Polar Ketone-Functionalized Metal–Organic Framework\nShowing a High CO₂ Adsorption Performance

Abstract

The\nincorporation of various functionalities into porous metal–organic\nframeworks (MOFs) represents an efficacious strategy to improving\ntheir gas adsorption properties. In this work, a carbonylated tetracarboxylic\nacid ligand (5,5′-carbonyldiisophthalic acid) was synthesized,\nand a ketone-functionalized MOF with exposed metal sites based on\nthis ligand was formed successfully. Structural analysis reveals that\nthe new MOF possesses channels decorated by the carbonyl groups and\nrhombicuboctahedral cages, with open Cu^II sites pointing\ntoward the cage center. The framework exhibits exceptionally high\nCO₂ (46.7 wt % at 273 K and 1 bar) and H₂ (2.8\nwt % at 77 K and 1 bar) uptake. Furthermore, it displays high selectivities\nof CO₂ adsorption over N₂ and CH₄ at 298 K.