Synthesis and Crystal Structure of a Magnesium Metal-organic Framework

A magnesium metal organic framework, [NH2(CH3)2][N(CH3)4][Mg5(bpdc)3(O2CH)6]· 3H2O (1, bpdcH2 = 4,4′-biphenyldicarboxylic acid), has been solvothermally synthesized and structurally characterized. 1 crystallizes in the trigonal system, space group R-3, with a = 11.3427(3), c = 41.5662(18) , V = 4631.3(3) 3, Z = 3 and the final R = 0.0457. Its structure features a pillared-layered three-dimensional network with 8.21  cavities, in which cationic [NH2(CH3)2]+ or [N(CH3)4]+ and lattice water molecules are located. Thermal stability of the title compound has also been investigated.     

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。