A charge-separated diamondoid metal–organic framework

Abstract

We report the synthesis, characterization, and gas adsorption analyses of a new charge-separated metal–organic framework (MOF), UNM-1 (C₅₂H₁₆BCuF₁₆N₄), possessing diamondoid structures, assembled from an anionic tetrahedral borate ligand and cationic Cu(I) metal ion. The resulting MOF structure displays four-fold interpenetration, resulting in high environmental stability, and at the same time possesses relatively large surface area (SA_BET = 621 m² g⁻¹) due to the absence of free ions. Gas adsorption measurements revealed temperature-dependent CO₂ adsorption/desorption hysteresis and large CO₂/N₂ ideal selectivities up to ca. 99 at 313 K and 1 bar, suggesting potential applications of this type of charge-separated MOFs in flue gas treatment and CO₂ sequestration.