不同有机碱对铕-2-羟基喹啉-4-羧酸配合物发光性能的影响

Influence of Different Organic Bases on The Luminescence Properties of Europium Complexes with 2-Hydroxyquinoline-4-Carboxylic Acid

分别在有机碱三乙胺、三丙胺和三丁胺的作用下,使用2-羟基喹啉-4-羧酸(H2hqc)与Eu Cl3·6H2O反应制备了3种配合物Eu(Hhqc)3(TEL)、Eu(Hhqc)3(TPL)和Eu(Hhqc)3(TBL)。通过元素分析、热重分析、摩尔电导率、紫外光谱、荧光光谱、荧光寿命和量子产率等对配合物进行了表征。所有配合物均在580,592,613,654,702 nm附近产生5条谱带,为Eu3+的特征发射,归属为5D0→7FJ(J=0,1,2,3,4)能级间的跃迁,荧光寿命分别为2.22,3.29,3.31 ms,量子产率分别为0.011,0.019,0.028。随着有机胺碳链长度的增加,配合物的荧光强度依次增大,表明有机碱参与了配合物的分子组成。

Three kinds of Europium complexes, Eu(Hhqc)3(TEL), Eu(Hhqc)3(TPL) and Eu-(Hhqc)3(TBL) were synthesized by the reaction of 2-hydroxyquinoline-4-carboxylic acid (H2hqc) with EuCl3·6H2O under the treatment with triethylamine (TEL), tripropylamine (TPL) and tribu-tylamine ( TBL) , respectively. Three complexes were characterized by elemental analysis, thermo-gravimetric analysis, molar conductivity, UV spectra, fluorescence spectra, fluorescence life-time and quantum yield methods. Each complex shows five emission bands at 580, 592, 613, 654, 702 nm, which are assigned to the characteristic emission 5D0→7FJ(J=0, 1, 2, 3, 4) transitions of Eu3+. The fluorescence life-times are 2. 22, 3. 29, 3. 31 ms, the quantum yields are 0. 011, 0. 019, and 0. 028 for Eu(Hhqc)3(TEL), Eu(Hhqc)3(TPL) and Eu(Hhqc)3(TBL), respective-ly. The fluorescent intensities increase with the increasing of carbon chain length of the organic ba-ses, indicating the organic bases are involved in the formation of europium complexes.