Dynamic Nuclear Polarization Efficiency Increased by Very Fast Magic Angle Spinning

Chaudhari SR, Wisser D, Pinon AC, Berruyer P, Gajan D, Tordo P, Ouari O, Reiter C, Engelke F, Copéret C, Lelli M, Lesage A, Emsley L (2017)

Publication Type: Journal article

Publication year: 2017

Journal

Journal of the American Chemical Society American Chemical Society

Book Volume: 139

Pages Range: 10609-10612

Journal Issue: 31

DOI: 10.1021/jacs.7b05194

Abstract

Dynamic nuclear polarization (DNP) has recently emerged as a tool to enhance the sensitivity of solid-state NMR experiments. However, so far high enhancements (>100) are limited to relatively low magnetic fields, and DNP at fields higher than 9.4 T significantly drops in efficiency. Here we report solid-state Overhauser effect DNP enhancements of over 100 at 18.8 T. This is achieved through the unexpected discovery that enhancements increase rapidly with increasing magic angle spinning (MAS) rates. The measurements are made using 1,3-bisdiphenylene-2-phenylallyl dissolved in o-terphenyl at 40 kHz MAS. We introduce a source-sink diffusion model for polarization transfer which is capable of explaining the experimental observations. The advantage of this approach is demonstrated on mesoporous alumina with the acquisition of well-resolved DNP surface-enhanced 27Al cross-polarization spectra.

Authors with CRIS profile

Dorothea Wisser Interdisziplinäres Zentrum Erlangen Catalysis Resource Center (ECRC)

Involved external institutions

École Polytechnique Fédérale de Lausanne (EPFL) CH Switzerland (CH) Eidgenössische Technische Hochschule Zürich (ETHZ) / Swiss Federal Institute of Technology in Zurich CH Switzerland (CH) École normale supérieure de Lyon (ENS) FR France (FR) Università degli Studi di Firenze / University of Florence IT Italy (IT) Bruker BioSpin DE Germany (DE) Aix-Marseille University / Aix-Marseille Université FR France (FR)

How to cite

APA:

Chaudhari, S.R., Wisser, D., Pinon, A.C., Berruyer, P., Gajan, D., Tordo, P.,... Emsley, L. (2017). Dynamic Nuclear Polarization Efficiency Increased by Very Fast Magic Angle Spinning. Journal of the American Chemical Society, 139(31), 10609-10612. https://doi.org/10.1021/jacs.7b05194

MLA:

Chaudhari, Sachin Rama, et al. "Dynamic Nuclear Polarization Efficiency Increased by Very Fast Magic Angle Spinning." Journal of the American Chemical Society 139.31 (2017): 10609-10612.

BibTeX: Download