Copper–Organic Cationic Ring with an Inserted Arsenic–Vanadium Polyanionic Cluster for Efficient Catalytic Cr^VI 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 Cr^VI using formic acid at ambient temperature.