The first tantalasilsesquioxanes

摘要

Amide routes starting from either Ta(NMe_2)_5 or (C_2B_9H_11)Ta(NMe_2)_3 have been employed to synthesize the first tantalasilsesquioxanes including the "half-sandwich" complex Cy_7Si_7O_12Ta(NMe_2)_2 (3, Cy = c-C_6H_11), the anionic "sandwich" complex [H_2NMe_2][Ta(Cy_7Si_7O_12)_2] (4) as well as the novel "mixed-sandwich" complex Cy_7Si_7O_12Ta(C_2B_9H_11) (5) with the latter being the first example of a carborane/silsesquioxane hybrid compound.