Abstract
The chalcogenoborates Li6-xCsxB10S18and Li6-xCsxB10Se18(x–1) were prepared from stoichiometric amounts of lithium sulfide (selenide), cesium sulfide (selenide), boron and sulfur (selenium) in solid state reactions at higher temperatures. Single crystal X-ray diffraction was used to determine and refine the structures. Crystal data for Li6-xCsxB10S18 are: space group 141/amd (No. 141), a = 9.458(1) Å, c = 26.507(5) Å with Z = 4, and a = 10.028(2) Å, c = 27.743(6) Å for the isotypic Li6-xCsxB10Se18. Both compounds are composed of corner-sharing super-adamantane analogous B10S(e)20-units, forming anionic layers, connected by lithium and cesium cations. The resulting structure represents a new structure type in thio-and selenoborate chemistry.
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