F. Feher, D. Newman, John F. Walzer
Mar 1, 1989
Citations
5
Influential Citations
455
Citations
Quality indicators
Journal
Journal of the American Chemical Society
Abstract
The hydrolytic condensation of cyclohexyltrichlorosilane (CySiCl/sub 3/) affords (Cy/sub 7/Si/sub 7/O/sub 9/(OH)/sub 3/) (1), (Cy/sub 6/Si/sub 6/O/sub 9/) (2), and (Cy/sub 8/Si/sub 8/O/sub 11/(OH)/sub 2/) (3a). Trisilanol 1 and 3b, the bis(triphenyltin) derivative of 3a, have been structurally characterized by single-crystal X-ray diffraction studies. Trisilanol 1 undergoes corner-capping reactions with trifunctional monomers (e.g., R'SiCl/sub 3/, MeGeCl/sub 3/, MeSnCl/sub 3/), is selectively monosilylated to (Cy/sub 7/Si/sub 7/O/sub 9/(OH)/sub 2/OTMS) (6a) with chlorotrimethylsilane, and can be dehydrated to (Cy/sub 7/Si/sub 7/O/sub 10/(OH)) (7a). Comparison of the molecular structure of 1 with (111) /beta/-cristobalite and (0001) /beta/-tridymite reveals many structural similarities. Silsesquioxanes 1, 6a, and 7a are discussed as models for silica surfaces.