Russian Journal of Physical Chemistry A

, Volume 93, Issue 8, pp 1460–1464 | Cite as

Constants of the Stability of Glycylglycinate Complexes of Copper(II) in Water–Ethanol Solutions

  • V. A. IsaevaEmail author
  • A. S. Molchanov
  • K. A. Kipyatkov
  • V. A. Sharnin


Constants of the stability of glycylglycinate copper(II) complexes in water–ethanol solutions of variable composition are determined via potentiometry at a temperature of 298 K and an ionic strength of the solutions of 0.1 (NaClO4). It is established that the formation of normal and deprotonated mono- and bis-glycylglycinate copper(II) complexes is possible in solutions. When the concentration of the organic component in a solution is raised, the stability of copper(II) glycylglycinates increases. The constants of glycylglycine peptide group deprotonation were calculated. The contributions from the solvation reagents to the change in the Gibbs energy of the investigated equilibrium processes is estimated as a function of the concentration of ethanol in a solution.


glycylglycine copper(II) complexation stability constant water–ethanol solvent 



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Copyright information

© Pleiades Publishing, Ltd. 2019

Authors and Affiliations

  • V. A. Isaeva
    • 1
    Email author
  • A. S. Molchanov
    • 2
  • K. A. Kipyatkov
    • 2
  • V. A. Sharnin
    • 1
  1. 1.Ivanovo State University of Chemistry and TechnologyIvanovoRussia
  2. 2.Kostroma State UniversityKostromaRussia

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