[Cs6Cl][Fe24Se26]: A Host–Guest Compound with Unique Fe–Se Topology |
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| Authors: | Dr Martin Valldor Dr Bodo Böhme Dr Yurii Prots Dr Horst Borrmann Dr Peter Adler Dr Walter Schnelle Dr Yves Watier Dr Chang Yang Kuo Dr Tun‐Wen Pi Dr Zhiwei Hu Prof?Dr Claudia Felser Prof?Dr Liu Hao Tjeng |
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| Institution: | 1. Max Planck Institute for Chemical Physics of Solids, Dresden, Germany;2. ESRF, Grenoble, France;3. National Synchrotron Radiation Research Centre, Hsinchu, Taiwan |
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| 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. |
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| Keywords: | inorganic synthesis iron magnetic properties Mö ssbauer spectroscopy X-ray diffraction |
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