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)}n (1), 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 1 contains a
3D channel structure with highly polar pore surfaces decorated with
pendant trifluoromethyl groups of bfbpdc2– 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.