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Non-Oxide Sol–Gel Chemistry: Preparation from Tris(dialkylamino)silazanes of a Carbon-Free, Porous, Silicon Diimide Gel

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Rovai,  R.
Research Group Bradley, Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Lehmann,  C.
Service Department Lehmann (EMR), Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Citation

Rovai, R., Lehmann, C., & Bradley, J. S. (1999). Non-Oxide Sol–Gel Chemistry: Preparation from Tris(dialkylamino)silazanes of a Carbon-Free, Porous, Silicon Diimide Gel. Angewandte Chemie, International Edition in English, 38(13-14), 1856-2070. doi:10.1002/(SICI)1521-3773(19990712)38:13/14<2036:AID-ANIE2036>3.0.CO;2-Q.


Cite as: https://hdl.handle.net/11858/00-001M-0000-0024-6595-F
Abstract
The acid-catalyzed ammonolysis of the hitherto unknown compound tris(dimethylamino)silylamine (1), which is prepared from SiCl4 in high yield and purity, results in the preparation of a silicon diimide gel. The probable first step in this process is the acid-catalyzed self-condensation of 1 to the cyclic trimer [{(CH3)2N}2SiNH]3. This ammonolysis under mild conditions in THF provides a semirigid translucent gel. On drying under mild conditions in an ammonia atmosphere this non-oxide gel yields a high surface area silicon diimide xerogel that is the first example of a porous non-oxide silicate gel.