New compounds containing the triangulo-trichlorotrivanadium(II) moiety

Abstract

The complex [VCl₂(tmen)₂ ] (tmen = N,N,N′,N ′-tetramethylethane-1,2-diamine) changes spontaneously into a triangulo-trinuclear species [V₃(µ-Cl)₃(µ₃-Cl)₂ (tmen)₃ ]⁺ in solution in tetrahydrofuran upon addition of salts of suitable counter ions. The apical (µ₃ ) chlorides can be replaced by methoxide, and the tmen by diphosphines. Several related materials, all containing the triangulo-V₃X₃ (X = Cl or Br) motif, were characterised by mass spectroscopy, X-ray diffraction and other techniques. These clusters are antiferromagnetic both in solution and in the solid state. Thermogravimetric analysis of trans-[VCl₂(tmen)₂ ] and of [V(MeOH)₆ ]Cl₂ implied the formation of similar triangulo-V₃Cl₃ species, which appear to be of common occurrence in vanadium(II) chemistry.

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