Gas Storage in a Partially Fluorinated Highly Stable Three-Dimensional Porous Metal–Organic Framework

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