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Determination of the structure of alkoxysilane polymers in solution by natural abundance two dimensional 29Si-29Si INEPT DQF COSY NMR

✍ Scribed by Philippe Lux; Francine Brunet; Hervé Desvaux; Joseph Virlet

Book ID
102951483
Publisher
John Wiley and Sons
Year
1993
Tongue
English
Weight
856 KB
Volume
31
Category
Article
ISSN
0749-1581

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✦ Synopsis

Abstract

In order to determine the nature and the structure of polymers formed by condensation of alkoxysilanes, a two‐dimensional INEPT double quantum filtered COSY NMR experiment was developed to observe ^29^Si^29^Si correlations at ^29^Si natural abundance. This experiment was tested on a mixture containing a trimer, [(CH~3~)~3~SiO]~2~Si(CH~3~)~2~, and a tetramer, [(CH~3~)~3~SiOSi(CH~3~)~2~]~2~O. This 2D INEPT DQF COSY experiment was then used to investigate the nature and the structure of the polymers which are formed in the early stages of the condensation reaction of diethoxydimethylsilane (DEDMS) in a DEDMS–water mixture containing a small amount of water at low pH (1.0).

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Combined DEPT 1D and INEPT DQF COSY 2D E
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The polarization transfer in the DEPT experiment is analysed as a function of transfer time A and variable pulse angle 8 for a spin system Zm I:. Zg S. This DEPT experiment applied to 29Si NMR may be tuned for optimum sensitivity and quantitative information and then used as an editing method for th