Effect of heptadentate (N4O3) tripodal Schiff base ligand and its yttrium(III) complex on the luminescence and extraction of tris(β-diketonato)europium(III)

In order to learn the effect of a Schiff base and the complex of YIII on the extraction of EuIII with β-diketones and on the luminescence of the extracted species, the extraction of EuIII with 2-thenoyltrifluoroacetone (Htta) and/or these Schiff bases, tris(5-t-butyl)salicylidenaminoethyl amine (H3L1), and its YIII complex ([YL1]) prepared, into CHCl3 was examined. Further, the luminescence and excited spectra of CHCl3 phases extracted EuIII complexes and the solutions containing tris(β-diketonato)EuIII and/or the Schiff bases were measured. On the measurement of the luminescence spectra, tris(pivaloyltrifluoroacetonato)EuIII (Eu(pta)3) as well as Eu(tta)3 was used. Synergistic effect with Htta and these Schiff bases was observed. However, proper effect of YIII was not observed. The luminescence intensity of Eu(tta)3 at 613 nm decreased with increasing concentration of H3L1 or [YL1], whereas that of Eu(pta)3 increased with increasing concentration of the ligands, but no difference between both Schiff bases was observed, because of picking up of YIII from [YL1] with the interaction between [YL1] and water.