Syntheses,characteristics and photo-fluorescence properties of ternary europium complexes

Using benzoic acid,phthalic acid,m-phthalic acid,o-aminobenzoic acid,salicylic acid,acrylic acid,methacrylic acid and thenoyltrifluoroacetone as the first ligands and diantipyrylmethane,tri-n-octyl phosphine oxide,2,2'-bipyridine,o-phenanthroline,o-phenanthroline-nitrogen-oxide as the second ligands,a series of ternary complexes of europium were synthesized,and their compositions were identified by elemental analyses.Ultraviolet(UV),infra-red(IR) and fluorescence spectra of the complexes have been investigated.The UV spectra indicated that the complexes' ultraviolet absorption is mainly the ligands' absorption,but the location of peak is drifted.The IR spectra showed that the IR spectra of the complexes are different from those of free ligands and the band at 400～500cm-1,due to the stretching vibration of Eu-O, is absent from free ligands.The fluorescence properties of them were investigated by using luminescence spectrum,the results showed that the efficiency of energy transfer in ternary rare earth complexes are improved and the intensity of fluorescence are enchanced when the second ligands are introduced in the complexes.