Abstract
A new three-dimensional cationic metal–organic framework Zn8O(EDDA)4(ad)4·(HEDDA)2·6DMF·27H2O (ZJU-48; H2EDDA = (E)-4,4′-(ethene-1,2-diyl)dibenzoic acid; ad = adenine) was solvothermally synthesized and structurally characterized. ZJU-48 features a three-dimensional structure with a cationic skeleton and has one-dimensional pores along the c axis of about 9.1 × 9.1 A2. The activated ZJU-48a exhibits a BET surface area of 1450 m2 g−1. The structural features of the charged skeleton of ZJU-48a have enabled its stronger charge-induced interaction with C2 hydrocarbons than with C1 methane, resulting in highly selective gas sorption of C2 hydrocarbons over CH4 with the adsorption selectivity over 6 at 298 K. The separation feasibility has been further established by the simulated breakthrough and pulse chromatographic experiments, thus methane can be readily separated from their quaternary mixtures at room temperature.
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