5-氨基间苯二甲酸锰配位聚合物的合成、晶体结构及荧光传感性能

Synthesis,crystal structures and fluorescence sensing of Mn(Ⅱ)coordination polymers based on 5-aminoisophthalic acid

采用溶剂热法,以5-氨基间苯二甲酸为定向配体,与金属盐四水乙酸锰反应,构筑了1个新型的锰配位聚合物[Mn(C8H5NO4)(H2O)]n·2H2O.通过红外吸收光谱(IR)、元素分析和X-射线单晶衍射等方法对锰聚合物的结构进行表征.该锰配位聚合物属于三斜晶系,空间群为Pī.结构中的中心离子MnⅡ与来自4个不同配体的4个羧酸O原子、1个氨基N原子和1个水分子上的O原子配位,形成了1个六配位的八面体构型MnO5N.通过中心金属离子MnⅡ与5-氨基间苯二甲酸上的N,O原子配位不断延伸形成具有孔洞结构的2D网状构型.研究目标聚合物的荧光传感性能,可通过猝灭现象选择性的检测溶液中的Mn2+离子.

The novel manganese coordination polymer[Mn(C8H5NO4)(H2O)]n·2 H2O was synthesized by solvothermal method using 5-aminoisophthalic acid as the ligand and Mn(CH3COO)2·4H2O as the metal ion source.The coordination polymer was characterized by IR,elemental analysis and Xray single crystal diffraction.The coordination polymer belongs to the triclinic system,with space group of Pī.Each central ion MnⅡis six coordinated by four O atoms,one N atom from 5-aminoisophthalic acid and one O atom from solvent water molecule to give a octahedral geometry MnO5N.Through central metal ion coordinated by O and N atoms from 5-aminoisophthalic acid,to further construct two-dimensional(2D)network configuration with porous structure.The fluorescence sensing ability of the coordination polymer was studied.The results shown that the effects of different metal ions on the fluorescence of the complex was difference,it can be used as a fluorescence sensing material to detect Mn2+ion via a fluorescence quenching mechanism.