[{[(η7-C2B10H12)(η6-C2B10H12)U][K2(thf)5]}2]: A Metallacarborane Containing the Novelη7-C2B10H124− Ligand

The tetranion ligand η7 -C2 B10 H124- has been observed for the first time in 1, which was obtained from the reaction of o-C2 B10 H12 with excess K metal followed by treatment with UCl4 . As shown in the picture (without K cations and coordinated THF molecules), 1 is a centrosymmetric dimer with a bent sandwich structure.