Bis(arene)vanadium(0) complexes as a source of vanadium(II) derivatives by both disproportionation of the 6-arene)2>+ cations and oxidation of 6-arene)2>

Article abstract of DOI:10.1016/0022-328X(93)83010-S

The 6-arene)2>⁺ cation (arene = benzene, toluene or mesitylene) is disproportionate to 6-arene)2 and V^II compounds in ether solvents such as THF or 1,2-dimethoxyethane (DME).The extent of disproportionation depends on the nature of both the counteranion and the arene ligand.Addition of the filtered crude reaction mixtures, presumably containing the 6-arene)2> derivatives, to THF gave (arene = benzene or toluene; X = Cl or Br).For X = Cl and arene = toluene, addition to a THF solution of LiI yielded I.The atom connectivity was established for , while I was fully characterized by X-ray diffraction methods.Crystal data: I: monoclinic, space group C2/c (no.15), a 25.199(8), b 13.865(6), c 9.879(4) Angstroem, β 103.98(2) deg, V 3349.3 Angstroem³, Z = 4, D_c 1.523 g cm^-3, μ 17.256 cm^-1, F(000) = 1560.The vanadium(II) derivative VI2(THF)0.7 was obtained, together with 6-mesitylene)2 in the reaction of 6-mesitylene)2> with THF.By reaction of 6-mesitylene)2> with CPh3X (X = Br or I) in 1,2-dimethoxyethane (DME), the dihalides of vanadium(II), have been isolated in good yields.The crystal and molecular structure of the monomeric cis- of pseudo-octahedral geometry has been studied by X-ray diffraction methods.Crystal data: : monoclinic, space group P2₁/n (non-standard No.14), a 7.819(4), b 13.150(4), c 15.535(5) Angstroem, β 90.23(3) deg, V 1587.3(1) Angstroem³, Z = 4, D_c 2.017 g cm^-3, μ 44.231 cm^-1, F(000) = 916.