Targeted synthesis of a porous borazine-linked covalent organic framework

The first microcrystalline borazine-linked polymer, BLP-2(H), has been synthesized. BLP-2(H) crystallizes into 2D sheets that stack in an eclipsed AA fashion, has high thermal stability (∼420 °C) and high porosity (SABET = 1178 m2 g−1) and it can store up to 2.4 wt% of hydrogen at 77 K and 15 bar with isosteric heat of adsorption of 6.8 kJ mol−1.