Gas Uptake and Supercapacitor Performance of a Highly Connected Porous Co-Metal–Organic Framework Induced by Ligand Bulk

The mimic of a (3,9)-connected xmz framework generates a novel highly connected Co-metal–organic framework ( SNNU-80 ) constructed by trigonal prismatic [Co 3 (OH)(COO) 6 ] building blocks and tripodal pyridyl-dicarboxylate ligands (BPYDB = 4,4′-(4,4′-bipyridine-2,6-diyl)-dibenzoic acid). Compared to the nonporous Co-pyridine-3,5-dicarboxylate xmz metal–organic framework (MOF), the extension of a triangular linker leads to a different geometrical distribution of ligands and thus a porous structure with the topology of 3,3,9T2 for SNNU-80 . Four types of polyhedral cages coexist together, which produce permanent micro- and mesoporosity. Different from MCF-18 assembled by BPYDB with [Ni 3 (OH)(COO) 6 ] showing drastic framework breathing, SNNU-80 is not flexible. As a result, SNNU-80 shows remarkable CO 2 uptake capacity as well as high CO 2 and C 2 hydrocarbons over CH 4 selectivity. Furthermore, the electrochemical measurements show that SNNU-80 is an idea electrode material for supercapacitors due to its highly connected stable porous framework and the pseudocapacitor contribution introduced by the mixed valent system.