title: 17O MAS NMR studies of oxo-based olefin metathesis catalysts: a critical assessment of signal enhancement methods.
abstract: The DFS enhancement method as applied to17O 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 the17O MAS NMR signal is shown through its successful application to silica-supported olefin metathesis catalysts.
authors.affiliation: Unité de Catalyse et de Chimie du Solide, CNRS UMR 8181, Université de Lille, F-59655 Villeneuve d'Ascq, France. laurent.delevoye@ensc-lille.fr.
authors.forename: D
authors.initials: D
authors.lastname: Grekov
authors.affiliation: Laboratoire de Chimie, Catalyse, Polymères et Procédés, UMR 5265 CNRS, UCBL, ESCPE Lyon, 43 Boulevard du 11 Novembre 1918, F-69616 Villeurbanne Cedex, France.
authors.forename: Y
authors.initials: Y
authors.lastname: Bouhoute
authors.affiliation: Laboratoire de Physico-Chimie des Nano-Objets, CNRS UMR 5215, Université de Toulouse, INSA, UPS, 135 Avenue de Rangueil, F-31077 Toulouse, France.
authors.forename: I
authors.initials: I
authors.lastname: Del Rosal
authors.affiliation: Laboratoire de Physico-Chimie des Nano-Objets, CNRS UMR 5215, Université de Toulouse, INSA, UPS, 135 Avenue de Rangueil, F-31077 Toulouse, France.
authors.forename: L
authors.initials: L
authors.lastname: Maron
authors.affiliation: Laboratoire de Chimie, Catalyse, Polymères et Procédés, UMR 5265 CNRS, UCBL, ESCPE Lyon, 43 Boulevard du 11 Novembre 1918, F-69616 Villeurbanne Cedex, France.
authors.forename: M
authors.initials: M
authors.lastname: Taoufik
authors.affiliation: Unité de Catalyse et de Chimie du Solide, CNRS UMR 8181, Université de Lille, F-59655 Villeneuve d'Ascq, France. laurent.delevoye@ensc-lille.fr.
authors.forename: R M
authors.initials: RM
authors.lastname: Gauvin
authors.affiliation: Unité de Catalyse et de Chimie du Solide, CNRS UMR 8181, Université de Lille, F-59655 Villeneuve d'Ascq, France. laurent.delevoye@ensc-lille.fr.
authors.forename: L
authors.initials: L
authors.lastname: Delevoye