Reversible photoreduction of Cu(ii)-coumarin metal-organic polyhedra.

We report a new approach for photoinduced reduction of Cu2+ that will enrich the structural diversity of coordination complexes and be a valuable contributor to the development of Cu+/Cu0-based catalysts. To realize controlled Cu2+ reduction, coumarin as a triplet quencher of excited benzophenone was tethered to Cu(ii)-metal-organic polyhedra (MOPs). The photoinduced catalytic activity of the coumarin-MOPs was also examined in a Cu(i)-catalyzed azide-alkyne cycloaddition (CuAAC).