Paramagnetic relaxation of nuclear singlet states
Paramagnetic relaxation of nuclear singlet states
Nuclear singlet states often display lifetimes that are much longer than conventional nuclear spin relaxation times. Here we investigate the effect of dissolved paramagnetic species on the singlet relaxation of proton pairs in solution. We find a linear correlation between the singlet relaxation rate constant T(S)(-1) and the longitudinal relaxation rate constant T(1)(-1). The slope of the correlation depends on the nature of the paramagnetic relaxation agent, but typically, singlet states are between two to three times less sensitive to paramagnetic relaxation than conventional nuclear magnetization. These observations may be interpreted using a model of partially-correlated local fields acting on the nuclear sites. We explore the effect on singlet relaxation of adding a metal-ion-chelating agent to the solution. We also investigate the effect of ascorbate, which reacts with dissolved oxygen
9128
Tayler, Michael C.D.
d5cb67f4-6c82-4a25-8b2c-75a1212657ed
Levitt, Malcolm H.
bcc5a80a-e5c5-4e0e-9a9a-249d036747c3
19 April 2011
Tayler, Michael C.D.
d5cb67f4-6c82-4a25-8b2c-75a1212657ed
Levitt, Malcolm H.
bcc5a80a-e5c5-4e0e-9a9a-249d036747c3
Tayler, Michael C.D. and Levitt, Malcolm H.
(2011)
Paramagnetic relaxation of nuclear singlet states.
Physical Chemistry Chemical Physics, 13 (20), .
(doi:10.1039/c1cp20471h).
Abstract
Nuclear singlet states often display lifetimes that are much longer than conventional nuclear spin relaxation times. Here we investigate the effect of dissolved paramagnetic species on the singlet relaxation of proton pairs in solution. We find a linear correlation between the singlet relaxation rate constant T(S)(-1) and the longitudinal relaxation rate constant T(1)(-1). The slope of the correlation depends on the nature of the paramagnetic relaxation agent, but typically, singlet states are between two to three times less sensitive to paramagnetic relaxation than conventional nuclear magnetization. These observations may be interpreted using a model of partially-correlated local fields acting on the nuclear sites. We explore the effect on singlet relaxation of adding a metal-ion-chelating agent to the solution. We also investigate the effect of ascorbate, which reacts with dissolved oxygen
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Published date: 19 April 2011
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Magnetic Resonance
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Local EPrints ID: 347850
URI: http://eprints.soton.ac.uk/id/eprint/347850
ISSN: 1463-9076
PURE UUID: 9df1454d-48ff-444c-90fe-1e7e88fc8918
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Date deposited: 31 Jan 2013 13:54
Last modified: 15 Mar 2024 03:08
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Author:
Michael C.D. Tayler
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