Europium(III) and terbium(III) beta-diketonate adducts with 2,6-dimethylmorpholine: Synthesis, characterization and emission spectra

Complexes with composition Ln(2)(beta-diketonate)(6) . (dmm) (Ln = Eu, Tb; dmm = 2,6-dimethylmorpholine; beta-diketonate = 4,4,4-trifluoro-1-(2-thieny l)-1,3-butanodiate (tta); 4,4,4-trifluoro-1-phenyl-1,3-butanodionate (tfpb) and 1,1, 1-trifluoro-1,4-pentanedionate (tfa)) have been synthesized. The adducts were characterized by microanalyses, IR spectra and emission spectr a at room temperature and at 77K. The spectra of europium complexes indicat e the oligomeric at least dimeric, nature of the compounds, since the bands are broad. The number of peaks in all cases was interpreted as C-3v symmet ry around the central.