[Zn(Hcpic)·(H2O)]n配位聚合物的结构与荧光性能

Structure and Fluorescence Properties of the[Zn(Hcpic)·(H2O)]n Coordination Polymer

4-(5-羧基吡啶-2-)间苯二甲酸(H_3cpic)与硫酸锌在乙腈和水的混合溶液中通过溶剂热法合成了一种新型配位聚合物1([Zn(Hcpic)·(H2O)]n)。通过红外光谱、元素分析、X-射线粉末衍射、X射线单晶衍射等对其结构进行了表征。结构分析表明,该配位聚合物属于单斜晶系,P21/c空间群,a=14.6636(15)A,b=7.0579(7)A,c=13.8206(6)A,β=117.63(3)°,Z=4。在配位聚合物1中,金属Zn(Ⅱ)是五配位四方锥几何构型,它与氮原子以单齿形式连接,与羧基以双齿螯合方式连接形成一维"之"字链,链与链之间通过共用氧原子形成二维层状结构。此外,研究了配位聚合物1的热稳定性及荧光性能,结果表明该配位聚合物具有良好的热稳定性并且有可能成为潜在的荧光材料。

A new coordination polymer,[Zn(Hcpic)·(H2O)]n(1),was synthesized by the solvothermal reaction of 4-(5-carboxypyridinyl-2-)isophthalic acid(H3cpic)with Zinc sulfate heptahydrate in the acetonitrile and water mixed solution.The structure was characterized by Fourier transform infrared spectroscopy,elemental analyses,powder X-ray diffraction,and single-crystal X-ray diffraction analyses.Structural analysis shows that the complex crystallizes belong to the monoclinic and P21/c space group,with a=14.6636(15)A,b=7.0579(7)A,c=13.8206(6)A,β=117.63(3)°,and Z=4.In the coordination polymer 1,each Zn(Ⅱ)ion is a five-coordinated and located at the center of a distorted square pyramidal geometry.which is connected with N in a monodentate form and connected with carboxy group in a bidentate chelating manner to form a 1 D"Zigzag"chain,and extends to form 2 D rectangular grid framework by sharing oxygen atoms between chains.In addition,the thermodynamic stability and fluorescence properties of the coordination polymer 1 were investigated.The results show that the coordination polymer has good thermal stability and may become a potential optical material.