Mononuclear Niobium Imido and Oxo Complexes Supported by N,N'-Bis(trimethylsilyl)benzamidinate Ligands. X-ray Structures of [Nb(NBu(t))PhC(NSiMe(3))(2)Cl(2)(py)] and [Nb(O)(4-C(6)H(4)Me)C(NSiMe(3))(2)(2)Cl]. - Stewart, P; Blake, A; Mountford, P (Inorganic chemistry, 1997)