Organoimidotantalum(V) complexes containing halide, dialkylamide, monoalkylamide, alkoxide, aryloxide, trialkylphosphine and tetrahydrofuran ligands. Crystal structures of [{Ta(µ-Cl)Cl(NSiMe3)[N(SiMe3)2]}2] and [{Ta(µ-OMe)(OMe)(NSiMe3)[N(SiMe3)2]}2]

Abstract

By means of various reactions the compound [TaCl₃{N(SiMe₃)₂}₂]1 has been converted into the following organoimido complexes: [{Ta(µ-Cl)Cl(NSiMe₃)[N(SiMe₃)₂]}₂]2, [{Ta(µ-I)I(NSiMe₃)[N(SiMe₃)₂]}]4, [TaCl₂(NSiMe₃){N(SiMe₃)₂}(thf)]5(thf = tetrahydrofuran), [Ta(NEt)(NHEt){N(SiMe₃)₂}₂]6 and [Ta(NBu^t)(NHEt){N(SiMe₃)₂}₂]7. From 2 the compounds [Ta(NSiMe₃){N(SiMe₃)₂}(NHBu^t)₂]8, [Ta(NSiMe₃){N(SiMe₃)₂}(OBu^t)₂]9 and [{Ta(µ-OMe)(OMe)(NSiMe₃)[N(SiMe₃)₂]}₂]10 were obtained, and from [TaCl₃(OC₆H₂MeBu^t₂)₂], [Ta(NEt)(NHEt)(OC₆H₂MeBu^t₂)₂]11, [Ta(NCH₂Bu^t)(NHCH₂Bu^t)(OC₆H₂MeBu^t₂)₂]12 and [Ta(NBu^t)(NHBu^t)(OC₆H₂MeBu^t₂)₂]13 were prepared. The compounds [TaCl₃(NPh)(PEt₃)₂]14 and [TaCl₃(NPh)(PEt₂Ph)₂]15 were prepared from reactions involving NHPh(SiMe₃) and TaCl₅ in the presence of the trialkylphosphine ligand. All of these new compounds have been characterized by NMR, IR and mass spectra and two of them, 2 and 10, have been structurally characterized by single-crystal X-ray crystallography.