吡啶二甲酸类配体-EDTA-铽三元配合物的荧光性能

Luminescence of Terbium Chelates with Substituted Pyridine-2, 6-Dicarboxylic Acid Derivatives by Synergistic Effect of EDTA

对几种吡啶 2 ,6 二甲酸类配体与EDTA、铽的三元配合物在溶液中的荧光性能进行了研究 ,溶液pH值和溶剂效应对体系荧光的影响也分别进行了探讨。 4 甲氧基吡啶 2 ,6 二甲酸 (MDPA)和 4 乙氧基吡啶 2 ,6 二甲酸 (EDPA)等配体在这种三元体系中的敏化性能比常用的吡啶 2 ,6 二甲酸 (DPA)好 ,其中 4 乙酰氨基吡啶 2 ,6 二甲酸 (ADPA)特别优异。不论在二元配合物体系还是在三元配合物体系中 ,均具有发光强度大、寿命长的特点。

Some spectral properties and luminescence intensities of Tb 3+ chelates of substituted pyridine 2,6 dicarboxylic acids and 4 phenyl pyridine 2,6 dicarboxylic acid analogues were measured in some solutions (H 2O and EtOH etc.) by synergistic effect of EDTA. The substitution at the aromatic ring has a significant effect upon the observed luminescence intensities, excitation wavelengths, and lifetime of the complexes. Moreover, the changes in the environment cause great variation in those properties of certain Tb 3+ chelates. The results show that some of the chelates (4 acetaminopoxypyridine 2,6 dicarboxylic acid, 4 ethoxypyridine 2,6 dicarboxylic acid and 4 methoxypyridine 2,6 dicarboxylic acid etc.) have a stronger emission and longer lifetime at room temperature and may thus be used as perfectly sensitizers in fluorescence analysis.