title: From WCl6 to WCl2: Properties of Intermediate Fe-W-Cl Phases.
abstract: Phenomenological studies of WCl6 reduction with transition metal powders M = Mn, Fe, and Co have been recently reported. These reactions involve a series of reductive intercalation steps of M atoms into layered tungsten chloride arrangements, followed by exsolution of MCl2. In the series M = Fe, the presence of divalent iron is evidenced for Fe(x)WCl6, FeW2Cl10, Fe2W2Cl10, and (Fe,W)Cl2 by Mössbauer spectroscopy. Magnetic properties are reported. Bonding characteristics between tungsten atoms in edge-sharing [W2Cl10](n-) bioctahedra reveal that a double bond can be addressed to FeW2Cl10. A similar situation appears for Fe2W2Cl10, due to the localized and thus nonbonding character of the two electrons in the δ orbitals of this compound.
authors.forename: Agnieszka
authors.initials: A
authors.lastname: Mos
authors.forename: Cristina
authors.initials: C
authors.lastname: Castro
authors.affiliation: Institute for Applied Materials, Karlsruhe Institute of Technology , Post Office Box 3640, 76021 Karlsruhe, Germany.
authors.forename: Sylvio
authors.initials: S
authors.lastname: Indris
authors.forename: Markus
authors.initials: M
authors.lastname: Ströbele
authors.forename: Reinhold F
authors.initials: RF
authors.lastname: Fink
authors.forename: Hans-Jürgen
authors.initials: HJ
authors.lastname: Meyer