Expanding MOF with Unexpanded Channel via Ketone Decorated Ligand for Ethylene Purification and Stability Enhancement.

The concept of an expanding MOF with unexpanded channel size was realized in MOF NTUniv-61 by the utilization of a ketone-functional-group-decorated semirigid ligand and pillar-layer platform. After this unusual expansion, the preferential C 2 H 6 adsorption was preserved via the unchanged pore size, and the functional group was inserted into the MOF. Interestingly, the C 2 H 2 uptake ability, C 2 H 4 selective adsorption ability, and structural stability were obviously enhanced due to the incorporation of the ketone functional group, which were further verified by isosteric heats of adsorption ( Q st ), GCMC modeling, and breakthrough experiments.