铕Ⅲ-对苯二甲酸-2-噻酚甲酰三氟丙酮多核体系的荧光增强及其应用  

Fluorescence enhancement of europium Ⅲ-terephthalic acid-2-thenoyltrifluoroacetone polynuclear system and its application

作　　者：赵学辉[1,2] 黄可龙[2] 焦飞鹏[2] 刘志国[1] 罗婕[1] 

机构地区：[1]湖南工业大学化学化工学院,湖南株洲412007 [2]中南大学化学化工学院,湖南长沙410083

出　　处：《冶金分析》2010年第9期14-17,共4页Metallurgical Analysis

基　　金：国家自然科学基金资助(50874041);湖南省自然科学基金资助(08JJ5036)

摘　　要：以对苯二甲酸(TPA)与2-噻酚甲酰三氟丙酮(HTTA)为配体研究了Eu3+在其乙醇溶液中的荧光增强效果。研究结果表明,在pH为6.8的乙醇溶液中,对苯二甲酸与2-噻酚甲酰三氟丙酮混合配体的敏化可使Eu3+荧光强度提高三个多数量级。在三苯基氧化膦(TP-PO)存在的条件下,稀土La3+、Gd3+、Y3+与Eu3+-TPA-TTA-TPPO形成的多核发光体系具有很强的发光效果,据此建立了测定稀土样品中痕量铕的新方法,方法线性范围为4.0×10-8～3.0×10-6mol/L,检出限达6.0×10-10mol/L。用此体系对4个人工合成的稀土混合物样品进行分析,相对误差为1.7%～3.8%,相对标准偏差为1.7%～3.5%。Fluorescence enhancement of europium Ⅲ in ethanol solution was studied with terephthalic acid（TPA） and 2-thenoyltrifluoroacetone（HTTA） as ligands.The results indicated that,the sensibilization of TPA-HTTA mixed ligand enhanced the fluorescence intensity of Eu3＋ by more than three orders of magnitude in ethanol solution at pH 6.8.In the presence of triphenylphosphine oxide（TPPO）,the formed multi-nuclear luminescence system between rare earths（La3＋,Gd3＋,Y3＋） and Eu3＋-TPA-TTA-TPPO had strong luminous effect.Based on this fact,a new determination method for trace europium in rare earth samples was established.The linear range of method was 4.0×10-8-3.0×10-6 mol/L with detection limit of 6.0×10-10 mol/L.This system was applied to the analysis of four synthesized rare earth mixture samples with relative error of 1.7 %-3.8 % and relative standard deviation（RSD） of 1.7 %-3.5 %.

关 键 词：荧光增强 对苯二甲酸 2-噻酚甲酰三氟丙酮 铕 

分 类 号：O621.13[理学—有机化学]