Luminescence and magnetic properties of mixed-ligand europium trifluoroacetates

The luminescence and magnetic properties of mixed-ligand europium trifluoroacetates with nitrogen- and phosphorus-containing neutral ligands [Eu(TFA)(3) center dot 3H(2)O](2) and Eu(TFA)(3) center dot 2D center dot nH(2)O were studied (here TFA is the trifluoroacetic acid anion, and D is Phen (1,10-phenanthroline), n = 1; DMF (dimethylformamide), n = 1; or TPPO (triphenylphosphine oxide), n = 3). The molar magnetic susceptibility increased in the series of complex compounds Eu(TFA)(3) center dot 2Phen center dot H2O < [Eu(TFA)(3) center dot 3H(2)O](2) < Eu(TFA)(3) center dot 2DMF center dot H2O < Eu(TFA)(3) center dot 2TPPO center dot 3H(2)O. Correlations were found between the luminescent and magnetic characteristics of the complex compounds.