Gas Storage\nin a Partially Fluorinated Highly Stable\nThree-Dimensional Porous Metal–Organic Framework

Abstract

A partially\nfluorinated linear rigid linker, 2,2′-bis-trifluoromethyl-biphenyl-4,4′-dicarboxylic\nacid (H₂bfbpdc), has been synthesized. This linker forms\na porous three-dimensional (3D) metal–organic framework, {[Zn₄O­(bfbpdc)₃(bpy)_0.5(H₂O)]·(3DMF)­(H₂O)}_<i>n</i> (<b>1</b>), in the\npresence of the colinker 4,4′-bipyridine (bpy) and Zn­(NO₃)₂·6H₂O under solvothermal condition.\nSingle crystal X-ray analysis shows that <b>1</b> contains a\n3D channel structure with highly polar pore surfaces decorated with\npendant trifluoromethyl groups of bfbpdc^2– linker.\nThermogravimetric analysis (TGA) and variable temperature powder X-ray\ndiffraction (VTPXRD) exhibit high thermal stability of the framework.\nThe solvent molecules present in the voids can be removed by heating,\nmaintaining the integrity of the structure to afford a porous framework.\nGas (N₂, H₂, CH₄, and CO₂) and water adsorption studies were performed on this framework.