2,4,6-三吡啶基三嗪-芳香羧酸镝配合物的合成及其荧光性能

分别以2,4,6-三吡啶基三嗪( TPTZ)、对羟基苯甲酸和对苯二甲酸为配体,以Dy3+为中心合成了不同组成的5种配合物.对其进行了元素分析、紫外光谱、红外光谱、荧光激发和发射光谱的测定.推测配合物的组成分别为:(1)Dy(TPTZ)(NO3)3(C2H5OH)·H2O; (2) Dy (TPTZ)2 (NO3)3 (...

Synthesis and Fluorescence Properties of Complexes of Dysprosium with 2,4,6-tris-(2-pyridyl)-s-triazine

2,4,6-Tris(2-pyridyl)-1,3,5-triazine, p-hydroxybenzoic acid and p-phthalic acid have been reported as ligands by many researchers recently. And these ligands react with rare earth ions producing the corresponding complexes, which have excellent luminous performances and are expected to be good luminescent materials. In this paper, we firstly reported that the TPTZ ligand reacted with dysprosium ion, produced the corresponding complexes. These complexes were fully characterized with UV, IR and elementary analysis. The composition of these complexes were supposed to be: (1)Dy(TPTZ)(NO₃)₃(C₂H₅OH)·H₂O; (2)Dy-(TPTZ)₂(NO₃)₃ (C₂H₅OH)·H₂O; (3)Dy₂(TPTZ)(NO₃)₆(C₂H₅OH)·2H₂O;(4)Dy(TPTZ)-(C₇H₅O₃)₃(C₂H₅OH)·2H₂O;(5)Dy₂(TPTZ)₂ (C₈H₄O₄)(NO₃)₄(C₂H₅OH)·H₂O. The oxygen atoms of nitrate and carboxyl group from aromatic acids coordinate to dysprosium ion, nitrogen atoms from TPTZ generate bonds with dysprosium ion. The formation of complex has little effect on conjugation bond π-π^* electron transition of the ligand. The luminous intensities of dysprosium complexes with different composition are different. The p-phthalic acid complex has the strongest fluorescence intensity. Fluorescence intensity of the complex (2) is stronger than complex (1), while fluorescence intensity of the complex (3) is stronger than complex (2). It shows that the more TPTZ ligands or dysprosium ions are, the stronger fluorescence intensity is. Fluorescence intensity of the complex (4) is stronger than complex (1).It shows that the p-hydroxybenzoic acid is better at absorption and transmission of light than nitrate. Fluorescence intensity of the complex (5) is the strongest in all the complexes. It shows that p-phthalicacid has the strongest absorption of light, it also shows that when Dy ions at higher concentrations, the fluorescence intensity is also stronger.