Unprecedented reduction of the uranyl ion [UO2]2+ into a polyoxo uranium(iv) cluster: Synthesis and crystal structure of the first f-element oxide with a M6(µ3-O)8 core

The smooth comproportionation reaction of the U(VI) and U(III) complexes UO2(OTf)2 and U(OTf)3, afforded the hexanuclear U(IV) oxide cluster [U6(micro3-O)8(micro2-OTf)8(py)8], a rare example of a metal oxide with a M6(micro3-O)8 core.