5-Coordinate Si Compounds as Intermediates in the Synthesis of Silicates in Nonaqueous Media

Sodium silicoglycolate, an organosilicon compound in which silicon is in 5-coordination with respect to oxygen, is shown to be a reaction intermediate in the synthesis of a purely siliceous sodalite with ethylene glycol as solvent. The presence of silicon-29 nuclear magnetic resonances at -105.5 ± 0...

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Bibliographic Details
Published in:Science (American Association for the Advancement of Science) 1994-03, Vol.263 (5153), p.1585-1587
Main Authors: Herreros, Bruno, Carr, Stuart W., Klinowski, Jacek
Format: Article
Language:English
Subjects:
Atmospherics
Chemical composition
Chemistry
Exact sciences and technology
Gels
Glycols
Nuclear magnetic resonance
Organic chemistry
Organometalloidal and organometallic compounds
Polymers
Preparations and properties
Si derivatives
Silicates
Sodalite
Sodium
Teeth
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Summary:Sodium silicoglycolate, an organosilicon compound in which silicon is in 5-coordination with respect to oxygen, is shown to be a reaction intermediate in the synthesis of a purely siliceous sodalite with ethylene glycol as solvent. The presence of silicon-29 nuclear magnetic resonances at -105.5 ± 0.3 parts per million in solution and -102.7 parts per million in the solid state as well as x-ray powder diffraction patterns demonstrate that 5-coordinate silicon is intimately involved in the synthesis. Silicon compounds of the 5-coordinate type are highly reactive and are promising starting materials for the synthesis of novel silicone polymers, molecular sieves, glasses, semiconductors, and ceramics. We have used sodium silicoglycolate to prepare the molecular sieve silicalite as well as sodalites of different compositions.
ISSN:0036-8075
1095-9203
DOI:10.1126/science.263.5153.1585