Abstract
Increasing the ligand size could enlarge the pore volume of MOFs, which could further increase the gas adsorption capacity. Inspired by this, we synthesized a porous 3D metalorganic framework [Cu2(L1)·(H2O)2] ·2H2O·3DMF·(CH3)2NH2] (NEM-5) with a high density of carboxylate groups and CuII sites, which exhibited large uptakes for C2H2 (65 cm3 g-1), C2H4 (48 cm3 g-1), C2H6 (64.7 cm3 g-1), C3H6 (68 cm3 g-1), and C3H8 (63.4 cm3 g-1) at room temperature. Compared with MOF 1, NEM-5 has a similar topology and larger pore volume, but the gas adsorption capacities are significantly reduced, which might be attributed to the large pore size and low framework density of NEM-5.
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