金属离子导向合成两个金属配位聚合物：晶体结构和荧光性质(英文)

Metal Ions Controlled Assembly of Two Coordination Polymers:Structures and Luminescence Properties

以2,5-呋喃二羧酸和六水硝酸锌/四水硝酸镉为原料,在溶剂热条件下,合成出2个金属有机配位聚合物,[Zn(FDC)(DMF)2]n(1)和{(Me2NH2)2[Cd2(FDC)3(H_2O)2]·4H_2O}n(2)(H2FDC=2,5-呋喃二甲酸,DMF=N,N-二甲基甲酰胺)。通过元素分析、红外光谱、差热分析、X射线粉末衍射和X射线单晶衍射等手段对配合物进行了结构表征。结果显示,化合物1为一维链结构,通过分子间氢键作用构筑成二维结构;而2为二维(4,4)网络结构。热稳定性表明化合物1脱去DMF配体后稳定到300℃;而2脱去配体水、阴离子和溶剂分子后结构立即发生坍塌。常温固态下,激发波长分别为303和350 nm时考察了配合物1和2的荧光性质,结果显示2个化合物均发射蓝色荧光(λmax=406,470 nm),荧光寿命分别为76.2和138.1 ns。

Two zinc/cadmium-based coordination polymers （CPs）, [Zn（FDC）（DMF）2],, （1） and {（Me2NH2）2[Cd2（FDC）3 （H：O）2]·4H20}n（2） （H2FDC=2,5-furandicarboxylic acid, DMF=N,N-dimethyl formamide） have been prepared based on 2,5-furandicarboxylate under the same reaction conditions （130 ℃ and DMF） and were structurally characterized by elemental analysis, IR, TGA, powder X-ray diffraction and single-crystal X-ray diffraction. Complex 1 performs a 1D chain structure, where the chains are further connected into 2D layer structure by hydrogen bonds, whereas 2 shows 2D （4,4） network and is unstable in air. The results of thermal analysis indicate that 1 is stable up to 300℃ after the DMF molecules are removed, but 2 is unstable after the aqua ligands, cations and solvent molecules are removed. Moreover, the luminescent properties of 1 and 2 were detected at room temperature under the excitations of 303 nm and 350 nm, respectively. Both of 1 and 2 emit the intensely blue characteristic luminescence at room temperature （λmax=406 and 470 nm）, with lifetimes of up to 76.2 and 138.1 ns, respectively.