Abstract
The heat effects of the complexation reactions of nickel(II) with a glycylglycinate ion in a water-dimethylsulfoxide solvent in a range of compositions of 0.00–0.60 molar parts of dimethylsulfoxide (DMSO) (an ionic strength of 0.1 was maintained using sodium perchlorate) were determined by means of calorimetry at 298.15 K. It is established that the exothermicity of complexation reactions rises by the first two steps and falls upon the addition of a third glycylglycinate anion with an increase in the concentration of DMSO. It is shown that the formation of mono- and bis-glycylglycinate complexes of nickel(II) in a water-DMSO solvent is determined mostly by the enthalpic contribution. It is concluded that the formation of tris-ligand complexes is more associated with the entropic contribution.
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Original Russian Text © V.V. Naumov, Yu.A. Kovaleva, V.A. Isaeva, T.R. Usacheva, V.A. Sharnin, 2014, published in Zhurnal Fizicheskoi Khimii, 2014, Vol. 88, No. 6, pp. 969–972.
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Naumov, V.V., Kovaleva, Y.A., Isaeva, V.A. et al. Dependence of the enthalpies of formation of glycylglycinate complexes of nickel(II) on the composition of a mixed water-dimethylsulfoxide solvent. Russ. J. Phys. Chem. 88, 932–935 (2014). https://doi.org/10.1134/S0036024414060193
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DOI: https://doi.org/10.1134/S0036024414060193