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Comparative Study of the Formation of Heterometallic Diethylenetriaminpentaacetates of Cobalt(II), Nickel(II), and Copper(II) in Aqueous Solutions

  • XIV INTERNATIONAL SCIENTIFIC CONFERENCE “PROBLEMS OF SOLVATION AND COMPLEX FORMATION IN SOLUTIONS”
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Abstract

The formation of heterobinuclear complexes of cobalt(II), nickel(II), and copper(II) with diethylenetriaminepentaacetic acid (dtpa, H5dtpa) in aqueous solutions was studied by spectrophotometry. The effect the pH has on the formation of the coordination sphere of heterobimetallic complex particles in ternary systems with an equimolar ratio of components is established. The thermodynamic stability of homo- and heterobinuclear complexes is estimated via mathematical modeling of the formation of complex particles of a certain stoichiometry with limited logarithmic processing of experimental data for specific polycomponent systems. Numerical values of logarithms of the constant of stability (\(\log \beta \)) of homobinuclear chelates [Me2dtpa]− are 24.46 ± 0.1; 25.53 ± 0.1 and 27.03 ± 0.1 for Co(II), Ni(II), and Cu(II), respectively. Values \(\log \beta \) are 25.43 ± 0.1; 25.60 ± 0.1; 17.83 ± 0.09; and 27.57 ± 0.1 for heterobimetallic diethylenetriaminepentaacetates [CoNidtpa]–, [CoCudtpa]–, [NiCuHdtpa]0, and [NiCudtpa]−, respectively.

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Authors and Affiliations

  1. State University of Humanities and Technology, 142611, Orekhovo-Zuyevo, Russia

    T. V. Popova

  2. Mari State University, 424000, Yoshkar-Ola, Russia

    N. V. Shcheglova

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  1. T. V. Popova
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  2. N. V. Shcheglova
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Correspondence to T. V. Popova.

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Materials from this work were presented at the XIV International Scientific Conference held in Ivanovo from September 20 to 24, 2021.

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Popova, T.V., Shcheglova, N.V. Comparative Study of the Formation of Heterometallic Diethylenetriaminpentaacetates of Cobalt(II), Nickel(II), and Copper(II) in Aqueous Solutions. Russ. J. Phys. Chem. 96, 1170–1174 (2022). https://doi.org/10.1134/S003602442206019X

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