Abstract
The early stages of the acid hydrolysis and condensation of tetraethylorthosilicate (TEOS) have been studied by multinuclear ( 1 H, 17 O, 29 Si) nuclear magnetic resonance spectroscopy. Sub-stoichiometric concentrations of water were used in order to limit the number and complexity of the species formed. TEOS reacts rapidly with water to form hydrolysed monomers that in turn condense at a lower rate to form polymeric products. Detailed peak assignments were made possible through correlations of the time dependence of the NMR spectra obtained for all three nuclei. 29 Si NMR spectroscopy provides the most quantitative information about this system. The importance of field strength for 1 H NMR studies of TEOS is discussed.
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