Cyclopentadienyl vs Indenyl Substituents. Organolanthanide Complexes and Biscarborane Compounds Derived from a Versatile Ligand, Me2Si(C9H7)(C2B10H11)

A versatile compound, Me2Si(C9H7)(C2B10H11) can be conveniently converted into the monoanion [Me2Si(C9H6)(C2B10H11)]Na, the dianion [Me2Si(C9H6)(C2B10H10)]Na2, and the trianion [Me2Si(C9H6)(C2B10H11)]K3 by treatment with 1 equiv or excess amounts of NaH or K metal in THF, respectively. Reaction of LnCl3 with 1 equiv of [Me2Si(C9H6)(C2B10H11)]Na in THF gave dichloride complexes [η5-Me2Si(C9H6)(C2B10H11)]LnCl2(THF)3 (Ln = Nd (1), Er (2)). They can further react with another equivalent of [Me2Si(C9H6)(C2B10H11)]Na to afford monochloride complexes [η5-Me2Si(C9H6)(C2B10H11)]2LnCl(THF)2 (Ln = Ce (3), Nd (4), Sm (5), Er (6)), which can also be prepared by treatment of LnCl3 with 2 equiv of [Me2Si(C9H6)(C2B10H11)]Na in THF. 4 reacts with excess NaH in THF to produce [Na(THF)6][{η5:σ-Me2Si(C9H6)(C2B10H10)}2Nd] (7), which can also be prepared from the reaction of NdCl3 with 2 equiv of [Me2Si(C9H6)(C2B10H10)]Na2 in THF. Treatment of 2 with 2 equiv of K metal at room temperature yielded [η5:η6-Me2Si(C9H6)(C2B10H11)]E...