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.
Published Version
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