Construction of a Multi-Cage-Based MOF with a Unique Network for Efficient CO2 Capture
Construction of a Multi-Cage-Based MOF with a Unique Network for Efficient CO2 Capture
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构建具有独特网络的多笼式 MOF，以实现高效 CO2 捕获
DOI：
10.1021/acsami.7b06491
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发表时间：
2017-08-09
影响因子：
9.5
通讯作者：
Bu, Xian-He
中科院分区：
文献类型：
--
作者：
Yu, Mei-Hui;Zhang, Ping;Bu, Xian-He
作为一种MOFs，笼基MOFs通常带有大的空隙和小的窗口，这有利于保持动力学捕获在笼内的小分子的存储（限制效应）。通过网状合成调节窗口大小，笼型MOFs可以选择性地捕获和分离合适大小的分子。在这里，考虑角定向和面定向策略，一个新的多年龄为基础的MOF NUM-3与一个新的（3，4，5）-连接的拓扑结构被成功地构建在混合配体组装。在NUM-3框架中，存在四种不同类型的笼，它们表现出不同的多面体构型。以ABCDDCBA为最小重复单位的四种笼形结构沿c轴沿着形成一维曲折通道。利用NUM-3a（活化NUM-3）一维孔道具有不同内径（4.0 ~ 13.0埃）的结构特点，NUM-3a可以通过尺寸选择性（经验动力学直径：CO2 <C2 H4 <C2 H6）捕获CO2。此外，它对CO2的选择性优于对N-2和CH 4的选择性。
As a kind of MOFs, cage-based MOFs usually carry large voids and small windows, which are advantageous to the storage of small molecules that remain kinetically trapped inside the cages (confinement effect). By adjusting the size of windows via reticular synthesis, the cage-based MOFs can selectively capture and separate the suitable size molecules. Here, considering angle directed and face-directed strategies, a novel multicage-based MOF NUM-3 with a new (3,4,5)-connected topology was successfully constructed in the mixed-ligands assembly. In the framework of NUM-3, there exist four different kinds of cages, which exhibit diverse polyhedral configurations. The four kinds of cages in the order ABCDDCBA as the minimum repeat unit form a 1D tortuous channel along the c axis. Based on the structure characteristics that the 1D channel exhibits different inner diameter (from 4.0 to13.0 angstrom), NUM-3a (actived NUM-3) can capture CO2 over C2H4 and C2H6 by the size selectivity (the empirical kinetic diameters: CO2 < C2H4 < C2H6). In addition, it also exhibits commendable selectivity for CO2 over N-2 and CH4.