title: Mixed valence η6-arene cobalt(I) and cobalt(II) compound.
abstract: The first carbonyl free mixed valence cobalt(I)/cobalt(II) compound [2{L2Co(I)(η(6)-C7H8)}](2+) [Co(II)2Cl6](2-) (1) [L = PhC(N(t)Bu)2SiCl] was obtained by the reaction of four equivalents of anhydrous CoCl2 with five equivalents of N-heterocyclic chlorosilylene L. In contrast, the reaction of L with CoBr2 yielded [L2CoBr2] (2). Compound 1 was formed by the cleavage of Co-Cl bonds, the reduction of Co(II) to Co(I) and by the coordination of a toluene molecule. The chlorosilylene (L) functions as a reducing agent as well as a neutral σ-donor ligand. The toluene molecule coordinates to the Co(I) atom in an η(6)-fashion.
authors.affiliation: Institut für Anorganische Chemie, Universität Göttingen, Tammannstrasse 4, 37077 Göttingen, Germany.
authors.forename: Ramachandran
authors.initials: R
authors.lastname: Azhakar
authors.forename: Rajendra S
authors.initials: RS
authors.lastname: Ghadwal
authors.forename: Herbert W
authors.initials: HW
authors.lastname: Roesky
authors.forename: Jakob
authors.initials: J
authors.lastname: Hey
authors.forename: Lennard
authors.initials: L
authors.lastname: Krause
authors.forename: Dietmar
authors.initials: D
authors.lastname: Stalke