Abstract
The ligand substitution in Eu(AA)3 · Phen-CDCl3-TFA systems, where AA is acetylacetone, Phen is 1,10-phenanthroline, and TFA is trifluoroacetic acid was studied at various molar ratios (m) of competing ligands (m = TFA/AA) using NMR (1H, 19F) and luminescence spectroscopy. The formation of mixed Eu(AA)2(TFA) · Phen and Eu(AA)(TFA)2 · Phen complexes in the resultant solutions was attested. The luminescence spectra were studied. The competitive capacity of TFA was ascertained to be higher than that of AA. Depending on the m value, the substitution of acido ligands was shown to occur successively according equations Eu(AA)3 · Phen + (TFA)n = Eu(AA)3 − n(TFA)n · Phen + (AA)n (n = 1, 2, 3).
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