Valldor Martin, Böhme Bodo, Prots Yurii, Borrmann Horst, Adler Peter, Schnelle Walter, Watier Yves, Kuo Chang Yang, Pi Tun-Wen, Hu Zhiwei, Felser Claudia, Tjeng Liu Hao
Max Planck Institute for Chemical Physics of Solids, 01187, Dresden, Germany.
ESRF, 71 Avenue des Martyrs, 38000, Grenoble, France.
Chemistry. 2016 Mar 18;22(13):4626-31. doi: 10.1002/chem.201504840. Epub 2016 Feb 16.
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. 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.
新型主客体化合物[Cs6Cl][Fe24Se26]（四方晶系I4/mmm；a = 11.0991(9)，c = 22.143(2) Å）通过在封闭安瓿中将Cs2Se、CsCl、Fe和Se反应制得。这是具有独特Fe - Se拓扑结构的化合物家族中的首个成员，该拓扑结构由共享边的、扩展的稠合立方烷[Fe8Se6Se8/3]块组成，这些块容纳客体复合离子Cs6Cl。因此，Fe呈四面体配位且为二价，具有强交换耦合作用，这导致在TN = 221 K以下出现有序反铁磁态。在低温下，穆斯堡尔谱中超精细场的分布表明存在结构畸变或复杂的自旋结构。由于其较强的Fe - Se共价性，该化合物接近电子巡游性，因此易于展现出可调控的性质。
