Synthesis of tantalum and niobium complexes that contain the diamidoamine ligand, [(3,4,5-F3C6H2NCH2CH2)2NMe], and the triamidoamine ligand, [(3,5-Cl2C6H3NCH2CH2)3N]

Several niobium and tantalum compounds were prepared that contain either the diamidoamine ligand, (3,4,5-F₃C₆H₂NCH₂CH₂)₂NMe]²⁻ (F₃N₂NMe]²⁻), or the triamidoamine ligand, (3,5-Cl₂C₆H₃NCH₂CH₂)₃N]³⁻ (Cl₂N₂NMe]³⁻). The former include F₃N₂NMe]TaCl₃, F₃N₂NMe]NbCl₃, F₃N₂NMe]TaMe₃, F₃N₂NMe]NbMe₃, (F₃N₂NMe)TaMe₂]MeB(C₆F₅)₃], F₃N₂NMe]Ta(CHSiMe₃)(CH₂SiMe₃), F₃N₂NMe]Ta(CH₂-t-Bu)Cl₂, F₃N₂NMe]Ta(CH-t-Bu)(CH₃), and F₃N₂NMe]Ta(η²-C₂H₄)(CH₂CH₃). The latter include Cl₂N₂NMe]TaCl₂, Cl₂N₂NMe]TaMe₂, Cl₂N₂NMe]Ta(η²-C₂H₄), and Cl₂N₂NMe]Ta(η²-C₂H₂).X-ray diffraction studies were carried out on F₃N₂NMe]Ta(CHSiMe₃)(CH₂SiMe₃), F₃N₂NMe]Ta(η²-C₂H₄)(CH₂CH₃), and Cl₂N₂NMe]TaMe_2..