Borato−Cyclopentadienyl Half-Sandwich Complexes. Crystal Structures of [NEt4][C5H5B(C6F5)3]·CH2Cl2 and [NEt4]2[{C5H4B(C6F5)3}Zr(μ-Cl)Cl2]2

Cation exchange of [Li(THF)4]+[C5H5B(C6F5)3]- with [NEt4][BF4] gives the stable, ether-free salt [NEt4][C5H5B(C6F5)3], which reacts cleanly with Zr(NMe2)4 to afford [NEt4][{C5H4B(C6F5)3}Zr(NMe2)3] in good yield. The triamide is readily converted into the crystallographically characterized dimeric trichloride [NEt4]2[{C5H4B(C6F5)3}Zr(μ-Cl)Cl2]2.