Conjugated Microporous Polymers with Extended π-Structures for Organic Vapor Adsorption

Abstract

Conjugated microporous polymers (CMPs), which are organic porous materials with π-conjugated skeletons, have attracted considerable attention in recent years owing to their distinct properties. Here, two sp2 carbon CMPs with analogous structures, namely, BO-CMP-1 and BO-CMP-2, were prepared through palladium-catalyzed Suzuki–Miyaura cross-coupling reaction. BO-CMP-1 and BO-CMP-2 possess high surface areas and can be further modulated by postoxidation reaction to form networks with enhanced rigidity, as denoted by oBO-CMP-1 and oBO-CMP-2, respectively. The oxidation process transforms biolefin benzoquinone blocks within the skeletons into tetrabenzocoronene segments and endows the resultant oBO-CMPs with extended π-structures. The postoxidation provides a feasible approach to obtain CMPs with large π-systems. This approach prevents the disadvantages of direct synthesis by using monomers with extended π-structures, which often suffers low polymerization degree from strong π–π stacking of the monomers. The N...