Targeted control over the porosities and functionalities of conjugated microporous polycarbazole networks for CO2-selective capture and H2 storage

We report a conjugated microporous polycarbazole network and its pyridine-, bipyridine-, and cyanofunctionalized networks exhibiting large surface area (1126 m(2) g(-1)), isosteric heat of CO2 adsorption (similar to 32 kJ mol(-1)), and CO2-uptake capacity (14 wt% at 1 bar and 273 K). IAST calculations using singlecomponent- isotherms reveal that the functionalized polycarbazole networks have a very high CO2 selectivity over N-2 (164) under ambient conditions. These porous networks also possess moderate H-2 storage capacity (1.35 wt% at 1 bar and 77 K) and high isosteric heat of H-2 adsorption (10.3 kJ mol(-1)). Our finding provides a new targeted route to control the porosities and functionalities of microporous polymers for efficient gas uptake.