Thermodynamics of complexation of yttrium-family lanthanide ethylenediamine disuccinates at 298.15 K

A. I. Lytkin; N. V. Chernyavskaya; A. S. Chernov; O. N. Krutova; V. E. Litvinenko

doi:10.1134/S0036023616120111

Thermodynamics of complexation of yttrium-family lanthanide ethylenediamine disuccinates at 298.15 K

Authors: Lytkin A.I.¹, Chernyavskaya N.V.¹, Chernov A.S.¹, Krutova O.N.¹, Litvinenko V.E.²
Affiliations:
1. Ivanovo State University of Chemistry and Technology
2. Kostroma State University
Issue: Vol 61, No 12 (2016)
Pages: 1620-1623
Section: Physical Chemistry of Solutions
URL: https://journals.rcsi.science/0036-0236/article/view/166997
DOI: https://doi.org/10.1134/S0036023616120111
ID: 166997

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Abstract

Complexation between ethylenediamine-N,N'-disuccinic acid (Н₄Y, EDDS) and Er³⁺, Yb³⁺, and Lu³⁺ ions in aqueous solutions is studied by calorimetry and pH measurements. The thermodynamic parameters (logK, ΔrG, ΔrH, and Δ_rS) of formation of LnY–and LnHY complexes at 298.15 K and ionic strength I = 0.5(KNO₃) are determined. Changes in the thermodynamic parameters of reactions while moving along the lanthanide series are discussed.