Novel synthetic alkali-yttrium silicates with a new microporous mixed framework topology: (Rb,Cs)9Y7Si24O63 and isotypic Rb9Y7Si24O63

✍ Scribed by M. Wierzbicka-Wieczorek; U. Kolitsch; E. Tillmanns

• Publisher: John Wiley and Sons
• Year: 2008
• Tongue: English
• Weight: 364 KB
• Volume: 43
• Category: Article
• ISSN: 0232-1300
• DOI: 10.1002/crat.200800325

✦ Synopsis

Abstract

Prismatic colourless crystals of the two novel, isotypic title compounds were obtained by the flux growth technique. The crystal structures have been determined from single‐crystal intensity data in space group R 3 with a = 28.819(4) / 28.799(4), c = 13.916(3) / 13.864(3) Å, V = 10009(3) / 9958(3) Å^3^, Z = 6, R (F) = 4.99 / 6.44%, respectively. They represent a novel structure type with microporous character. The framework is built from six‐membered silicate rings (approximate UDUDUD orientation) containing isolated YO~6~ octahedra and compressed “six‐membered rings”, which in fact build a spiral of corner‐sharing SiO~4~ tetrahedra. Approximately parallel to [111] run two different irregular channels hosting the Rb/Cs and Rb atoms. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)