The Steric Effect in Preparations of Vanadium(II)/(III) Dinitrogen Complexes of Triamidoamine Ligands Bearing Bulky Substituents.

The reactions of newly designed lithiated triamidoamines Li ( = iPr, Pen, and Cy) with VCl(THF) under N yielded dinitrogen-divanadium complexes with a μ-N between vanadium atoms [{V()}(μ-N)] ( = iPr () and Pen ()) for the former two, while not dinitrogen-divanadium complexes but a mononuclear vanadium complex with a vacant site, [V()] ( = Cy ()), were obtained for the third ligand. The V-N and N-N distances were 1.7655(18) and 1.