Constructing metalated three-dimensional (3D) covalent organic frameworks is a challenging synthetic task. Herein, we report the synthesis and characterization of a highly porous (SA = 5083 m g) 3D COF with a record low density (0.13 g cm) containing π-electron conjugated dehydrobenzoannulene (DBA) units. Metalation of DBA-3D-COF 1 with Ni to produce Ni-DBA-3D-COF results in a minimal reduction in the surface area (SA = 4763 m g) of the material due to the incorporation of the metal within the cavity of the DBA units, and retention of crystallinity. Both 3D DBA-COFs also display great uptake capacities for ethane and ethylene gas.

Developing novel synthetic strategies to construct crystalline polymeric materials with excellent chemical stability and high carbon capture capacity has become a challenging process. Herein, we report the synthesis of two novel 2D benzobisoxazole-linked covalent organic frameworks (BBO−COFs) utilizing C 3 -symmetric formyl-and C 2symmetric o-aminophenol-substituted molecular building blocks. The BBO−COFs exhibit excellent water stability, high surface areas, and great CO 2 uptake capacities. This general synthetic method affords the opportunity to prepare ordered BBO-based polymeric materials for carbon capture, chemical sensing, and organic electronic applications.

A mechanistic investigation detailing the role of nucleophilic catalysts during the formation of benzobisoxazole (BBO)-linked COFs.

A ruthenium-based porous organic polymer is constructed and used to reduce CO2 to potassium formate.