Removal of carbon dioxide (CO₂) from a CO₂/N₂ mixture by utilizing CO₂-selective sorbents is important from the perspective of energy security and environmental sustainability. Herein, a microporous metal–organic framework (MOF) composed of manganese(II) and a bifunctional linker 5-(4H-1,2,4-triazol-4-yl)benzene-1,3-dicarboxylic acid (H₂L), [Mn(HL)₂] (1) is designed and synthesized using a hydrothermal method. Characterized by single-crystal X-ray diffraction (SCXRD), a microporous channel was found in the structure of compound 1 along the a-axis. Attributed to hydrogen-binding interactions between CO₂ molecules and N- and O-donor ligands in its microporous one-dimensional (1D) channel, compound 1 exhibits favorable adsorption of CO₂ over N₂. Further, verified by experimental breakthrough tests, the CO₂/N₂ mixture can be separated efficiently. This work provides potential guidance for designing CO₂-selective MOFs for CO₂/N₂ separation.

中文翻译：

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基于 5-(4H-1,2,4-三唑-4-基)间苯二甲酸的微孔 Mn(II) MOF 用于 CO2/N2 分离

从能源安全和环境可持续性的角度来看，利用CO _{2选择性吸附剂从CO 2} /N ₂混合物中去除二氧化碳(CO ₂ )是重要的。本文中，由锰(II)和双功能连接体5-(4 H -1,2,4-三唑-4-基)苯-1,3-二甲酸(H ₂ L)，[Mn(HL) ₂ ]( 1 )是采用水热法设计和合成的。通过单晶X射线衍射（SCXRD）表征，在化合物1的结构中沿着a轴发现了微孔通道。由于CO ₂分子与微孔一维(1D) 通道中的N-和O-供体配体之间的氢结合相互作用，化合物1表现出比N _{2更有利的CO 2}吸附。此外，通过突破性实验验证，CO ₂ /N ₂混合物可以有效分离。这项工作为设计用于CO ₂ /N _{2分离的CO 2}选择性MOF提供了潜在的指导。