Incompletely-Condensed Fluorinated Silsesquioxane: Synthesis and Crystal Structure
AIR FORCE RESEARCH LAB EDWARDS AFB CA PROPULSION DIRECTORATE SPACE AND MISSILE PROPULSION DIV/PROPULSION MATERIALS APPLICATIONS BRANCH
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A recently developed sub-class of POSS, fluorinated polyhedral oligomeric silsesquioxane F-POSS, consists of a Si-O core with a periphery of fluorinated chains ranging from 6-12 carbon atoms in length. These structures possess some of the lowest surface energies for any known crystalline solid. This sub-class has been based on completely-condensed silsesquioxane cages with no means of chemical functionalization. Herein, an incompletely-condensed silsesquioxane, CF3CF27CH2CH28Si8O11OH2, has been synthesized via a multi-step synthesis 52 yield. The structure was confirmed with 29Si NMR, elemental analysis, and Xray diffraction. X-ray diffraction revealed an incompletely-condensed structure that contains inter- and intramolecular hydrogen bonding between silanols. This structure is currently being functionalized to produce a wide variety of functional F-POSS based compounds and polymers.
- Inorganic Chemistry