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Cs(3)Sm(7)Se(12)

The title compound, tricaesium hepta­samarium(III) dodeca­selenide, is setting a new starting point for realization of the channel structure of the Cs(3) M (7)Se(12) series, now with M = Sm, Gd–Er. This Cs(3)Y(7)Se(12)-type arrangement is structurally based on the Z-type sesquiselenides M (2)Se(3) a...

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Detalles Bibliográficos
Autores principales: Schneck, Christof, Elbe, Andreas, Schurz, Christian M., Schleid, Thomas
Formato: Online Artículo Texto
Lenguaje:English
Publicado: International Union of Crystallography 2011
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3254269/
https://www.ncbi.nlm.nih.gov/pubmed/22259312
http://dx.doi.org/10.1107/S1600536811051919
Descripción
Sumario:The title compound, tricaesium hepta­samarium(III) dodeca­selenide, is setting a new starting point for realization of the channel structure of the Cs(3) M (7)Se(12) series, now with M = Sm, Gd–Er. This Cs(3)Y(7)Se(12)-type arrangement is structurally based on the Z-type sesquiselenides M (2)Se(3) adopting the Sc(2)S(3) structure. Thus, the structural set-up of Cs(3)Sm(7)Se(12) consists of edge- and vertex-connected [SmSe(6)](9−) octa­hedra [d (Ø)(Sm(3+) – Se(2−)) = 2.931 Å], forming a rock-salt-related network [Sm(7)Se(12)](3−) with channels along [001] that are apt to take up monovalent cations (here Cs(+)) with coordination numbers of 7 + 1 for one and of 6 for the second cation. The latter cation has a trigonal–prismatic coordination and shows half-occupancy, resulting in an impossible short distance [2.394 (4) Å] between symmetrically coupled Cs(+) cations of the same kind. While one Sm atom occupies Wyckoff position 2b with site symmetry ..2/m, all other 11 crystallographically different atoms (namely 2 × Cs, 3 × Sm and 6 × Se) are located at Wyckoff positions 4g with site symmetry ..m.