A Functionalized Polyoxometalate Bearing a Ferrocenylimido Ligand: Preparation and Structure of [(FcN)Mo6O18]2−

An elusive goal—that of enforcing the interaction of an electron donor at a polyoxometalate acceptor in solution—has been realized. Covalent tethering of a ferrocenyl group to the hexamolybdate cluster was achieved by the introduction of a ferrocenylimido (FcN) ligand, yielding the anion [(FcN)Mo6O18]2− 1 (shown schematically on the right). The simple synthesis of 1 should also be applicable to other systems and thus may provide new opportunities in the field of charge transfer salts with polyoxometalate anions.