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Crystallographic and spectroscopic characterization of a mixed actinide-lanthanide carbide cluster stabilized inside an Ih(7)-C80 fullerene cage.

A mixed actinide-lanthanide cluster fullerene, Sc2UC@Ih(7)-C80, was isolated and fully characterized. For the first time, the single crystal X-ray crystallographic analysis confirms a novel actinide-lanthanide cluster Sc2UC stabilized inside an Ih(7)-C80 cage. Moreover, the U[double bond, length as m-dash]C double bond distance is 2.01 Å, the shortest U[double bond, length as m-dash]C bond confirmed by crystallography so far.