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

The DFS enhancement method as applied to O MAS NMR was critically assessed, first on NaPO , 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...

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Bibliographic Details
Published in:Physical chemistry chemical physics : PCCP 2016, Vol.18 (40), p.28157-28163
Main Authors: Grekov, D, Bouhoute, Y, Del Rosal, I, Maron, L, Taoufik, M, Gauvin, R M, Delevoye, L
Format: Article
Language:English
Subjects:
Catalysis
Chemical Sciences
Inorganic chemistry
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Summary:The DFS enhancement method as applied to O MAS NMR was critically assessed, first on NaPO , 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 O MAS NMR signal is shown through its successful application to silica-supported olefin metathesis catalysts.
ISSN:1463-9076
1463-9084
DOI:10.1039/C6CP04667C