A Naphthalene-Based Three-Dimensional Covalent Organic Framework with acs Topology for Highly Selective Sulfur Hexafluoride Capture

Three-dimensional covalent organic frameworks (3D COFs) have emerged as a promising yet underexplored class of porous materials for the selective adsorption of sulfur hexafluoride (SF6). Herein, we report a microporous 3D COF (3D-TMTAPB-NDA-COF) constructed from a 6-connected polyhedral node and a naphthalene-based linear linker. Structural analysis confirms that 3D-TMTAPB-NDA-COF adopts an acs topology with Class IIIa interpenetration. Notably, the COF exhibits a high SF6 uptake of 39.5 cm3 g–1 at 298 K and an exceptional SF6/N2 (10/90) selectivity of 359 at 1 bar, representing the highest value reported among purely organic porous materials. This work not only introduces a high-performance candidate for selective SF6 capture but also provides valuable insights into the rational design of functional 3D COFs for advanced gas adsorption and separation applications.