Copper–Organic Cationic Ring with an Inserted Arsenic–Vanadium Polyanionic Cluster for Efficient Catalytic CrVI Reduction Using Formic Acid

Polyanionic cluster [β-As8V14O42(H2O)]4– is well embedded in a large porous eight-membered cationic ring of the copper ligand, giving a stable host–guest supramolecular system. The assembly exhibits an efficient heterogeneous catalytic performance for the reduction of CrVI using formic acid at ambient temperature.