新型双β-二酮稀土配合物的荧光性质

稀土离子因其特有的结构,具有较好的荧光特性,能与许多有机配体形成有良好荧光性能的配合物。简要介绍了双β-二酮配体的合成,研究了Eu³⁺、Tb³⁺双β-二酮配合物体系的荧光性能,该体系具有良好的荧光特性。通过对其紫外光谱、荧光光谱测定和对比,分析了不同因素,包括溶剂、配体结构、pH值等因素对体系荧光强度的影响。实验结果表明:稀土(Eu³⁺,Tb³⁺)-β-二酮体系在乙醇溶液中其荧光强度比在水溶液中大得多;乳化剂OP能增强体系荧光强度;在pH约为6时荧光最强;不同结构的β-二酮配体与稀土离子所形成的配合物的荧光强度顺序为H₂L¹>H₂L²>H₂L³;Eu³⁺比Tb³⁺能更好地与这些β-二酮匹配,其中Eu³⁺与β-二酮配体H₂L¹形成的配合物荧光性能最好。

Fluorescence Properties of Rare Earth Complexes with Bis-β-ketone

Because its unique structure, the rare earth ion has the better fluorescence specific, and could react with many organic ligands to form the good fluorescence complexes. This article simply has introduced syn-thesis of bis β-ketone and studied fluorescence performance of Eu³⁺ ,Tb³⁺-bis β-ketone system. This system has the good fluorescence characteristic through its fluorescence spectrum determination and contrast, analysis of the different factor, including the solvent, ligand structure, the influence of pH value on the fluorescence intensity. The experiment result showed: in the system of rare earth(Eu³⁺ or Tb³⁺)bis-β-ketone, the luminescence intensity was higher in the ethanol than that in the water. Emulsifier OP enhanced the luminescence greatly.The effect of pH was investigated in the range of 4¹0, but the luminescence signal was observed to be the strongest at pH=6. The effect of different ligands was studied also, and the sequence of the enhance is: H₂L¹ >H₂L² > H₂L³. The Eu³⁺ has a nice match with the bis-β-ketone ligands, but Tb³⁺ didn't match with the bis-β-ketone ligands perfectly, and the luminescence intensity of the Eu³⁺-H₂L¹ complex is the strongest in three ligands complexes.