Co-ordination complexes of niobium and tantalum. Part XIV. Alkoxo(2,2′-bipyridine)trichloroniobium(IV) complexes

Abstract

The preparation and properties of crystalline mixed-ligand Nb^IV complexes of formula [NbCl₃(OR)(bipy)](R = Me, Et, Prⁿ, or Buⁿ; bipy = 2,2′-bipyridine) are described. The complexes were prepared by controlled reduction of [NbCl₂(OR)₃] complexes using (2,2′-bipyridine)lithium in tetrahydrofuran. They are paramagnetic with magnetic moments in the range of 1·4–1·6 B.M. and their i.r. spectra show the presence of co-ordinated 2,2′-bipyridine and alkoxo-groups.