Abstract
The new thiosilicate Rb 4 Si 4 S 10 (C2/c, a =15.106(4), b =15.164(2), c =9.031(1) Å, β =105.67(3)°, Z =4) was prepared from rubidium sulfide, silicon and sulfur in solid state reactions at 800 °C. In a similar way crystals of Rb 4 Si 4 Se 10 (C2/c, a =15.846(3), b =15.872(3), c =9.325(2) Å, β =105.63(3)°, Z =4) were obtained from reactions at 800 °C using rubidium selenide, silicon and selenium as starting materials. Structural data for the two isotypic phases were obtained from single crystal X-ray diffraction. These novel nonoxidic rubidium chalcogenosilicates contain isolated adamantane-analogous Si 4 Q 4− 10 -anions (Q=S, Se). The anion entities are connected via ionic interaction with the rubidium atoms. The structure and experimental vibrational spectra of Rb 4 Si 4 S 10 are compared to theoretically calculated ones. Graphic
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