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Science 18 March 1994:
Vol. 263. no. 5153, pp. 1585 - 1587
DOI: 10.1126/science.263.5153.1585
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Articles

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

Bruno Herreros 1, Stuart W. Carr 2, and Jacek Klinowski 1

1 Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, UK.
2 Unilever Research, Port Sunlight Laboratory, Bebington, Wirral L63 3JW, UK.

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.

Submitted on October 25, 1993
Accepted on December 17, 1993


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Stable Five- and Six-Coordinated Silicate Anions in Aqueous Solution.
S. D. Kinrade, J. W. Del Nin, A. S. Schach, T. A. Sloan, K. L. Wilson, and C. T. Knight (1999)
Science 285, 1542-1545
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