Study On The Preparation And Luminescence Properties Of Rare Earth(Eu,Tb) Complexes With β-Diketone

In this paper, two novel (3-diketone1-(4-bromophenyl)-3-phenylpropane-1,3-dione (HL1) and1-(4-aminophenyl)-3-phenylpropane-1,3-dione (HL2) were synthesized by classical Claisen condensation reaction. In the synthetic process of novel β-diketone, the conclusion reported is that the optimal yield rate of HL1and HL2can be obtained at the conditions of the aromatic ketones and aromatic esters of the ratio of1:4and80℃。With the novel β-diketone (HL1or HL2) as the first ligand and1,10-phenanthroline (phen) or2,2’-bipyridin(bipy) as the secondary ligand, eight new rare-earth Eu(III) and Tb(III) ternary complexes were prepared. The composition were determined by elemental analysis. IR spectra indicated that rare earth ions were coordinated with oxygen atoms of the first ligand and two nitrogen atoms of the secondary ligand. UV spectra showed that the main absorption was from the first ligand in the complexes, the secondary ligand was acted as the synergistic coordination. Fluorescence spectra demonstrated that the emission intensity of the complexes were obviously different. The difference was influenced by the matching of energy level between the triplet state of the β-diketone ligand and the emission energy of rare-earth ion and ligand structure.