Thermodynamics of the Formation of a Nickel(II) and Glycylglycine Complex in an Aqueous Solution

Direct calorimetry is used to determine the enthalpies of formation of complexes of Ni(II) and diglycine in aqueous solutions with ionic strengths of 0.2, 0.5, and 1.0 (KNO 3 ) at a temperature of 298.15 K. Standard thermodynamic values Δ r H °, Δ r G °, and Δ r S ° of complex formation in the consi...

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Bibliographic Details
Published in:Russian Journal of Physical Chemistry A 2022-09, Vol.96 (9), p.1909-1916
Main Authors: Gorboletova, G. G., Bychkova, S. A., Frolova, K. O.
Format: Article
Language:English
Subjects:
Aqueous solutions
Chemical Thermodynamics and Thermochemistry
Chemistry
Chemistry and Materials Science
Complex formation
Enthalpy
Glycine
Physical Chemistry
Thermodynamics
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Summary:Direct calorimetry is used to determine the enthalpies of formation of complexes of Ni(II) and diglycine in aqueous solutions with ionic strengths of 0.2, 0.5, and 1.0 (KNO 3 ) at a temperature of 298.15 K. Standard thermodynamic values Δ r H °, Δ r G °, and Δ r S ° of complex formation in the considered system are calculated. A comparative analysis is performed of the obtained data and known thermodynamic values of complex formation in Ni 2+ –glycine and Ni 2+ –triglycine systems. Possible structures are proposed for diglycinate complexes with formulas NiL + , NiH –1 L, NiL 2 , NiH –2 , Ni , and NiH –3 .
ISSN:0036-0244
1531-863X
DOI:10.1134/S0036024422090126