利用水热法合成了一种新的配合物, ［Eu(PABA)3(phen)(H2O)］·2H2O(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Eu3+的配位数9, 环境为{EuO7N2}, 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618 nm处出现了2条尖锐的发射峰, 分别对应于Eu3+的5D0→7F1和5D0→7F2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-, Pb2+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-, Pb2+和硝基苯的荧光探针。

The complex ［Eu(PABA)3(phen)(H2O)］·2H2O (HPABA=p-aminobenzate, phen=1,10-phenanthroline) was obtained by hydrothermal method. It is mononuclear molecule containing {EuO7N2} unit. The coordination number of Eu3+ 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 618 nm, corresponding to the 5D0→7F1 and 5D0→7F2 transitions of Eu3+ 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-, Pb2+ and nitrobenzene based on fluorescence quenching mechanism.