Rational design of imine?linked three?dimensional mesoporous covalent organic frameworks with bor topology

Three-dimensional (3D) covalent organic frameworks (COFs) possess great potential applications in various fields. Constructing 3D COFs with large pore sizes is extremely challenging due to the interpenetration and collapse. Herein, we report a series of crystalline imine-linked (3D-bor-COF-1, 3D-bor-COF-2, 3D-bor-COF-3) mesoporous channels through rationally designing topology configuration. These 3D-bor-COFs display permanent porosity Brunauer–Emmett–Teller (BET) surfaces 3205.5, 1752.7, 2077.3 m2 g?1 (SLangmuir = 4277.7, 2480.3, 2698.0 g?1), respectively. The were confirmed by lattice fringes from high-resolution transmission electron microscopy, as well structural simulation nitrogen adsorption isotherm analysis. (3.8 nm for 3D-bor-COF-3), which among highest record COFs. Owing unstacked-aromatic environment high specific surface area, excellent capacity benzene vapor (1203.9 mg under 298 K, three times higher than that best-reported 2D COF. This work not only provides inspiration imine-COFs, but also demonstrates strategy constructing aromatics materials.