Pentacoordinated molecules. 79. Pentacoordinate acyclic and cyclic anionic oxysilicates. A silicon-29 NMR and X-ray structural study

…, V Chandrasekhar, JJ Harland…

Index: Swamy, K.C. Kumara; Chandrasekhar; Harland, John J.; Holmes, Joan M.; Day, Roberta O.; Holmes, Robert R. Journal of the American Chemical Society, 1990 , vol. 112, # 6 p. 2341 - 2348

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Citation Number: 65

Abstract

Abstract: Variable temperature 29Si NMR spectral measurements revealed the formation of acyclic anionic silicates,[R,,'Si (OR),-,][K, 18-crown-6], n= 0-3, from reactions of alkoxy and aryloxysilanes with the respective potassium alkoxide or potassium aryloxide in the presence of 18-crown-6. This elusive class of substances has been proposed as model intermediates in the sol-gel process. In the case of [PhSi (OCH2CF3) 4][K, 18-crown-6], ...