title: [Cs6 Cl][Fe24 Se26 ]: A Host-Guest Compound with Unique Fe-Se Topology.
abstract: The novel host-guest compound [Cs6Cl][Fe24Se26] (I4/mmm; a=11.0991(9), c=22.143(2) Å) was obtained by reacting Cs2Se,CsCl, Fe, and Se in closed ampoules. This is the first member of a family of compounds with unique Fe-Se topology, which consists of edge-sharing, extended fused cubane [Fe8Se6Se8/3] blocks that host a guest complex ion, [Cs6Cl](5+). Thus Fe is tetrahedrally coordinated and divalent with strong exchange couplings, which results in an ordered antiferromagnetic state below TN =221 K. At low temperatures, a distribution of hyperfine fields in the Mössbauer spectra suggests a structural distortion or a complex spin structure. With its strong Fe-Se covalency, the compound is close to electronic itinerancy and is, therefore, prone to exhibit tunable properties.
authors.affiliation: Max Planck Institute for Chemical Physics of Solids, 01187, Dresden, Germany. martin.valldor@cpfs.mpg.de.
authors.forename: Martin
authors.initials: M
authors.lastname: Valldor
authors.affiliation: Max Planck Institute for Chemical Physics of Solids, 01187, Dresden, Germany.
authors.forename: Bodo
authors.initials: B
authors.lastname: Böhme
authors.affiliation: Max Planck Institute for Chemical Physics of Solids, 01187, Dresden, Germany.
authors.forename: Yurii
authors.initials: Y
authors.lastname: Prots
authors.affiliation: Max Planck Institute for Chemical Physics of Solids, 01187, Dresden, Germany.
authors.forename: Horst
authors.initials: H
authors.lastname: Borrmann
authors.affiliation: Max Planck Institute for Chemical Physics of Solids, 01187, Dresden, Germany.
authors.forename: Peter
authors.initials: P
authors.lastname: Adler
authors.affiliation: Max Planck Institute for Chemical Physics of Solids, 01187, Dresden, Germany.
authors.forename: Walter
authors.initials: W
authors.lastname: Schnelle
authors.affiliation: ESRF, 71 Avenue des Martyrs, 38000, Grenoble, France.
authors.forename: Yves
authors.initials: Y
authors.lastname: Watier
authors.affiliation: Max Planck Institute for Chemical Physics of Solids, 01187, Dresden, Germany.
authors.forename: Chang Yang
authors.initials: CY
authors.lastname: Kuo
authors.affiliation: National Synchrotron Radiation Research Centre, Hsinchu, 30076, Taiwan.
authors.forename: Tun-Wen
authors.initials: TW
authors.lastname: Pi
authors.affiliation: Max Planck Institute for Chemical Physics of Solids, 01187, Dresden, Germany.
authors.forename: Zhiwei
authors.initials: Z
authors.lastname: Hu
authors.affiliation: Max Planck Institute for Chemical Physics of Solids, 01187, Dresden, Germany.
authors.forename: Claudia
authors.initials: C
authors.lastname: Felser
authors.affiliation: Max Planck Institute for Chemical Physics of Solids, 01187, Dresden, Germany.
authors.forename: Liu Hao
authors.initials: LH
authors.lastname: Tjeng
mesh_terms: D002586:Cesium / Q000737:chemistry*; D002712:Chlorides / Q000737:chemistry*; D018360:Crystallography, X-Ray; D005296:Ferrous Compounds / Q000737:chemistry*; D008958:Models, Molecular; D009942:Organometallic Compounds / Q000737:chemistry*; D013057:Spectrum Analysis
chemical_list: D002712:Chlorides; D005296:Ferrous Compounds; D009942:Organometallic Compounds; D002586:Cesium; C028019:cesium chloride
keywords: Mössbauer spectroscopy; X-ray diffraction; inorganic synthesis; iron; magnetic properties