Synthesis, reactions and characterization of bi- and ter-metallic alkoxides of copper(II) with aluminium(III), zirconium(IV), niobium(V) and tantalum(V)

Abstract

New bi- and ter-metallic alkoxides of copper(II) of the types, [(Bu^tO)₄Al]Cu[M(OPrⁱ)_x] (3a: M = Al(III), x = 4; 3b-c: M = Nb(V) or Ta(V), x=6); [(Bu^tO)₄Al]Cu[Zr₂(OPrⁱ)₉] (3d); [(PrⁱO)₄Al]Cu[Ta(OPrⁱ)₆] (4a) and [(PrⁱO)₆Nb]Cu[Ta(OPrⁱ)₆] (4b) have been synthesized by the equimolar interaction of the appropriate chlorobimetallic alkoxide of copper(II) with a suitable potassium alkoxometallate. Methanolysis of (4b) produced [(MeO)₆Nb]Cu[Ta(OMe)₆] (6). The alcoholysis reactions of (4a) with n-propanol, methanol or tert-butanol gave rise to the products with the composition [(RO)₄Al]Cu[Ta(OR)₆] (R=Prⁿ (5), Me (9a)), [AlCuTa(OMe)₆(OPrⁱ)₄] (9b) or [(Bu^tO)₃(PrⁱO)Al]Cu[Ta(OPrⁱ)₂.