Synthesis and spectroscopic properties of homo- and heterobimetallic complexes of oxovanadium(V)†

Equimolar interaction of VO(OPri)3 with N-phenyldiethanolamine (H2L) affords the dimeric complex [VO(L)(m-OPri)]2 (1), which on reaction with different glycols yields a new class of oxovanadium( V) complexes of the type: VO(L)(OGOH) (where L = C6H5N(CH2CH2O–)2 and G = G1 (CMe2CH2 CH2CMe2) 2, G2(CHMeCH2CMe2) 3, G3(CH2CMe2CH2) 4, G4(CH2CEt2CH2) 5, G5(CHMeCHMe) 6, G6(CMe2CMe2) 7), featuring N-phenyldiethanolaminate and glycolate moieties. Complexes (2)–(7) react with Al(OPri)3 to afford novel heterobimetallic coordination complexes of the type: VO(L){(OGO) Al(OPri)2} (G = G1–G6). All these complexes have been characterised by elemental analyses and molecular weight measurements. Spectroscopic (IR, UV–Vis and (1H, 27Al, 51V) NMR) properties of the new complexes have been investigated and their plausible structures suggested.