ROD-8, a rod MOF with a pyrene-cored tetracarboxylate linker: framework disorder, derived nets and selective gas adsorption

Abstract

Reported here is a new Cd^II-based metal–organic framework (MOF), ROD-8, based on the rod secondary building unit (SBU) and tetratopic linker 1,3,6,8-tetrakis(p-benzoic acid)pyrene. The structure of this MOF experiences framework disorder with the two extreme ordered orientations of the ligand, which are topologically related to the two nets, namely lrk and lrl, both derived from the basic net lrj. Moreover, the activated sample, ROD-8a, shows selective gas adsorption of CO₂ over N₂, CO₂ over CH₄ and CH₄ over N₂ at room temperature, estimated by the Ideal Adsorbed Solution Theory (IAST).