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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).

Authors :
Chinnam, Parameswara Rao
Gau, Michael R.
Schwab, Joseph
Zdilla, Michael J.
Wunder, Stephanie L.
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]

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