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

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 N-2, CO2 over CH4 and CH4 over N-2 at room temperature, estimated by the Ideal Adsorbed Solution Theory (IAST).