Thermochemical study of the complex formation of copper(II) and nickel(II) iminodiacetates with amino acids in aqueous solutions

D. F. Pyreu; M. A. Bazanova; S. N. Gridchin; E. V. Kozlovskii

doi:10.1134/S0036023616070159

Thermochemical study of the complex formation of copper(II) and nickel(II) iminodiacetates with amino acids in aqueous solutions

Authors: Pyreu D.F.¹, Bazanova M.A.¹, Gridchin S.N.², Kozlovskii E.V.¹
Affiliations:
1. Ivanovo State University
2. Ivanovo State University of Chemical Technology
Issue: Vol 61, No 7 (2016)
Pages: 909-917
Section: Physical Chemistry of Solutions
URL: https://bakhtiniada.ru/0036-0236/article/view/166648
DOI: https://doi.org/10.1134/S0036023616070159
ID: 166648

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Abstract

The formation of mixed-ligand complexes in the M(II)–Ida–L systems (M = Cu, Ni, L = His, Orn, Lys), where Ida is the iminodiacetic acid residue, was studied by pH-metry, calorimetry, and spectrophotometry. The thermodynamic parameters (logK, Δ_rG⁰, Δ_rH, Δ_rS) of formation of the complexes were determined at 298.15 K and the ionic strength I = 0.5 (KNO₃). The most probable mode of coordination of the chelating agent and the amino acid in the mixed-ligand complexes was elucidated.