Highly Selective CO2 Capture by a Flexible Microporous Metal–Organic Framework (MMOF) Material
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Caught in a CO2 trap: A highly flexible microporous metal–organic framework material exhibits a remarkable ability to capture and separate carbon dioxide from other small gases, such as N2, H2, CH4, CO, and O2, with separation ratios of 294, 190, 257, and 441 for CO2/N2, CO2/H2, CO2/CH4, and CO2/CO, respectively, at 0.16 atm and 25 °C, and 768 for CO2/O2 at 0.2 atm and 25 °C.A series of ultra-microporous MOF-5-like metal-squarate frameworks exhibit moderate C 2 H 2 uptake capacity, in addition to excellent C 2 H 2 /CO 2 and C 2 H 2 /C 2 H 4 separation ability regulated by strong hydrogen bond interactions.
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Saturation H2 uptake in a series of microporous metal−organic frameworks (MOFs) has been measured at 77 K. Saturation pressures vary between 25 and 80 bar across the series, with MOF-177 showing the highest uptake on a gravimetric basis (7.5 wt %) and IRMOF-20 showing the highest uptake on a volumetric basis at 34 g/L. These results demonstrate that maximum H2 storage capacity in MOFs correlates well to surface area, and that feasible volumetric uptakes can be realized even in highly porous materials.
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Abstract Microporous metal-organic frameworks (MOFs) based on lanthanide metal ions or clusters represent a group of porous materials, featuring interesting coordination, electronic, and optical properties. These attractive properties in combination with the porosity make microporous lanthanide MOFs (Ln-MOFs) hold the promise for various applications. This review is to provide an overview of the current status of the research in microporous Ln-MOFs, and highlight their potential as types of multifunctional materials for applications in gas/solvent adsorption and separation, luminescence and chemical sensing and catalysis.
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Abstract Hierarchically porous metal–organic frameworks (HP‐MOFs) have attracted great attention owing to their advantages over microporous MOFs in some applications. Despite many attempts, the development of a facile approach to generate HP‐MOFs remains a challenge. Herein we develop a new strategy, namely the modulation of cation valence, to create hierarchical porosity in MOFs. Some of the Cu II metal nodes in MOFs can be transformed into Cu I via reducing vapor treatment (RVT), which partially changes the coordination mode and thus breaks coordination bonds, resulting in the formation of HP‐MOF based on the original microporous MOF. Both the experimental results and the first‐principles calculation show that it is easy to tailor the amount of Cu I and subsequent hierarchical porosity by tuning the RVT duration. It is found that the resultant HP‐MOFs perform much better in the capture of aromatic sulfides than the original microporous MOF.
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Abstract Hierarchically porous metal–organic frameworks (HP‐MOFs) have attracted great attention owing to their advantages over microporous MOFs in some applications. Despite many attempts, the development of a facile approach to generate HP‐MOFs remains a challenge. Herein we develop a new strategy, namely the modulation of cation valence, to create hierarchical porosity in MOFs. Some of the Cu II metal nodes in MOFs can be transformed into Cu I via reducing vapor treatment (RVT), which partially changes the coordination mode and thus breaks coordination bonds, resulting in the formation of HP‐MOF based on the original microporous MOF. Both the experimental results and the first‐principles calculation show that it is easy to tailor the amount of Cu I and subsequent hierarchical porosity by tuning the RVT duration. It is found that the resultant HP‐MOFs perform much better in the capture of aromatic sulfides than the original microporous MOF.
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A series of microporous metal–organic frameworks (MOFs) constructed by using a V-shaped linker, 4,4′-sulfonyldibenzoic acid, were evaluated for their Xe gas adsorption properties.
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Two isostructural 2D → 2D parallel → 3D inclined interpenetrating polycatenane-like metal–organic frameworks were successfully constructed based on length-adjusted tricarboxylate ligands. With the merit of being microporous, IFMC-10 can serve as host for encapsulating lanthanide cations and I2 to exhibit luminescent sensing and rapid adsorption of iodine.
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A new microporous metal–organic framework (MOF) material [Ni4(dpa)4(pyz)4(H2O)8]·11H2O (1) with BCT zeolite topology has been hydrothermally synthesized. The framework components undergo dynamic structural transformation in response to removal and rebinding of the suitable guest molecules.
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