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Non‐Oxide Sol–Gel Chemistry: Preparation from Tris(dialkylamino)silazanes of a Carbon‐Free, Porous, Silicon Diimide Gel
Author(s) -
Rovai Riccardo,
Lehmann Christian W.,
Bradley John S.
Publication year - 1999
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/(sici)1521-3773(19990712)38:13/14<2036::aid-anie2036>3.0.co;2-q
Subject(s) - diimide , silica gel , sol gel , chemistry , oxide , tris , condensation , catalysis , silicon , trimer , silicate , ammonia , ethylene oxide , yield (engineering) , carbon fibers , inorganic chemistry , propylene oxide , polymer chemistry , chemical engineering , organic chemistry , materials science , dimer , polymer , molecule , copolymer , biochemistry , physics , perylene , composite number , composite material , thermodynamics , metallurgy , engineering
The acid‐catalyzed ammonolysis of the hitherto unknown compound tris(dimethylamino)silylamine ( 1 ), which is prepared from SiCl 4 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 3 ) 2 N} 2 SiNH] 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.