2-(3’,4’-二羧基苯氧基)苯甲酸配体桥联的锌(Ⅱ)配合物的合成、结构及荧光性质

以2-(3’,4’-二羧基苯氧基)苯甲酸(H3DPBA)和1,3-二(4-吡啶基)-丙烷(bpp)为配体,与Zn(Ac)2通过水热反应,获得了一维链状配合物Zn(DPBA)(bpp)。该配合物的一个不对称单元包括一个Zn(Ⅱ)离子,一个DPBA配体和一个bpp配体。Zn(Ⅱ)离子与四个氧原子及一个氮原子配位,其配位数为5。固态配合物在375nm处出现强的发射峰,来自于配体的π~*—π跃迁。与配体的荧光发射光谱比较,配合物的荧光发射峰发生了蓝移,而且配合物的荧光发射强度有大幅度增强。讨论了配合物在常见溶剂中和金属阳离子中的荧光性质。实验结果表明不同有机小分子或不同金属阳离子对配合物的荧光强度有不同程度的影响,有机小分子硝基苯和Fe~(3+)使配合物荧光猝灭,该Zn(Ⅱ)-配合物可用于硝基苯的检测以及水和乙醇体系中Fe~(3+)的检测。

The Synthesis,Crystal Structure and Fluorescence Properties of Zinc Complex with 2-(3',4'-Dicarboxyphenoxy)Benzoate

In this paper,Zn (DPBA)(bpp)complex was synthesized with 2-(3',4'-dicarboxyphenoxy)benzoate (DPBA)as the first ligand,and 1 ,3-bis (4-pyridyl)-propane (bpp)as the second ligand.The complex shows a one-dimensional chain structure, and its asymmetric unit includes one Zn(Ⅱ),one DPBA ligand and one bpp ligand.Zn(Ⅱ)ion is coordinated with four oxygen atoms and one nitrogen atom.The complex has good fluorescence property with a wide emission band appearing at 375 nm, which is theπ?—πtransition of the ligand.Compared with the fluorescence emission of the ligands,the emission peak of the complex is blue shifted,and the emission intensity is greatly enhanced.The fluorescence properties of the complex in common solvents and metal cations were also studied.Experimental results show that the influence of different small organic molecules or different metal cations on the fluorescence of the complex,small organic molecule nitrobenzene and Fe3+ make the fluorescence quenching of the complex.Thus,the complex can be used for the detection of nitrobenzene and Fe3+ ion in the water and ethanol system.