskoi Khimii, 2017, Vol. 91, No. 4, pp. 639–643.
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Tukumova, N.V., Dieu Thuan, T.T., Usacheva, T.R. et al. Stability of coordination compounds of Ni2+ and Co2+ ions with succinic acid anion in water–ethanol solvents. Russ. J. Phys. Chem. 91, 662–666 (2017). https://doi.org/10.1134/S003602441704029X
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DOI: https://doi.org/10.1134/S003602441704029X