Non-Oxide Sol–Gel Chemistry: Preparation from Tris(dialkylamino)silazanes of a Carbon-Free, Porous, Silicon Diimide Gel
✍ Scribed by Riccardo Rovai; Christian W. Lehmann; John S. Bradley
- Publisher
- John Wiley and Sons
- Year
- 1999
- Tongue
- English
- Weight
- 96 KB
- Volume
- 38
- Category
- Article
- ISSN
- 0044-8249
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✦ Synopsis
The acid-catalyzed ammonolysis of the hitherto unknown compound tris(dimethylamino)silylamine (1), which is prepared from SiCl 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 [{(CH)N}SiNH]. 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.