Mono- and dinuclear europium(III) complexes with thenoyltrifluoroacetone and 1,10-phenanthroline-5,6-dione

摘要

The N,N'-coordinated mononuclear complex Eu(TTA)(3)(pdn), prepared by treating 1,10-phenanthroline-5,6-dione (pdn) with Eu(TTA)(3)(H2O)(2) (HTTA = 2-thenoyltrifluoroacetone), may be used as a benzoquinone-like ligand through the oxygen donor atoms in reaction with an additional Eu(TTA)(3)(H2O)(2) precursor to give the dinuclear complex Eu-2(TTA)(6)(pdn). Both the mono- and dinuclear complexes were characterized by elemental analysis, IR, TG, MS, and H-1 NMR spectra. The results indicated that they both exhibited a characteristic red emission peak at 616 nm, corresponding to the D-5(0) -> F-7(2) transition of Eu(III) ions under UV excitation. Compared with the mononuclear complex, the dinuclear complex presented better thermal stability and stronger luminescence, which makes it a promising light-conversion molecular device.