Porous metal–organic frameworks (MOFs) constructed from organic linkers and metal ions/clusters can provide special pore environments for selective CO₂ capture. In this work, we designed and synthesized a highly porous acylamide-functionalized MOF (HNUST-7) from a nanosized linear diisophthalate ligand with linking acylamide groups and Cu(II)-paddlewheel clusters. Structural analysis shows that HNUST-7 possesses a (4,4)-connected NbO-type 3D open framework incorporating two different types of metal–organic cages. After activation, HNUST-7 displays a high BET surface area of 2804 m² g⁻¹ and large CO₂ uptakes of 26.1 and 19.4 mmol g⁻¹ under 30 bar at 273 and 298 K, respectively. In addition, with the optimized pores and functional sites (open copper sites and Lewis basic acylamide groups) integrated within the framework, HNUST-7 exhibits highly selective adsorption of CO₂ over CH₄ and N₂ under ambient conditions, which have been verified by both single compound gas sorption measurements and dynamic column breakthrough experiments.

中文翻译：

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高度多孔的酰胺修饰的MOF-505类似物，具有高选择性的CO ₂气体吸收能力†

由有机连接基和金属离子/簇构成的多孔金属有机框架（MOF）可以为选择性捕获CO ₂提供特殊的孔隙环境。在这项工作中，我们从具有连接酰基酰胺基团和Cu（II）-叶轮簇的纳米级线性二间苯二甲酸邻苯二甲酸酯配体设计并合成了高度多孔的酰基酰胺官能化MOF（HNUST-7）。结构分析表明，HNUST-7具有（4,4）连接的NbO型3D开放框架，其中包含两种不同类型的金属有机笼。活化后，HNUST-7的BET表面积高，为2804 m ² g ^-1，大的CO ₂吸收量为26.1和19.4 mmol g ^-1分别在273和298 K的30 bar下低于30 bar。此外，在框架内整合了优化的孔和功能位点（开放的铜位点和Lewis碱性酰胺基团）后，HNUST-7在环境条件下对CH ₄和N ₂表现出对CO _2的高度选择性吸附，这已通过以下方法验证：单一化合物气体吸附测量和动态色谱柱穿透实验。