Fluorinated Porous Poly(spirobifluorene) Via Direct C‒H Arylation: Characterization, Porosity, and Gas Uptake.

Considering intrinsic properties of conjugated polyfluorenes and special functions of porous polymers, synthesis of fluorinated porous poly(spirobifluorene) via direct C−H arylation polycondensation is explored. Owing to the contorted structure and cross-linking nature, the obtained polymerFPSBFshows permanent porosities with Brunauer–Emmett–Teller specific surface area up to 700 m2g−1and exhibits a narrow pore size distribution with the dominant pore size at about 0.63 nm, which is more suitable for adsorption of small gas molecules. Based on the measured gas physisorption isotherms with pressure up to 1.13 bar, the obtained polymer shows good uptaking capacities for hydrogen (1.30 wt% at 1.0 bar and 77 K) and methane (4.80 wt% 1.0 bar and 273 K). Moreover,FPSBFhas significant adsorption selectivity for CH4against N2and the estimated ideal adsorption selectivity ratio is up to 30/1 at 1.0 bar and 273 K, which makes the material possess potential application in gas separation. [ABSTRACT FROM AUTHOR]