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- Title
The New Alkali Cyclotrisilicate Cs<sub>8</sub>[Si<sub>6</sub>O<sub>16</sub>].
- Authors
Hlukhyy, Viktor; Fässler, Thomas F.
- Abstract
Transparent single crystals of Cs8[Si6O16] have been obtained by a high-temperature reaction at 900 °C in an arc-welded niobium crucible. The structure of Cs8[Si6O16] was solved and refined from single crystal X-ray diffraction data: new structure type, P $\bar{1}$, Z = 2, a = 9.3544(3) Å, b = 11.1152(4) Å, c = 13.5035(5) Å, α = 101.311(3)°, β = 100.958(3)°, γ = 114.121(3)°, R1 = 0.032. The structure of Cs8[Si6O16] contains isolated dimeric cyclotrisilicate anions [Si6O16]8- that are separated by cesium atoms.The anion consists of six vertex-sharing [SiO4] tetrahedra which form three interconnected rings: two rings consisting of three tetrahedra share edges with the opposite sides of a square of four [SiO4] thetrahedra. With respect to the plane of the four-membered rings the triangles strike a trans-type arrangement. [Si6O16]8- is the first example of the third possible structural arrangement in the class of unbranched dimeric cyclotrisilicate anions.
- Publication
Zeitschrift für Anorganische und Allgemeine Chemie, 2013, Vol 639, Issue 2, p231
- ISSN
0044-2313
- Publication type
Article
- DOI
10.1002/zaac.201200355