[Fe24Se26]: A Host-Guest Compound with Unique Fe-Se Topology

Martin Valldor*, Bodo Böhme, Yurii Prots, Horst Borrmann, Peter Adler, Walter Schnelle, Yves Watier, Chang Yang Kuo, Tun Wen Pi, Zhiwei Hu, Claudia Felser, Liu Hao Tjeng

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


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.

Original languageEnglish
Pages (from-to)4626-4631
Number of pages6
JournalChemistry - A European Journal
Issue number13
StatePublished - 18 Mar 2016


  • inorganic synthesis
  • iron
  • magnetic properties
  • Mössbauer spectroscopy
  • X-ray diffraction


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