Tertiary phosphine adducts of [Nb(O)Cl3]

Abstract

A series of tertiary phosphine adducts of [Nb(O)Cl₃] is described. The compounds [Nb(O)Cl₃L₂](L = PMe₃, PMePh₂, PPh₃ or PEt₃), [Nb(O)Cl₃(Ph₂PCH₂CH₂PPh₂)] and [Nb(O)Cl₃(PMe₂Ph)₃] have been prepared via reaction of either [{Nb(O)Cl₃}_n] or [Nb(O)Cl₃(thf)₂](thf = tetrahydrofuran) with a stoichiometric amount of the phosphine in dichloromethane solvent. The influence of the differing ligand fields on the infrared stretching frequency of the niobium–oxygen bond is discussed in terms of the geometry of the complex and the stereoelectronic properties of the attendant ligands.