Highly selective carbon dioxide uptake by a microporous kgm-pillared metal–organic framework with acylamide groups

Abstract

A microporous acylamide-functionalized metal–organic framework with a kgm-pillared structure, [Cu(NAIP²⁻)]_n, has been designed by self-assembling [Cu₂(COO)₄] paddlewheel SBUs and a novel trigonal heterofunctional ligand with a linking acylamide group. [Cu(NAIP²⁻)]_n exhibits a moderate BET surface area of 1060 m² g⁻¹, high CO₂ uptake (4.5 wt% at 0.15 bar and 298 K; 201.8 cm³ g⁻¹ at 20 bar and 298 K) and high selectivity for CO₂ over CH₄ (8.34) and N₂ (38.3) at 273 K.