Removal of carbon dioxide (CO) from a CO/N mixture by utilizing CO-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-(4-1,2,4-triazol-4-yl)benzene-1,3-dicarboxylic acid (HL), [Mn(HL)] () 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 along the -axis. Attributed to hydrogen-binding interactions between CO molecules and N- and O-donor ligands in its microporous one-dimensional (1D) channel, compound exhibits favorable adsorption of CO over N. Further, verified by experimental breakthrough tests, the CO/N mixture can be separated efficiently. This work provides potential guidance for designing CO-selective MOFs for CO/N separation.
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