Newly Applied Two-Dimensional Solid-State NMR Correlation Techniques for the Characterization of Organically Modified Silicates |
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| Authors: | Babonneau F Gualandris V Maquet J Massiot D Janicke MT Chmelka BF |
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| Institution: | (1) Chimie de la Matière Condensée, UPMC/CNRS, 4 Place Jussieu, 75005 Paris, France;(2) CNRS-CRMHT, 45071 Orléans Cedex 2, France;(3) Dept. of Chemical Engineering, University of California Santa Barbara, CA 93106, USA |
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| Abstract: | This paper highlights the use of two-dimensional (2D) solid-state NMR correlation techniques to probe the chemical homogeneity of organically modified silicate networks. Specifically, 29Si{1H} heteronuclear correlation (HETCOR) NMR experiments have revealed the spatial proximity of the two types of Si units present in a gel obtained from co-hydrolysis of methyldiethoxysilane and triethoxysilane. Similar information has also been obtained by using 2D 1H homonuclear correlation NMR spectroscopy. Such experiments were only possible by combining the use of high magnetic field (14.10 T) with fast MAS spinning rate (30 kHz). |
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| Keywords: | hybrid systems polysiloxanes structure solid state NMR |
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