Zou Yu-Huang, Huang Yuan-Biao, Si Duan-Hui, Yin Qi, Wu Qiu-Jin, Weng Zixiang, Cao Rong
State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fujian, Fuzhou, 350002, P. R. China.
Department of Chemistry, School of Chemistry and Materials Science, University of Science and Technology of China, Anhui, Hefei, 230000, P. R. China.
Angew Chem Int Ed Engl. 2021 Sep 13;60(38):20915-20920. doi: 10.1002/anie.202107156. Epub 2021 Aug 11.
The unique applications of porous metal-organic framework (MOF) liquids with permanent porosity and fluidity have attracted significant attention. However, fabrication of porous MOF liquids remains challenging because of the easy intermolecular self-filling of the cavity or the rapid settlement of porous hosts in hindered solvents that cannot enter their pores. Herein, we report a facile strategy for the fabrication of a MOF liquid (Im-UiO-PL) by surface ionization of an imidazolium-functionalized framework with a sterically hindered poly(ethylene glycol) sulfonate (PEGS) canopy. The Im-UiO-PL obtained in this way has a CO adsorption approximately 14 times larger than that of pure PEGS. Distinct from a porous MOF solid counterpart, the stored CO in Im-UiO-PL can be slowly released and efficiently utilized to synthesize cyclic carbonates in the atmosphere. This is the first example of the use of a porous MOF liquid as a CO storage material for catalysis. It offers a new method for the fabrication of unique porous liquid MOFs with functional behaviors in various fields of gas adsorption and catalysis.
具有永久孔隙率和流动性的多孔金属有机框架（MOF）液体的独特应用引起了广泛关注。然而，由于空腔的分子间易于自填充，或者多孔主体在无法进入其孔隙的受阻溶剂中快速沉降，多孔MOF液体的制备仍然具有挑战性。在此，我们报道了一种通过用空间位阻聚（乙二醇）磺酸盐（PEGS）冠层对咪唑功能化框架进行表面离子化来制备MOF液体（Im-UiO-PL）的简便策略。以这种方式获得的Im-UiO-PL对CO的吸附量约为纯PEGS的14倍。与多孔MOF固体对应物不同，Im-UiO-PL中储存的CO可以缓慢释放，并有效地用于在大气中合成环状碳酸酯。这是将多孔MOF液体用作催化CO储存材料的首个实例。它为制备在气体吸附和催化等各个领域具有功能行为的独特多孔液体MOF提供了一种新方法。
