Mixed complex formation of lead(II) and mercury(II) ethylenediaminetetraacetates with thiourea in an aqueous solution |
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Authors: | D. F. Pyreu E. V. Kozlovskii M. S. Gruzdev R. S. Kumeev |
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Affiliation: | 1.Ivanovo State University,Ivanovo,Russia;2.Institute of Solution Chemistry,Russian Academy of Sciences,Moscow,Russia |
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Abstract: | The formation of mixed-ligand complexes HgEdtaThio2−, HgEdtaS2O34−, PbEdtaThio2−, and Pb(Thio) i 2+, i = 1, 2; Thio is thiourea) was studied by calorimetry, pH metry, and 1H and 13C NMR spectroscopy. The thermodynamic parameters (logK, Δ r G 0, Δ r H, and Δ r S) for the formation of the complexes at 298.15 K and the ionic strength I = 0.5(NaClO4) were determined. The most probable coordination mode of the ligands in the mixed complex was considered. |
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