Bis(2,4-pentanedionato)vanadium(IV) aryloxides

Complexes of composition [VCl(acac)(2)(OAr1-4)] and [V(acac)(2)(OAr1-4)(2)] (HOAr1 = HOC6H4NO2-4, HOAr2 = HOC6H4OMe-4, HOAr3 = HOC6H4But-4 and HOAr4 = HOC6H2But-2,6-Me-4; acac = 2,4-pentanedionato ion) have been synthesized b y the reaction of [VCl2(acac)(2)] with the respective phenols or their trim ethylsilyl derivatives. The complexes have been characterized by physicoche mical and spectroscopic techniques. They are non-electrolytes in nitrobenze ne. Room temperature magnetic moments in the 1.71-1.82 mu(B) range are cons istent with the V-IV system. The reactions of [VCl(acac)(2)(OAr2)] and [VCl (acac)(2)(OAr3)] with chloride accepters have been studied by conductance t echniques and the formation of ionic complexes of the types [V(acac)(2)(OAr 2,3)][MCl4] (M = Fe, Al or Sb) and [V(acac)(2)(OAr2,3)][MCl6] (M = P or Sb) is indicated by the conductance composition curves. Several of these compl exes have been isolated and characterized.