[TaCl(µ-Cl)(NBut)(NHBUt)(NH2But)]2; a tantalum(V) complex containing terminal imido, amido, and amino ligands

Imido complexes of niobium and tantalum(V) are prepared by the reaction of the pentachlorides with Me3SiNHBut: with excess of t-butylamine, imido, amido, and amino ligands are formed about the same metal centre, as shown in an X-ray crystallographic study of the title complex.