Synthesis and Structural Characterization of the First Mixed Lanthanacarborane Incorporating η⁵-Cyclopentadienyl and η⁶-Carboranyl Ligands

Treatment of SmI 2 (THF) x with 2 equiv of [Me 2 Si(C 2 B 10 H 11 )(C 5 H 4 )]Na in THF, followed by extraction with toluene, gave [Me 2 Si(C 2 B 10 H 11 )(C 5 H 4 )]Sm(THF) 2 ( 1 ), which represents the first structurally characterized example of the mixed lanthanacarborane incorporating η 5 -cyclopentadienyl and η 6 -carboranyl ligands. Unlike the SmI 2 case, interaction of YbI 2 (THF) x with 2 equiv of [Me 2 Si(C 2 B 10 H 11 )(C 5 H 4 )]Na in THF afforded [Me 2 Si(C 2 B 10 H 11 )(C 5 H 4 )] 2 Yb(THF) 2 ( 2 ).