Thermodynamics of mixed-ligand complexation of mercury(II) ethylenediaminetetraacetate with histidine and lysine in aqueous solution |
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| Authors: | A M Ryzhakov M S Gruzdev D F Pyreu E V Kozlovskii R S Kumeev |
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| Institution: | 1.Ivanovo State University,Ivanovo,Russia;2.Institute of Solution Chemistry,Russian Academy of Sciences,Ivanovo,Russia |
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| Abstract: | The formation of mixed-ligand complexes HgEdtaIm2−, HgEdtaL3−, HgEdtaHL2−, and (HgEdta)2L5− (L is histidine, lysine; Im is imidazole) was studied by calorimetry, pH-metry, and NMR spectroscopy. The thermodynamic parameters
(logK, ΔrG
0, ΔrH, Δr
S) for the reactions of complex formation at 298.15 K and ion strength of 0.5 (KNO3) were determined. The most likely coordination mode for the complexone and amino acid in the mixed complexes was identified. |
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| Keywords: | |
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