Disorder and pseudo-symmetry in octakis(trivinylsilyl)octasilicate

Slebodnick, C.; Angel, R.J.; Hanson, B.E.; Agaskar, P.A.; Soler, T.; Falvello, L.R.

doi:10.1107/S0108768108010227

Acta Crystallographica Section B
Acta Crystallographica
Section B STRUCTURAL SCIENCE, CRYSTAL ENGINEERING AND MATERIALS

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Figure 5
An exaggerated schematic representation of possible (but exaggerated) Si₈O₁₂ core symmetries and orientations of the trivinylsilyl arms, as viewed down [001]. Upper trivinylsilyl arms are solid; lower arms are dashed. (a) In the cs521 model of point symmetry 2, all upper arms are rotated in the same direction compared with the lower arms. (b) Increasing the symmetry from 2 to 4 maintains the topology of the trivinylsilyl arms. (c) Increasing the symmetry to 4/m requires significant distortion so that the upper and lower arms overlay. (d) Increasing the symmetry to $[\bar 4]$ requires a change in arm topology, with alternate upper arms rotated in opposite directions.

STRUCTURAL SCIENCE
CRYSTAL ENGINEERING
MATERIALS

ISSN: 2052-5206

Volume 64| Part 3| May 2008| Pages 330-337

doi:10.1107/S0108768108010227

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