Abstract
Europium(III) and yttrium(III) complexation processes in the extraction systems with β-diketones and amino acids were studied. The increase in the lanthanide distribution ratios in these systems is caused by the formation of mixed-ligand coordination compounds of lanthanides in these systems. The formation of mixed-ligand coordination compounds of lanthanides with β-diketones and amino acids in the organic phase was confirmed by IR and luminescence spectroscopy and quantum chemical calculations of the formation energies of mixed-ligand yttrium complexes with glycine and acetylacetone or hexafluoroacetylacetone. It was found that amino acid molecules form mixed-ligand compounds with lanthanide β-diketonates by coordinating the lanthanide ion by the oxygen ion of the carboxy group with retention of the betaine structure, while the amino acid NH3+ group is hydrogen-bonded to one oxygen atom of β-diketone. The possibility of effective use of europium tris-dibenzoylmethanate as a glycine receptor is demonstrated.
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Original Russian Text © N.I. Steblevskaya, M.A. Medkov, T.B. Emelina, 2015, published in Zhurnal Neorganicheskoi Khimii, 2015, Vol. 60, No. 2, pp. 294–301.
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Steblevskaya, N.I., Medkov, M.A. & Emelina, T.B. Europium and yttrium complex formation with β-diketones and amino acids. Russ. J. Inorg. Chem. 60, 252–258 (2015). https://doi.org/10.1134/S003602361502014X
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DOI: https://doi.org/10.1134/S003602361502014X