基于柔性双咪唑配体的镉配合物的合成、晶体结构及荧光性能研究

Synthesis,Crystal Structure and Fluorescence of a Cd Complex Based on Flexible Bis-Imidazole Ligand

以柔性双咪唑配体1,4-二(2-甲基-咪唑基)甲苯(L)与过渡金属镉盐和5-溴间苯二甲酸在溶剂热法中合成了一个新型的配合物,X-单晶衍射结果表明:该配合物属于正交晶系,Pnna空间群,Cd原子与5-溴间苯二甲酸中的羧基氧通过双齿螯合模式形成一维链状结构,含氮配体中的氮原子采用单齿桥联模式从不同方向无限延展最终形成三维的三重贯穿结构.此外,探究该配合物的荧光传感性能,结果表明其对有机溶剂丙酮和金属Fe3+都表现了重要的猝灭效应,具有高度的选择性和灵敏度.

The title complex was synthesized with Cd(NO 3)2·6H2O and 1,4-di(2-methyl-imidazolyl)methylbenzene ligand in the presence of 5-bromide-isophthalate under the solvothermal condition.The X-ray diffraction result indicates that the complex crystallizes as an orthorhombic crystal system with space group of Pnna.In the complex,the cadmium cation coordinates with the oxygen atom of in the bidentate chelate to form a 1D chain.It forms a 3D framework by bridging with the nitrogen atom from the ligand,extending to different directions,and consequently forming a three-fold interpenetration structure.Moreover,the complex was examined as a potential fluorescence sensor.Our result show that acetone and Fe^3+could be employed to quench the fluorescence of the complex,and this quenching behavior demonstrated high selectivity and sensitivity.