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Characterization of Organically Modified Silicates by 17O Solid State MAS and MQ-MAS NMR

Published online by Cambridge University Press:  10 February 2011

V. Gualandris ,
J. Maquet ,
F. Babonneau ,
P. Florian  and
D. Massiot
V. Gualandris
Affiliation:
Chimie de la Matière Condensèe, UPMC - CNRS, 4 place Jussieu, 75005 Paris, France
J. Maquet
Affiliation:
Chimie de la Matière Condensèe, UPMC - CNRS, 4 place Jussieu, 75005 Paris, France
F. Babonneau
Affiliation:
Chimie de la Matière Condensèe, UPMC - CNRS, 4 place Jussieu, 75005 Paris, France
P. Florian
Affiliation:
CRMHT- CNRS, ID avenue de la Recherche Scientifique, 45071 Orléans cedex 2, France
D. Massiot
Affiliation:
CRMHT- CNRS, ID avenue de la Recherche Scientifique, 45071 Orléans cedex 2, France
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Abstract

Organically modified silicates have been prepared, using methyltriethoxysilane and tetraethoxysilane in various molar ratios. The final network is thus composed of trifunctionnal T units and tetrafunctionnal Q units. Three types of oxo bridges can be formed through the competitive self-condensation or co-condensation reactions : (T)-O-(T), (Q)-O-(Q) and (T)-O-(Q). 17O-enriched water was used as reactant in order to selectively enrich the various oxo bridges, and to perform 17O solid state MAS-NMR. The combination of MAS experiments recorded at two different magnetic fields, and of the recently discovered MQ-MAS experiments allowed us to identify clearly the three types of oxo bridges. Quantitative analysis was extracted from the MAS-NMR spectra, and compared with calculations based on randomly distributed Si units.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 576: Symposium DD – Organic/Inorganic Hybrid Materials II , 1999 , 21
Copyright
Copyright © Materials Research Society 1999

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References

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