溶剂导向合成两个氢键型金属有机框架  

Solvent-Directed Syntheses of Two Hydrogen-Bonded Metal-Organic Frameworks

作　　者：王飞[1] WANG Fei(Fujian Institute of Research on the Structure of Matter,Chinese Academy of Sciences,Fuzhou,Fujian 350002,China)

机构地区：[1]中国科学院福建物质结构研究所,福建福州350002

出　　处：《聊城大学学报（自然科学版）》2024年第5期102-110,共9页Journal of Liaocheng University:Natural Science Edition

基　　金：福建省自然科学基金项目(2022J01505)资助。

摘　　要：利用溶剂作为结构导向剂,以相同的反应物在不同溶剂中合成两个氢键型金属有机框架(MOFs),分子式分别为Cd(obb)(en)[NH(CH_(3))_(2)]·DMF(1)和Cd(obb)_(2)(en)_(2)·DMA(2)(H_(2)obb=4,4′-二苯醚二甲酸,en=乙二胺,DMF=N,N′-二甲基甲酰胺,DMA=N,N′-二甲基乙酰胺)。单晶X射线结构分析显示,化合物1和化合物2具有一个共同的结构特征:金属原子和obb^(2-)配体形成一维链,该一维链通过氢键连接形成二维层。然而,这两个MOFs之间存在明显的差异。化合物1中包含结构有序的DMF客体分子,并通过强的主-客体氢键相互作用将其固定在层间。化合物2中,二维层通过层间相互作用相互连接形成三维框架,由于缺少强相互作用,无序的DMA客体分子填在其中,无法通过单晶数据确定。这两种化合物表现出优异的溶剂稳定性。值得注意的是,化合物2具有永久的孔隙性和吸附气体的能力,在一个大气压下,化合物2对氮气的最大吸附量约为38 mL/g,使其成为潜在的气体储存/分离候选材料。Presented here are the solvent-directed syntheses of two hydrogen-bonded metal-organic frameworks(MOFs),namely,Cd(obb)(en)[NH(CH_(3))_(2)]·DMF(1)and Cd(obb)_(2)(en)_(2)·DMA(2)(H_(2)obb=4,4′-Oxybisbenzoic acid,en=ethanediamine,DMF=Dimethyl Formamide,DMA=Dimethylacetamide),which are solvothermally synthesized from same reactants but different solvents.Single crystal X-ray analysis shows that compounds 1 and 2 contain same 1D Cd-obb chain and 2D Hydrogen-bond network.Differently,compound 1 encapsulates the structural ordered DMF guest between layers via strong host-guest H-bond interaction,whereas in compound 2,the 2D layers link to each other via interlayer interactions to generate a 3D framework containing disordered DMA guest molecules.Both compounds exhibit good stability in various solvents.It is worth noting that compound 2 exhibits permanent porosity and gas adsorption capability.Under 1 atmosphere pressure,compound 2 has a maximum nitrogen adsorption capacity of approximately 38 mL/g,making it a potential candidate material for gas storage/separation applications.

关 键 词：金属有机框架 晶体结构 氢键 结构导向剂 稳定性 

分 类 号：O641.4[理学—物理化学]