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[Cs 6 Cl][Fe 24 Se 26 ]: A Host–Guest Compound with Unique Fe–Se Topology
Author(s) -
Valldor Martin,
Böhme Bodo,
Prots Yurii,
Borrmann Horst,
Adler Peter,
Schnelle Walter,
Watier Yves,
Kuo Chang Yang,
Pi TunWen,
Hu Zhiwei,
Felser Claudia,
Tjeng Liu Hao
Publication year - 2016
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201504840
Subject(s) - host (biology) , topology (electrical circuits) , crystallography , materials science , chemistry , combinatorics , mathematics , biology , ecology
The novel host–guest compound [Cs 6 Cl][Fe 24 Se 26 ] ( I 4/ mmm ; a =11.0991(9), c =22.143(2) Å) was obtained by reacting Cs 2 Se, 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 [Fe 8 Se 6 Se 8/3 ] blocks that host a guest complex ion, [Cs 6 Cl] 5+ . Thus Fe is tetrahedrally coordinated and divalent with strong exchange couplings, which results in an ordered antiferromagnetic state below T N =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.