Application of ²⁹Si NMR spectroscopy to study of alkaline aqueous and alcoholic tetraoctylammonium (TOA) silicate solutions

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• 作者：Nasser Goudarzi ; M. Arab Chamjangali ; G. Bagherian
• 关键词：Tetraoctylammonium (TOA) ; ²⁹Si NMR spectroscopy ; Silicate species ; Esterification ; Structure-directing ; Alcoholic silicate solution
• 刊名：Journal of Molecular Structure
• 出版年：2010
• 出版时间：8 October 2010
• 年：2010
• 卷：982
• 期：1-3
• 页码：127-132
• 全文大小：599 K

文摘

²⁹Si NMR spectroscopy is a powerful tool for studying the silicate species existing in aqueous and non-aqueous solutions. In the present work, ²⁹Si NMR spectroscopy is used to characterize the species present in alkaline alcoholic solutions of silicates. Tetraoctylammonium (TOA) hydroxide is used as a template. The effects of polymerization/depolymerization of silicate anions on alkaline alcoholic solutions are investigated using different alcohols (methanol, 1-propanol, 1,3-propane-diol, and glycerin) by ²⁹Si NMR spectroscopy. The esterification of monomeric silicate, Si(OH)₄, in the presence of different alcohols is also studied. Esterification of Si(OH)₄ depends on the alkyl chain as well as the number of hydroxyl groups present in the alcohol.