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迄今为止,还未有报道过由金属有机框架材料(MOFs)转化成共价有机笼(COF-Cages)的文章.通过交联环糊精MOF骨架中的羟基,并除去其中的钾离子,构建了由环糊精MOF转化形成的结晶性多孔有机笼.首先合成CD-MOF,再将CD-MOF中的羟基交联,得到Cross-linkedγ-环糊精MOF(CL-CD-MOF),最后除去钾离子得到Z-cage,并且应用热重分析(TGA)、红外光谱(IR)、固体核磁共振(CP/MAS/NMR)光谱等多种分析手段对其结构进行表征.结果表明,该方法得到的有机笼(Z-cage)具有特定的方钠石型晶体结构,并且比表面积达862 m2·g-1.作为对照实验,在水热条件下,将γ-CD和对苯二硼酸按照1∶4化学计量比合成的CL-polymer与Z-cage具有不同的晶体结构,并通过X-射线粉末衍射(PXRD)进行了证明,反映了MOF模板合成法在控制材料的晶体结构的优越性.这种从结晶性无机-有机杂化MOF到结晶性有机笼Z-cage的转变,提供了多孔晶体材料之间晶体到晶体转变的途径.
To date, no article has been reported on the conversion of metal organic framework materials (MOFs) into covalent organic cages (COF-Cages). By cross-linking hydroxyl groups in the cyclodextrin MOF framework and removing the potassium ions therein, The cyclodextrin was converted into a crystalline porous organic cage by first synthesizing a CD-MOF and then crosslinking the hydroxyl group in the CD-MOF to obtain a cross-linked γ-cyclodextrin MOF (CL-CD-MOF) Z-cage was obtained by removing potassium ions, and its structure was characterized by TGA, IR and CP / MAS / NMR spectroscopy.The results showed that this method The obtained Z-cage has a special sodalite crystal structure and has a specific surface area of 862 m2 · g-1. As a control experiment, γ-CD and terephthalic acid were mixed under hydrothermal conditions in accordance with The 1: 4 stoichiometry-synthesized CL-polymer has a different crystal structure from the Z-cage and is characterized by X-ray powder diffraction (PXRD), reflecting the superiority of the MOF template synthesis in controlling the crystal structure of the material .This transition from a crystalline inorganic-organic hybrid MOF to a crystalline organic cage Z-cage provides a porous crystalline material Way between the crystal transition to crystal.