Effects of bis(salicylidene)trimethylenediamine and 2,2′-bipyridyl on luminescence and extraction of tris(pivaloyltrifluoroacetonato)Eu(III)

The UV, excitation and luminescence spectra of EuA3B to be the extracted species as well as the extraction of Eu(III) with pivaloyltrifluoroacetone, HA, and/or Lewis bases, B (2,2′-bipyridyl, bpy, and bis(salicylidene)trimethylenediamine, H2saltn) into CHCl3 were measured. The results are summarized: the stability constants of EuA3bpy and EuA3H2saltn complexes are 5.85 ± 0.05 and 2.95 ± 0.06 as View the MathML sourcelogβ¯1View the MathML source(β¯1=[EuA3B]o[EuA3]o-1[B]o-1), respectively. The present results suggest that because of intramolecular hydrogen bonding, the stability and luminescence of the H2saltn complex including the quantum yield are smaller than those of the bpy complex. The weaker luminescence is also concerned with the fact that the less stable complexes easily dissociate in solvents to diminish the essential concentration.