15513-84-5Relevant articles and documents
Zandbergen, H. W.
, p. 308 - 317 (1981)
STUDY OF FRUSTRATION EFFECTS IN TWO-DIMENSIONAL TRIANGULAR LATTICE ANTIFERROMAGNETS - NEUTRON POWDER DIFFRACTION STUDY OF VX2, X equals Cl, Br AND I.
Hirakawa,Kadowaki,Ubukoshi
, p. 1814 - 1824 (1983)
In order to study the frustration effects, powder diffraction patterns are studied of VX//2 (X equals Cl, Br and I) considered to be quasi-two-dimensional triangular lattice antiferromagnets. The spins in VCl//2, VBr//2 and VI//2 were found to order at 36. 0, 29. 5 and 16. 3 K respectively forming a three sublattice structure in the basal plane. No critical scattering characteristic for 2D could be seen but the temperature variation of sublattice magnetization is rather close to that for the Ising system.
Redox reactions with bis(η6-arene) derivatives of early transition metals
Calderazzo, Fausto,Englert, Ulli,Pampaloni, Guido,Volpe, Manuel
, p. 3321 - 3332 (2007/10/03)
The reactivity of M(η6-arene)2 derivatives of early transition metals (M = Ti, Cr, Mo, arene = MeC6H5; M = V, Nb, arene = 1,3,5-Me3C6H3) has been investigated and the syntheses of new and known compounds are described. The derivatives M(CH3COO)3, M = Ti, V, Nb, Cr; M(CF 3COO)3, M = Ti, Nb, Cr; M(acac)3, M = Ti, V, Mo, acac = acetylacetonato, and M(F6acac)3, F 6acac = hexafluoroacetylacetonato, M = V, Nb have been prepared by reaction of the metal bis(arene) derivatives with the appropriate Lewis acid. The crystal and molecular structure of V(F6acac)3 has been determined. Hydrogen halides or halogens react with M(η6-arene) 2 with formation of metal halides, a highly reactive form of VCl 3 being obtained from V(η6-1,3,5-Me3C 6H3)2 and hydrogen chloride in heptane. TiCl4 oxidizes Ti(η6-arene)2 with complete loss of the arene ligands. An electron transfer process affording ionic derivatives of formula [M(η6-MeC6H5) 2][TiCl4(THF)2], M = Cr (structurally characterized), Mo, has been observed between the THF-adduct of TiCl4 and the appropriate metal-arene derivative of Group 6.
