Lanthanum complexes with the bis(o-methoxyphenyl)phosphide ligand

Abstract

Complexes of La and Y with the chelating bis(o-methoxyphenyl)phosphide ligand have been prepared. Thus [Ln(NPrⁱ₂)₃(thf)](thf = tetrahydrofuran) or [Ln{N(SiMe₃)₂}₃] react with 1 equivalent of bis(o-methoxyphenyl)phosphine at room temperature to yield [Ln{P(C₆H₄OMe-o)₂}₃] as yellow crystalline solids. The complex [La(NPrⁱ₂){P(C₆H₄OMe-o)₂}₂] can be prepared by reaction of [La(NPrⁱ₂)₃(thf)] with 2 equivalents of the phosphine at 0 °C. The bimetallic complex [(Prⁱ₂N)₂La{µ-P(C₆H₄OMe-o)₂}₂Li(thf)] has been prepared by reaction of Li[La(NPrⁱ₂)₄] with 2 equivalents of the phosphine, and characterised by X-ray diffraction in the solid state as its toluene solvate. Crystal data: monoclinic, space group C2/c(no. 15), a= 17.22(5), b= 14.782(7), c= 21.710(4)Å, β= 104.11(2)°, Z= 4, final R= 0.064, R′= 0.079.