A Robust Metal-Organic Framework Combining Open Metal Sites and Polar Groups for Methane Purification and CO2/Fluorocarbon Capture

A 3D porous perchlorinated metal-organic framework (MOF), LIFM-26, featuring dual functionality, that is, functional polar groups and open metal sites, has been synthesized using perchlorinated linear dicarboxylate to link trigonal prismatic Fe-3(mu(3)-O) units. LIFM-26 exhibits good thermal and chemical stability, and possesses high porosity with a BET surface area of 1513 m(2)g(-1), compared with isoreticular MOF-235 and Fe3O(F4BDC)(3)(H2O)(3) (F4BDC= 2,3,5,6-tetrafluorobenzene-1,4-dicarboxylate). Most strikingly, LIFM-26 features good gas sorption/separation performance at 298 K and 1 atm with IAST selectivity values reaching up to 36, 93, 23, 11, 46, and 202 for CO2/CH4, CO2/N-2, C2H4/CH4, C2H6/CH4, C3H8/CH4, and R22/N-2 (R22= CHClF2), respectively, showing potential for use in biogas/natural gas purification and CO2/R22 capture.