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Four isostructural metal-organic frameworks (MOFs) with various functionalized pore surfaces were synthesized from a series of diisophthalate ligands. These MOFs exhibit a new network topology of 4. 6 (4). 824 (2). 6 (4) 6 (4). 8 (2) 26 (6). Hydrogen uptake as high as 2. 67 wt % at 77 K/1 bar and CO2 uptake of 15. 4 wt % at 297 K/1 bar have been observed for PCN-308, which contains -CF3 groups. The isostructural series of MOFs also showed reasonable adsorption selectivity of CO2 over CH4 and N2.
Liu et al. (Wed,) studied this question.