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We reported an example of metal–organic framework (MOF) -based porous liquid by dispersing ZIF-8 (Zn (mim) 2, mim = 2-methylimidazole) nanocrystallites in ionic liquid (IL) of BpyNTf2 (N-butyl pyridinium bis (trifluoromethyl sulfonyl) imide). Two essential challenges, stable colloid formation and porosity retention, have been overcome to prepare MOF-based porous liquid. Preventing ZIF-8 nanocrystals from aggregation before dispersing is vital to form a stable ZIF-8 colloid in IL via enhancing the interaction between ZIF-8 and IL. The resultant ZIF-8–BpyNTf2 colloid is able to be stable over months without precipitating. BpyNTf2 with larger ion sizes cannot occupy pores in ZIF-8, leaving the ZIF-8 cage empty for enabling access by guest molecules. The porosity of this porous liquid system was verified by positron (e+) annihilation lifetime spectroscopy and I2 adsorption in ZIF-8 in the colloid. MOF-based porous liquids could provide a new material platform for liquid-bed-based gas separations.
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