A porous metal-organic framework based on an asymmetric angular diisophthalate for selective adsorption of C2H2 and
Jingjing Jiao1, Donghao Jiang1, Fengli Chen1
1College of Chemistry and Life Sciences, Zhejiang Normal University, Jinhua 321004, China. heyabing@zjnu.cn.
Abstract:
A new copper-based metal-organic framework [Cu2L(H2O)2]·5DMF·2H2O (ZJNU-56) has been solvothermally synthesized using a custom-designed asymmetric rigid bent diisophthalate ligand, 5,5'-(1-amine-naphthyl-2,4-diyl) diisophthalic acid (H4L), and structurally determined by single-crystal X-ray diffraction. ZJNU-56 features a three-dimensional (3D) open framework incorporating three different types of metal-organic cages and two distinct types of one-dimensional channels. With a moderate BET surface area of 1655 m2 g-1, optimized pore structure, and functional sites (open copper sites and Lewis basic amine groups) on the cage surface, ZJNU-56 after desolvation exhibits highly selectively adsorptive separation of C2H2 and CO2 over CH4 under ambient conditions. At 298 K, the predicted IAST selectivities are 35.7-72.9 for an equimolar C2H2/CH4 gas mixture and 6.8-7.0 for an equimolar CO2/CH4 gas mixture at pressures varying from 1 to 109 kPa, respectively, which are among the highest reported to date for copper-based MOFs.
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