基于半刚性三角形羧酸配体构筑的配位聚合物的合成,结构及其荧光性质

Syntheses, Crystal Structures and Properties of Coordination Polymers Built from a Semi-rigid Tripod Carboxylic Acid

通过使用一个半刚性的多齿羧酸配体3,3′,3″-(((2,4,6-trimethylbenzene-1,3,5-triyl)tris(methylene))tris(oxy))tribenzoic acid(H3L),在溶剂热条件下合成了4个配位聚合物{[Cd3(L)2(H2O)2]·5DMF·6H2O}n(1),{[Co3(L)2(H2O)2]·2DMF·6H2O}n(2),{[Mn3(L)2(H2O)2]·3DMF·6H2O}n(3),{[Zn3(L)2(H2O)2]·5DMA·5H2O}n(4),并通过X射线单晶衍射,热重分析对配合物结构进行了表征。4个化合物都是同构的,由沙漏型的M3簇和L3-配体作为次级结构单元,从而给出了一个金属-有机纳米笼的三维结构,从拓扑学的观点看,4个配合物的结构可以看作是三节点的(3,3,6)-连接的网络。荧光光谱测试表明配合物1和4在激发波长为272 nm下,在385 nm处显示了强的宽发射峰。荧光传感测试结果表明,配合物1是一种潜在的硝基苯类化合物的传感材料。

By using a semi-rigid muhidentate carboxylate linker3,3′,3″-（（（2,4,6-trimethylbenzene-1,3,5-triyl）tris （methylene））tris（oxy））tribenzoie acid （H3L）, four coordination polymers, namely, {[Cd3（L）2（H2O）2]·5DMF·6H2O}n（1）,{[Co3（L）2（H2O）2]·2DMF·6H2O}n（2）,{[Mn3（L）2（H2O）2]·3DMF·6H2O}n（3）,{[Zn3（L）2（H2O）2]·5DMA·5H2O}n（4） were obtained and characterized by single crystal X-ray diffraction, thermogravimetric, elemental analysis, thermal analyses, IR spectra and fluorescence. Four compounds are isostructural with hourglass M3 clusters and L3- ligands as secondary building units （SBUs） to form a pumpkin-shaped metalorganic nanocage, and possess a three-connected node （3,3,6）-connected 3D network. Compounds 1 and 4 exhibited strong photoluminescent emissions at room temperature with a peak at 385 nm, owing to a ligand-centered excited state. The emission intensities of the compound 1 varied upon contact with different solvents or analytes, exhibiting selective emission quenching responses towards nitroaromatics. CCDC： 1041419. 1：1041420 2; 1041421, 3; 1041422, 4.