Stability of coordination compounds of Ni2+ and Co2+ ions with succinic acid anion in water–ethanol solvents

被引：0
作者：
N. V. Tukumova
Tran Thi Dieu Thuan
T. R. Usacheva
N. E. Koryshev
V. A. Sharnin
机构：
[1] Ivanovo State University of Chemistry and Technology,Institute of Research & Development
[2] Duy Tan University,Krestov Institute of Solution Chemistry
[3] Russian Academy of Sciences,undefined
来源：
Russian Journal of Physical Chemistry A | 2017年 / 91卷
关键词：
succinic acid; nickel(II) ions; cobalt(II) ions; ethanol; stability constants of coordination compounds; changes of Gibbs energy of transfer;
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摘要：
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 (XEtOH = 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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页码：662 / 666
页数：4
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