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Erschienen in:
2011 | OriginalPaper | Buchkapitel
Preparation and Characterization of Polyhedral Oligosilsesquioxanes
verfasst von : David B. Cordes, Paul D. Lickiss
Erschienen in: Applications of Polyhedral Oligomeric Silsesquioxanes
Verlag: Springer Netherlands
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Polyhedral OligoSilSesquioxanes are often abbreviated by the acronym POS or POSS
®
and are compounds of the general formula Si
n
O
3n/2
R
n
(often denoted as T
n
R
n
). The commonest of these compounds are the cubic T
8
R
8
POS species since many hydrolysis/condensation reactions of simple RSiX
3
compounds (X = Cl, OMe or OEt) give the T
8
R
8
cage as a major product, usually along with small amounts of other T
n
R
n
cages and polymeric by-products. Few T
4
R
4
POS have been prepared as they seem to require very bulky R-groups to stabilize the strained POS system and to prevent formation of larger, more stable POS cages.