Portal de Periódicos da CAPES

New compounds containing the triangulo-trichlorotrivanadium(II) moiety

1997; Royal Society of Chemistry; Issue: 7 Linguagem: Inglês

10.1039/a607225i

2050-5671

Peter B. Hitchcock, David L. Hughes, Leslie F. Larkworthy, G.J. Leigh, Celine J. Marmion, J.R. Sanders, Gallienus W. Smith, Jaísa S. de Souza,

Chemical Reaction Mechanisms

The complex [VCl 2 (tmen) 2 ] (tmen = N,N,N′,N ′-tetramethylethane-1,2-diamine) changes spontaneously into a triangulo-trinuclear species [V 3 (µ-Cl) 3 (µ 3 -Cl) 2 (tmen) 3 ] + in solution in tetrahydrofuran upon addition of salts of suitable counter ions. The apical (µ 3 ) chlorides can be replaced by methoxide, and the tmen by diphosphines. Several related materials, all containing the triangulo-V 3 X 3 (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-[VCl 2 (tmen) 2 ] and of [V(MeOH) 6 ]Cl 2 implied the formation of similar triangulo-V 3 Cl 3 species, which appear to be of common occurrence in vanadium(II) chemistry.