基于对氨基苯甲酸和邻菲罗啉构筑的铕(Ⅲ)配合物的荧光传感  

Fluorescence Sensing Based on the Europium (Ⅲ) Complex with p-Aminobenzoic Acid and 1,10-Phenanthroline

作　　者：周鑫[1] 罗李林 李夏[1] ZHOU Xin LUO Li-lin LI Xia(Department of Chemistry, Capital Normal University, Beijing 100048, China)

机构地区：[1]首都师范大学化学系,北京100048

出　　处：《光谱学与光谱分析》2017年第9期2813-2816,共4页Spectroscopy and Spectral Analysis

基　　金：国家自然科学基金项目(21471104);首都师范大学交叉科研项目(009175302600)资助

摘　　要：利用水热法合成了一种新的配合物,[Eu(PABA)_3(phen)(H_2O)]·2H_2O(1)(PABA=对氨基苯甲酸根,phen=1,10-邻菲罗啉)。该配合物为单核分子,中心离子Eu^(3+)的配位数9,环境为{EuO_7N_2},形成了一种扭曲的单帽四方反棱柱多面体。该配合物通过氢键进一步构筑成为三维超分子结构。配合物1在紫外灯下显现为亮红色,其荧光光谱在595和618nm处出现了2条尖锐的发射峰,分别对应于Eu^(3+)的~5 D_0→~7 F_1和~5 D_0→~7 F_2跃迁。研究了水溶液中不同阴离子、阳离子以及溶剂对配合物1荧光的影响,实验结果表明不同阴离子、阳离子和溶剂对该配合物的荧光强度有不同程度的影响,在各自实验条件下,F^-,Pb^(2+)和硝基苯对该配合物有显著的荧光猝灭效应。基于荧光猝灭机理,该配合物可作为F^-,Pb^(2+)和硝基苯的荧光探针。The complex[Eu（PABA）_3（phen）（H_2O）]·2H_2O（HPABA=p-aminobenzate,phen=1,10-phenanthroline）was obtained by hydrothermal method.It is mononuclear molecule containing{EuO_7N_2}unit.The coordination number of Eu^（3＋）ion is nine,forming a distorted monocapped square antipriosm.The molecules are linked by hydrogen bonding to a three-dimensional structure.The complex displays a bright red light under ultraviolet lamp.The emission peaks of the fluorescence spectra of the complex are at 595 and 618nm,corresponding to the ~5 D_0→~7 F_1 and ~5 D_0→~7 F_2 transitions of Eu^（3＋）ion.In addition,the effects of different anions,metal ions and solvents on the fluorescence of the complex was studied.The experimental results show that this complex could be a potential luminescent probe for detecting F^-,Pb^（2＋） and nitrobenzene based on fluorescence quenching mechanism.

关 键 词：铕配合物 对氨基苯甲酸 荧光传感 

分 类 号：TH89[机械工程—仪器科学与技术]