Perfect Statistical Symmetrization of a Heterofunctional Ligand Induced by Pseudo-Copper Trimer in an Expanded Matrix of HKUST‑1

The rare coexistence of the copper monomer and paddle-wheel dimer in the same crystal framework creates an apparent linear pseudocopper trimer configuration that induces an unprecedented equalization of pyridyl and carboxyl functionality in a heterofunctional pyridyl dicarboxylate ligand, leading to an intriguing assembly into a highly symmetrical porous framework, despite the low symmetry of the ligand. The material shows a total CO2 uptake of 55 cm3/g at 1 atm and 273 K.