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Investigating FAM-N pulses for signal enhancement in MQMAS NMR of quadrupolar nuclei

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Date
08/2017
Author
Colaux, Henri
Dawson, Daniel M.
Ashbrook, Sharon E.
Keywords
Solid-state MAS NMR spectroscopy
MQMAS
Quadrupolar nuclei
Fast-amplitude modulation
FAM-N pulses
Challenging systems
QD Chemistry
DAS
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Abstract
Although a popular choice for obtaining high-resolution solid-state NMR spectra of quadrupolar nuclei, the inherently low sensitivity of the multiple-quantum magic-angle spinning (MQMAS) experiment has limited its application for nuclei with low receptivity or when the available sample volume is limited. A number of methods have been introduced in the literature to attempt to address this problem. Recently, we have introduced an alternative, automated approach, based on numerical simulations, for generating amplitude-modulated pulses (termed FAM-N pulses) to enhance the efficiency of the triple- to single-quantum conversion step within MQMAS. This results in efficient pulses that can be used without experimental reoptimisation, ensuring that this method is particularly suitable for challenging nuclei and systems. In this work, we investigate the applicability of FAM-N pulses to a wider variety of systems, and their robustness under more challenging experimental conditions. These include experiments performed under fast MAS, nuclei with higher spin quantum numbers, samples with multiple distinct sites, low-γ nuclei and nuclei subject to large quadrupolar interactions.
Citation
Colaux , H , Dawson , D M & Ashbrook , S E 2017 , ' Investigating FAM-N pulses for signal enhancement in MQMAS NMR of quadrupolar nuclei ' , Solid State Nuclear Magnetic Resonance , vol. 84 , pp. 89-102 . https://doi.org/10.1016/j.ssnmr.2017.01.001
Publication
Solid State Nuclear Magnetic Resonance
Status
Peer reviewed
DOI
https://doi.org/10.1016/j.ssnmr.2017.01.001
ISSN
0926-2040
Type
Journal article
Rights
© 2017 The Authors. Published by Elsevier Inc. This is an open access article under the CC BY license (http://creativecommons.org/licenses/BY/4.0/).
Description
The authors would like to thank EPSRC (EP/K503162/1) for the award of a studentship to HFC and the ERC (EU FP7 Consolidator Grant 614290 “EXONMR”) for support. SEA would also like to thank the Royal Society and Wolfson Foundation for a merit award. The UK 850 MHz solid-state NMR Facility used in this research was funded by EPSRC and BBSRC (contract reference PR140003), as well as the University of Warwick including via part funding through Birmingham Science City Advanced Materials Projects 1 and 2 supported by Advantage West Midlands (AWM) and the European Regional Development Fund (ERDF). Financial support from the TGIR-RMN-THC Fr3050 CNRS to access the 800 MHz spectrometer (Lille) is gratefully acknowledged.
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  • University of St Andrews Research
URI
http://hdl.handle.net/10023/11630

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