对苯基苯甲酸铽三元配合物荧光性质研究

用对苯基苯甲酸和邻菲罗啉与氯化铽在甲醇溶液中合成了三元稀土有机配合物.利用元素分析、红外分析等对配合物的组成和结构进行表征,确定了配合物的组成和可能的配位结构.结果表明,羧基氧和邻菲罗啉氮原子均与稀土离子配位,配体对苯基苯甲酸可有效地传送能量,使荧光强度明显增强.测定了配合物在固态及二甲亚砜溶液中的荧光衰减曲线,并以Y2O3为参比,测量了配合物的荧光量子产率,在最大激发波长292 nm处的荧光量子产率是0.34.并由Gd-H2L配合物的磷光光谱的最大发射波长计算出配体H2L的最低三重态能级,讨论了配合物的能量转移机理.该配合物的磁性在0~300 K范围内测定表明,该配合物具有反铁磁性.

The luminescence of Tb (Ⅲ) complexes with p -phenyl benzoic acid

Rare earth complexes were synthesized by using Tb(III) as the centralion,p phenyl benzoic acid as the ligand,and phen as the second ligand for the first time. Probable coordination structure and composition of the rare earth complexes were determined by using IR spectra,fluorescence spectra,elemental analysis,and UV absorption.The results show that the oxygen atoms from p phenyl benzoic acid and nitrogen atoms from phen coordinate to the rare earth ions in the complexes.The fluorescence emission of Tb~(3 ) ion can be greatly enhanced,because the energy was transferred efficiently by using p phenyl benzoic acid as the ligand.The lifetime decay curves were measured.The fluorescence quantum yields were investigated by comparison with a luminescence standard,and the yields were 0.34,0.12 for the solid and in DMSO.The lowest triplet level of H_2L ligand was calculated from the phosphorescence of Gd-H_2L complex,and the energy transfer mechanism in the complex was discussed.Magnetic property was measured at 0~300 K and the complex is antiferromagnetic.