一例对二硫化碳具有荧光传感性能的Mg-金属有机框架化合物

通过溶剂热合成了一例Mg-MOF化合物Mg₄(1,4-NDC)₄(DMA)₂(CH₃OH)₂(H₂O)₂]·DMA·CH₃OH(1,1,4-H₂NDC=1,4-萘二酸,DMA=N,N'-二甲基乙酰胺),并对其结构表征及荧光性能进行了研究。 单晶X射线研究结果表明,化合物结晶于P2₁/c空间群,其晶体学数据为a=2.06090(12) nm, b=2.21014(13) nm, c=1.50385(10) nm, β=111.399(3)°, V=6.3776(7) nm³, Z=4, D_c=1.403 g/cm³, F(000)=2824, R=0.0596, wR=0.1225(I>2σ(I))。 化合物1中,二核的镁作为次级构筑单元通过桥连配体1,4-NDC连接形成沿c轴方向拓展的一维链。 一维链间进一步通过配体连接形成3D框架的化合物。 荧光性能研究表明,化合物1对CS₂具有灵敏的荧光传感性能,在0.4%的体积分数条件下可引起CS₂荧光的完全淬灭。 此外,化合物1的热稳定性也通过热重分析进行了研究,发现其可稳定到140 ℃左右。

A Fluorescent Magnesium-Based Metal-Organic Framework with a Sensitive Sensing Property for Carbon Disulfide

Presented here are the solvothermal synthesis, structural characterization and fluorescent properties of a magnesium metal-organic framework(Mg-MOF), namely Mg₄(1,4-NDC)₄(DMA)₂(CH₃OH)₂(H₂O)₂]·DMA·CH₃OH(1, 1,4-H₂NDC=1,4-naphthalene dicarboxylic acid, DMA=N,N'-Dimethylacetamide). Single-crystal X-ray diffraction studies revealed that compound 1 crystallized in the monoclinic space group P2₁/c(No.14) with a=2.06090(12) nm, b=2.21014(13) nm, c=1.50385(10) nm, β=111.399(3)°, V=6.3776(7) nm³, Z=4, D_c=1.403 g/cm³, F(000)=2824, R=0.0596 and wR=0.1225(I>2σ(I)). The structure of compound 1 features a three-dimensional(3D) network constructed from the 1,4-NDC ligands as bridging linkers and binuclear magnesium clusters as the secondary building units, with cages occupied by different solvent molecules of DMA and CH₃OH. Notably, fluorescence studies revealed that compound 1 demonstrated sensitive sensing towards carbon disulfide(CS₂); remarkably, the fluorescence intensity of compound 1 could be almost completely quenched at the low concentration of 0.4%(volume fraction) of CS₂. Thermal stability was investigated by thermogravimetric analysis which indicated that compound 1 could be stable up to 140 ℃.