P. Agaskar, V. Day, W. Klemperer
Sep 1, 1987
Citations
0
Influential Citations
68
Citations
Journal
Journal of the American Chemical Society
Abstract
Molecular polyhedral silicates (spherosilicates) whose anionic oxygen atoms have been protected by trimethylsilyl groups are convenient molecular species for examining the properties of isolated polysilicate cage frameworks. At present, three such species are known: the trigonal prismatic (Si/sub 6/O/sub 2/)(OSiMe/sub 3/)/sub 6/, cubic (Si/sub 8/O/sub 12/)(OSiMe/sub 3/)/sub 8/, and pentagonal prismatic (Si/sub 10/O/sub 15/)(OSiMe/sub 3/)/sub 10/ molecules. The family of trimethylsilylated spherosilicates (Me/sub 3/SiOSiO/sub 1.5/)/sub n/ has been restricted to n = 6, 8, and 10 for purely practical reasons. These materials are prepared by trimethylsilylation of the silicate anions Si/sub n/O/sub 2.5n//sup n-/, and soluble anions are known only for n = 6, 8, and 10. The authors describe a new route to trimethylsilylated spherosilicates that utilizes hydridosiloxane precursors and report the synthesis, structure, and stability of three new compounds prepared by this route, (Si/sub 12/O/sub 18/)(OSiMe/sub 3/)/sub 12/, D/sub 3h/-(Si/sub 14/O/sub 21/)(OSiMe/sub 3/)/sub 14/, and C/sub 2v/-(Si/sub 14/O/sub 21/)(OSiMe/sub 3/)/sub 14/.