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13C CPMAS Nuclear Magnetic Resonance Study of the Adsorption of 2-Phenethylamine on Clays

Published online by Cambridge University Press:  28 February 2024

Janet F. Bank ,
Gabriel Ofori-Okai  and
Shelton Bank
Janet F. Bank
Affiliation:
Department of Chemistry, State University of New York at Albany, Albany, New York 12222
Gabriel Ofori-Okai
Affiliation:
Department of Chemistry, State University of New York at Albany, Albany, New York 12222
Shelton Bank
Affiliation:
Department of Chemistry, State University of New York at Albany, Albany, New York 12222
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Abstract

2-Phenethylamine 13C-enriched in the beta position was adsorbed on four different aluminum-exchanged clays: hectorite, Barasym, Laponite RD, and lithium taeniolite. The sites for adsorption were characterized by 13C high-resolution cross-polarization magic angle spinning nuclear magnetic resonance (CPMAS-NMR) spectroscopy. Using differences in chemical shift values and linewidths, three different types of bound ammonium compounds and a motionally restricted bound compound were identified. Correlation with charge effects indicated that one of the clay sites was extremely acidic.

The important catalytic sites for the different clays, the edge or platelet face, interlamellar and some combination of both, were probed by using the trimethylsilyl group as a clay-blocking agent. Silylation of aluminum-exchanged Laponite RD and Li taeniolite had little effect on amine adsorption. This indicates that, for these clays, amine adsorption occurred mainly at interlamellar sites. For hectorite, amine adsorption occurred at both surface and interlamellar sites, and silylation had the effect of reducing surface adsorption. Silylation of Barasym resulted in a very interesting shift of adsorption from one kind of surface site to a more acidic surface site.

Keywords

Amine reactions with claysClay acidic sitesSolid state NMR
Type
Research Article
Information
Clays and Clay Minerals , Volume 41 , Issue 1 , February 1993 , pp. 95 - 102
Copyright
Copyright © 1993, The Clay Minerals Society

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