Thermodynamics of Cu²⁺ Complexation
with Ethylenediamine-N, N '-Disuccinic Acid
in Aqueous Solution

A. I. Lytkin, N. V. Chernyavskaya, V. M. Nikol’ski, and N. I. Lytkina

Ivanovo State University of Chemical Technology, pr. F. Éngel’sa 7, Ivanovo, 153000 Russia

Tver State University, ul Zhelyabova 33, Tver, 170000 Russia

Received May 20, 2002

Abstract—Calorimetric enthalpies of ethylenediamine-N, N '-disuccinic acid (H₄R) complexation with a Cu²⁺
ion have been determined at 298.15 K and ionic strengths of 0.5, 1.0, and 1.5 (KNO₃). Thermodynamic char-
acteristics of formation have been calculated for complexes CuR^2– and CuHR^– at fixed and zero values of ionic
strength.

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