Cesium yttrium selenide
Wiley InterScience Backfile Collection 1832-2000
Chemistry and Pharmacology
Synthesis and Crystal Structure of Cs3Y7Se12The oxidation of yttrium metal with selenium in the presence of CsCl (7 d, 700°C, evacuated silicia tubes) results in the formation of pale yellow, lath-shaped single crystals of Cs3Y7Se12. The crystal structure (orthorhombic, Pnnm, Z = 2, a = 1272.8(3), b = 2627.7(5), c = 413.32(8) pm) consists of edge- and vertex-connected [YSe6] octahedra forming a rocksalt-related network [Y7Se12]3-. One-dimensional infinite channels along , apt to take up extra cations, provide coordination numbers of 6 and 7 + 1, respectively, for two crystallographically different Cs+.
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