Microporous Poly(Schiff Base) Constructed from Tetraphenyladamantane Units for Adsorption of Gases and Organic Vapors

A new microporous poly(Schiff base) ( PSN‐3 ) is constructed from 1,3,5,7‐tetrakis(4‐formylphenyl)adamantane and 1,3,5,7‐tetrakis(4‐aminophenyl)adamantane through an A₄‐A₄′ reaction. The surface and internal morphologies of porous PSN‐3 are examined by FE‐SEM and HR‐TEM. PSN‐3 exhibits a BET surface area of 865 m² g^?1 with a major pore size around 0.6 nm. Moreover, PSN‐3 can uptake 1.32 wt% H₂ (77 K/1 bar), 13.6 wt% CO₂ (273 K/1 bar), 80.5 wt% benzene, and 63.7 wt% cyclohexane (298 K/0.9 bar). The adsorption selectivities for CO₂/N₂, CO₂/CH₄, benzene/N₂, and benzene/H₂O are 88, 16, 267, and 19, respectively. The high adsorption capacities and selectivities for gases and vapors make PSN‐3 a promising candidate for H₂ storage, CO₂ capture, and recovery of organic pollutants.