The Crystal and Molecular Structure of the Symmetrical Silasesquioxane H₈Si₈O₁₂ at 100 K, a Molecular Building Block of Some Zeolites

Abstract

The crystal and molecular structure of the symmetrical octasilasesquioxane H₈Si₈O₁₂ has been redetermined from three dimensional X-ray diffraction data. The H₈Si₈O₁₂ molecule shows effective m3 (Th) symmetry. The molecular packing indicates intermolecular O…Si distances of ~3.6 Å reminiscent of incipient nucleophilic attack of O on Si. The anisotropic displacement parameters indicate non-rigidity of the molecule.