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Enhancement of quantum rotor NMR signals by frequency-selective pulses

Enhancement of quantum rotor NMR signals by frequency-selective pulses
Enhancement of quantum rotor NMR signals by frequency-selective pulses
Quantum-rotor-induced polarisation (QRIP) enhancement is exhibited by substances which contain freely rotating methyl groups in the solid state, provided that the methyl groups contain a 13C nucleus. Strong signal enhancements are observed in solution NMR when the material is first equilibrated at cryogenic temperatures, then rapidly dissolved with a warm solvent and transferred into an NMR magnet. QRIP leads to strongly-enhanced 13C NMR signals, but relatively weak enhancements of the 1H signals. We show that the 1H signals suffer from a partial cancellation of degenerate contributions, which may be corrected by applying a frequency-selective ? pulse to the inner peaks of the 13C multiplet prior to 1H observation.
hyperpolarisation, quantum-rotor-induced polarisation, QRIP, long-lived states, tunnelling, methyl groups
25-28
Roy, Soumya Singha
fa8b7e87-8477-417a-932e-61e36581c720
Dumez, Jean-Nicolas
10fd319d-e42c-42dc-8b2b-34c10475cc27
Stevanato, Gabriele
1ce3829f-b83a-42a2-8468-f1f4401af969
Meier, Benno
ed19bfd6-3347-43f1-9e1a-06e6586ee4d1
Hill-Cousins, Joseph T.
3fd2a389-1612-4d9d-8322-afcc0c401ada
Brown, Richard C.D.
21ce697a-7c3a-480e-919f-429a3d8550f5
Pileio, Giuseppe
13f78e66-0707-4438-b9c9-6dbd3eb7d4e8
Levitt, Malcolm H.
bcc5a80a-e5c5-4e0e-9a9a-249d036747c3
Roy, Soumya Singha
fa8b7e87-8477-417a-932e-61e36581c720
Dumez, Jean-Nicolas
10fd319d-e42c-42dc-8b2b-34c10475cc27
Stevanato, Gabriele
1ce3829f-b83a-42a2-8468-f1f4401af969
Meier, Benno
ed19bfd6-3347-43f1-9e1a-06e6586ee4d1
Hill-Cousins, Joseph T.
3fd2a389-1612-4d9d-8322-afcc0c401ada
Brown, Richard C.D.
21ce697a-7c3a-480e-919f-429a3d8550f5
Pileio, Giuseppe
13f78e66-0707-4438-b9c9-6dbd3eb7d4e8
Levitt, Malcolm H.
bcc5a80a-e5c5-4e0e-9a9a-249d036747c3

Roy, Soumya Singha, Dumez, Jean-Nicolas, Stevanato, Gabriele, Meier, Benno, Hill-Cousins, Joseph T., Brown, Richard C.D., Pileio, Giuseppe and Levitt, Malcolm H. (2015) Enhancement of quantum rotor NMR signals by frequency-selective pulses. Journal of Magnetic Resonance, 250, 25-28. (doi:10.1016/j.jmr.2014.11.004).

Record type: Article

Abstract

Quantum-rotor-induced polarisation (QRIP) enhancement is exhibited by substances which contain freely rotating methyl groups in the solid state, provided that the methyl groups contain a 13C nucleus. Strong signal enhancements are observed in solution NMR when the material is first equilibrated at cryogenic temperatures, then rapidly dissolved with a warm solvent and transferred into an NMR magnet. QRIP leads to strongly-enhanced 13C NMR signals, but relatively weak enhancements of the 1H signals. We show that the 1H signals suffer from a partial cancellation of degenerate contributions, which may be corrected by applying a frequency-selective ? pulse to the inner peaks of the 13C multiplet prior to 1H observation.

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More information

Accepted/In Press date: November 2014
e-pub ahead of print date: November 2014
Published date: January 2015
Keywords: hyperpolarisation, quantum-rotor-induced polarisation, QRIP, long-lived states, tunnelling, methyl groups
Organisations: Magnetic Resonance

Identifiers

Local EPrints ID: 373563
URI: https://eprints.soton.ac.uk/id/eprint/373563
PURE UUID: b4ed728e-3604-4239-9d9b-8078681b5cf8
ORCID for Benno Meier: ORCID iD orcid.org/0000-0003-2258-1507
ORCID for Richard C.D. Brown: ORCID iD orcid.org/0000-0003-0156-7087
ORCID for Giuseppe Pileio: ORCID iD orcid.org/0000-0001-9223-3896
ORCID for Malcolm H. Levitt: ORCID iD orcid.org/0000-0001-9878-1180

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Date deposited: 22 Jan 2015 11:29
Last modified: 14 Jul 2018 00:34

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