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The polyoctahedral silsesquioxane (POSS) 1,3,5,7,9,11,13,15-octaphenylpentacyclo[9.5.1.13,9.15,15.17,13]octasiloxane (octaphenyl-POSS).
- Source :
-
Acta Crystallographica Section C: Structural Chemistry . Oct2014, Vol. 70 Issue 10, p971-974. 4p. - Publication Year :
- 2014
-
Abstract
- Solvent-free single crystals of 1,3,5,7,9,11,13,15-octaphenylpentacyclo[9.5.1.13,9.15,15.17,13]octasiloxane (abbreviated as octaphenyl-POSS), C48H40O12Si8, were obtained by dehydration/condensation of the tetrol Si4O4(Ph)4(OH)4. The powder pattern generated from the single-crystal data matches well with the experimentally measured powder pattern of commercial octaphenyl-POSS. The geometry of the centrosymmetric molecule in the crystal was compared with that in the gas phase, and had shorter Si-O bond lengths and a broader range of Si-O-Si bond angles. The average Si-O bond length [1.621 (3) Å], and Si-O-Si and O-Si-O bond angles [149 (5) and 109 (1)°, respectively] were within the same range measured previously for octaphenyl-POSS solvates. [ABSTRACT FROM AUTHOR]
- Subjects :
- *SILICONES
*SILOXANES
*SINGLE crystals
*CONDENSATION reactions
*COVALENT bonds
Subjects
Details
- Language :
- English
- ISSN :
- 20532296
- Volume :
- 70
- Issue :
- 10
- Database :
- Academic Search Index
- Journal :
- Acta Crystallographica Section C: Structural Chemistry
- Publication Type :
- Academic Journal
- Accession number :
- 98676254
- Full Text :
- https://doi.org/10.1107/S2053229614019834