Adducts of rare earth hexafluoroacetylacetonates with amino acids

Crystal different-ligand rare earth complexes with hexafluoroacetylacetone and amino acids of m(GFAA)3 2A composition, where m=La, Eu, Tb, Dy, Lu, A-glycine, α-alanine, β-alanine, valine, norvaline, asparagine, proline, are extracted for the first time. IR spectroscopic and luminescent methods have been used to characterize compound composition. Amino acid is shown to be a neutral ligand coordinating through oxygen atom of carboxyl group with conservation of betaine structure. Analysis of Stark structure of 5D0-7F1-transition in luminescence spectra of europium adducts points out monotonous decrease of ΔF1 parameter from glycine to asparagine: gly > pro > α-ala > hys > val > β-ala > Nsub(val) > ast