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Characterization of H 2 -Splitting Products of Frustrated Lewis Pairs: Benefit of Fast Magic-Angle Spinning.
- Source :
-
Chemphyschem : a European journal of chemical physics and physical chemistry [Chemphyschem] 2019 Mar 04; Vol. 20 (5), pp. 672-679. Date of Electronic Publication: 2019 Feb 07. - Publication Year :
- 2019
-
Abstract
- Proton spectroscopy in solid-state NMR on catalytic materials offers new opportunities in structural characterization, in particular of reaction products of catalytic reactions such as hydrogenation reactions. Unfortunately, the <superscript>1</superscript> H NMR line widths in magic-angle spinning solid-state spectra are often broadened by an incomplete averaging of <superscript>1</superscript> H- <superscript>1</superscript> H dipolar couplings. We herein discuss two model compounds, namely the H <subscript>2</subscript> -splitting products of two phosphane-borane Frustrated Lewis Pairs (FLPs), to study potentials and limitations of proton solid-state NMR experiments employing magic-angle spinning frequencies larger than 100 kHz at a static magnetic field strength of 20.0 T. The <superscript>1</superscript> H lines are homogeneously broadened as illustrated by spin-echo decay experiments. We study two structurally similar materials which however show significant differences in <superscript>1</superscript> H line widths which we explain by differences in their <superscript>1</superscript> H- <superscript>1</superscript> H dipolar networks. We discuss the benefit of fast MAS experiments up to 110 kHz to detect the resonances of the H <superscript>+</superscript> /H <superscript>-</superscript> pair in the hydrogenation products of FLPs.<br /> (© 2019 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.)
Details
- Language :
- English
- ISSN :
- 1439-7641
- Volume :
- 20
- Issue :
- 5
- Database :
- MEDLINE
- Journal :
- Chemphyschem : a European journal of chemical physics and physical chemistry
- Publication Type :
- Academic Journal
- Accession number :
- 30663843
- Full Text :
- https://doi.org/10.1002/cphc.201900006