FeIII48-Containing 96-Tungsto-16-Phosphate: Synthesis, Structure, Magnetism and Electrochemistry.

The 48-Fe III -containing 96-tungsto-16-phosphate, [Fe III 48 (OH) 76 (H 2 O) 16 (H P 2 W 12 O 48 ) 8 ] 36- ( Fe 48 ), has been synthesized and structurally characterized. This polyanion comprises eight equivalent {Fe III 6 P 2 W 12 } units which are linked in an end-on fashion forming a macrocyclic assembly that contains more iron centers than any other polyoxometalate (POM) known to date. The novel Fe 48 was synthesized by a simple one-pot reaction of an Fe 22 coordination complex with the hexalacunary {P 2 W 12 } POM precursor in water. The title polyanion was characterized by single-crystal XRD, FT-IR, TGA, magnetic and electrochemical studies.