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A ligand, N1,N4-di(pyridin-2-yl)succinamide (L) and its lanthanide(Ⅲ) complexes (RE= La, Eu, Tb, Gd, Yb ) were synthesized and characterized in detail. The results indicate that the composition of the binary complexes is determined as [REL(H_2O)_2(NO_3)_2] NO_3, that the complexes are 1∶1 electrolytes in DMF, and that the Tb 3+ complex has brightly green fluorescence in a solid state. At the same time, the energy levels of the excited triplet states for the six ligands were determined to be 22989 cm -1 . The fact that the ligand sensitize Tb 3+ complexes was explained by the relative energy gap between the lowest triplet energy level of the ligand (T) and 5D_J of Tb 3+ or Eu 3+ . When 2000 cm -1 <ΔE(T-5D_4)<3000 cm -1 , the luminescent intensity of the Tb 3+ complex is stronger. When 3000 cm -1 <ΔE(T-5D_1), the luminescent intensity of the Eu 3+ complex is weaker or close to nil. This means that the triplet energy level of the ligand is a chief factor that dominates RE 3+ luminescence.
A ligand, N1, N4-di (pyridin-2-yl) succinamide (L) and its lanthanide (Ⅲ) complexes (RE = La, Eu, Tb, Gd, Yb) were synthesized and characterized in detail. the composition of the binary complexes is determined as [REL (H_2O) _2 (NO_3) _2] NO_3, that the complexes are 1: 1 electrolytes in DMF, and that the Tb 3+ complex has brightly green fluorescences in a solid state. At the same time, the energy levels of the excited triplet states for the six ligands were determined to be 22989 cm -1. The fact that the ligand sensitize Tb 3+ complexes was explained by the relative energy gap between the lowest triplet energy level of the ligand (T) and 5D_J of Tb 3+ or Eu 3+. When 2000 cm -1 <ΔE (T-5D_4) <3000 cm -1, the luminescent intensity of the Tb 3+ complex is stronger. When 3000 cm -1 <ΔE (T-5D_1), the luminescent intensity of the Eu 3+ complex is weaker or close to nil. This means that the triplet energy level of the ligand is a chief factor that dominates RE 3+ lumines cence.