Boronic acid-functionalized porous polycarbazoles: preparation, adsorption performance, and heterogeneous catalysts for selective oxidation

摘要

Boronic acid-functionalized porous polycarbazoles (PCBA-1 and PCBA-2) which possess special functions as well as permanent porosity have been synthesized by oxidative coupling polymerization, followed by characterization of their chemical structure and porosities. The Brunauer-Emmett-Teller (BET) specific surface area value scope of PCBA-1 and PCBA-2 is from 868 to 768 m(2) g(-1) and the related dominant pore sizes are centered at about 1.0 nm. PCBA-1 and PCBA-2 exhibit potential adsorption for vapor solvent and small gas molecules. Their adsorption capacity for methanol measured at saturated vapor pressure and room temperature is 534 and 430 mg g(-1), respectively. They also show moderate uptake capacity (15.3 and 14.0 wt%) for CO2 at 1.0 bar and 273 K. Also, the obtained porous polymers as effective heterogeneous catalysts can promote transformation of 1,2-diols into alpha-hydroxy ketones accordingly by selective oxidation.