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19F MAS-NMR Study of Structural Fluorine in Some Natural and Synthetic 2:1 Layer Silicates

Published online by Cambridge University Press:  28 February 2024

Laurent Huve ,
Luc Delmotte ,
Pascal Martin ,
Ronan Le Dred ,
Jacques Baron  and
Daniel Saehr
Laurent Huve
Affiliation:
Laboratoire de Matériaux Minéraux, URA-CNRS 0428, Ecole Nationale Supérieure de Chimie de Mulhouse, 3 rue Alfred Werner, 68093 Mulhouse Cedex, France
Luc Delmotte
Affiliation:
Laboratoire de Matériaux Minéraux, URA-CNRS 0428, Ecole Nationale Supérieure de Chimie de Mulhouse, 3 rue Alfred Werner, 68093 Mulhouse Cedex, France
Pascal Martin
Affiliation:
Laboratoire de Matériaux Minéraux, URA-CNRS 0428, Ecole Nationale Supérieure de Chimie de Mulhouse, 3 rue Alfred Werner, 68093 Mulhouse Cedex, France
Ronan Le Dred
Affiliation:
Laboratoire de Matériaux Minéraux, URA-CNRS 0428, Ecole Nationale Supérieure de Chimie de Mulhouse, 3 rue Alfred Werner, 68093 Mulhouse Cedex, France
Jacques Baron
Affiliation:
Laboratoire de Matériaux Minéraux, URA-CNRS 0428, Ecole Nationale Supérieure de Chimie de Mulhouse, 3 rue Alfred Werner, 68093 Mulhouse Cedex, France
Daniel Saehr
Affiliation:
Laboratoire de Matériaux Minéraux, URA-CNRS 0428, Ecole Nationale Supérieure de Chimie de Mulhouse, 3 rue Alfred Werner, 68093 Mulhouse Cedex, France
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Abstract

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High-resolution solid-state, fluorine-19, magic-angle spinning-nuclear magnetic resonance spectroscopy (MAS-NMR) was used to study natural and synthetic fluorinated 2:1 layer silicates of known composition. This technique enabled us to determine directly the coordination of structural fluorine and it was found to be sensitive to both the chemical nature of the octahedral elements (Al, Mg, Li) and the type of octahedral sheet (di- or trioctahedral). The observed chemical shifts at −132, −152, −176 and −182 ppm (relative to CFC13) were assigned to different environments of fluorine. The results were then used to characterize synthetic 2:1 layer silicates with unknown octahedral composition.

Keywords

Clay minerals19F MAS-NMRFluorineLayer silicatesSilicatesSmectites
Type
Research Article
Information
Clays and Clay Minerals , Volume 40 , Issue 2 , April 1992 , pp. 186 - 191
Copyright
Copyright © 1992, The Clay Minerals Society

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