Preparation and spectroscopic characterisation of a series of heterobimetallic N-phenyldiethanolaminate-alkoxide derivatives of oxovanadium(V)

Reaction of VO(OPri)(3) with two equivalents of N-phenyldiethanolamine (PhDEAH(2)) yields a homometallic complex [VO(PhDEA)(PhDEAH)] 1, which reacts with a number of metal alkoxides to afford heterobimetallic oxovanadium(V) complexes of the types [VO(PhDEA)(2){M(OR)(n-1)}] [where PhDEA = C6H5N(CH2CH2O-)(2)], [M = : Al (n = 3, R = Pr-i) 2; Al (n=3,R=Bu-t)3;Ti(n=4,R=Pr-i)4;Zr(n=4,R=Pr-i)5;Nb(n=5,R=Pr-i)6; Ta (n=5,R=Pr-i)7. The derivative [VO(PhDEA)(OSiPh3)] 8 has been prepared by the equimolar interaction of [VO(PhDEA)(OPri)] with Ph3SiOH. All of these complexes have been characterised by spectroscopic OR; H-1, C-13, Al-27 and V-51 NMR) studies, elemental analyses, and molecular weight measurements. The derivative 2 has also been characterised by FAB mass spectral studies, which supports for its monomeric nature.