17O MAS NMR studies of oxo-based olefin metathesis catalysts: a critical assessment of signal enhancement methods

The DFS enhancement method as applied to 17O MAS NMR was critically assessed, first on NaPO3, a simple binary glass system, and in a second step, on a series of catalysis-related organometallic molecules and materials. The robustness of DFS was investigated for the wide range of anisotropic paramete...

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Published inPhysical chemistry chemical physics : PCCP Vol. 18; no. 40; pp. 28157 - 28163
Main Authors Grekov, D, Bouhoute, Y, Del Rosal, I, Maron, L, Taoufik, M, Gauvin, R M, Delevoye, L
Format Journal Article
LanguageEnglish
Published 28.10.2016
Subjects
Anisotropy
Catalysis
Catalysts
Decomposition reactions
Metathesis
NMR spectroscopy
Olefins
Robustness
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Summary:The DFS enhancement method as applied to 17O MAS NMR was critically assessed, first on NaPO3, a simple binary glass system, and in a second step, on a series of catalysis-related organometallic molecules and materials. The robustness of DFS was investigated for the wide range of anisotropic parameters (quadrupolar coupling and chemical shift anisotropy) encountered in these samples. Emphasis has been put on the variation of signal enhancements with respect to the DFS final sweep frequency, pulse amplitude and pulse duration, while line shape distortion issues were also addressed. Finally, the robustness of DFS enhancement of the 17O MAS NMR signal is shown through its successful application to silica-supported olefin metathesis catalysts.
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ISSN:1463-9076
1463-9084
DOI:10.1039/c6cp04667c