Four new complexes of rare earths with a triaza-crown ether (L) derived from N3O2-macro cycle 1,12,15-triaza-3, 4: 9,10-dibenzo-5, 8-dioxacycloheptadecane were synthesized and characterized by elemental analysis, IR, molar conductance, TG-DTA analysis and fluorescence spectra. The composition of the complexes determined as [RE(NO3)3L*3H2O]*H2O (RE=Sm, Eu, Tb and Dy). It is found that Sm3+, Eu3+, Tb3+ and Dy3+ complexes all show strong fluorescence emission in the solid state. Among these complexes, Tb3+ complex has the strongest luminescence intensity. It shows that the ligand L triplet state energy matches 5D4 energy level of Tb3+. In the Eu3+ complex, η(5D0→7F2/5D0→7F1) is 2.6, which indicates that Eu3+ locates at the asymmetric coordination field.
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