New non-oxo vanadium-(IV) and -(V) complexes

Abstract

Sequential addition of 1,10-phenanthroline (phen) or 2,2′-bipyridine (bipy) followed by 3,5-di-tert-butyl-catechol (H₂dtbc) to oxobis(pentane-2,4-dionato)vanadium(IV) yields [V(dtbc)₂L](L = phen or bipy) which can be oxidised using Ag[SbF₆] to give [V(dtbc)₂L][SbF₆]. The new compounds have been characterised by microanalyses, IR, UV/VIS, ⁵¹V NMR spectroscopy, magnetic susceptibility measurements and electrochemical studies. The X-ray structure of [V(dtbc)₂(bipy)] is reported and compared with those of [V(dtbc)₂(phen)] and [V(dtbc)₂(phen)][SbF₆].