基于2-硝基咪唑镉二维CdIF材料的合成和晶体结构

Synthesis,and X ray single crystal structure of two-dimentional CdIF based on cadmium 2-nitroidazolate

通过将2-硝基咪唑与硝酸镉在甲醇溶剂中120℃溶剂热条件下反应,合成了1个新的[Cd(Nim)2](CdIF-14),并对其进行了元素分析、红外光谱(FTIR)、热重分析(TGA)、X射线单晶衍射和粉末衍射(XRD)表征.与已经报道的咪唑镉配位聚合物[cadmium imidazolate framework(CdIF)]的三维结构相比,CdIF-14呈四连接二维平面结构,为典型的(4,4)网格和(4.4.4.4)拓扑构型:Cd2+位于四连接网格的顶点由4个去质子的2-硝基咪唑配体(分别以4个N原子配位和4个O原子弱相互作用形成相互倒置的N正四面体和O四面体)连接成正方形网格.虽然,ZIF的二维网格结构已有所报道,但是具有(4.4.4.4)拓扑的平面结构的ZIF尚未见报道,是金属咪唑配位聚合物结构中罕见的类型.

Cadmium（Ⅱ） 2‐nitroimidazolate（[Cd（Nim）2 ]n（CdIF‐14） is synthesized by reaction of 2‐ni‐troimidazol with cadmium nitrate under solvothermal condition and characterized by elemental analy‐sis ,FTIR ,TGA and Xray single crystal diffraction .Compared with the reported CdIFs ,CdIF‐14 demonstrates a two‐dimensional （2D） planar square‐network ,which Cd2＋ （located at the centre of two mutually inversed tetrahedrons of N4 and O4 ） cations are linked by the deprotonated HNim and w hich （4 .4 .4 .4）‐topology has not yet been seen in ZIFs .