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Long-lived nuclear spin states far from magnetic equivalence

Long-lived nuclear spin states far from magnetic equivalence
Long-lived nuclear spin states far from magnetic equivalence
Clusters of coupled nuclear spins may form long-lived nuclear spin states, which interact weakly with the environment, compared to ordinary nuclear magnetization. All experimental demonstrations of long-lived states have so far involved spin systems which are close to the condition of magnetic equivalence, in which the network of spin-spin couplings is conserved under pair exchanges of symmetryrelated nuclei. We show that the four-spin system of trans-[2,3-13C2]-but-2-enedioate exhibits a long-lived nuclear spin state, even though this spin system is very far from magnetic equivalence. The 4-spin long-lived state is accessed by slightly asymmetric chemical substitutions of the centrosymmetric molecular core. The long-lived state is a consequence of the locally centrosymmetric molecular geometry for the trans isomer, and is absent for the cis isomer. A general group theoretical description of long-lived states is presented. It is shown that the symmetries of coherent and incoherent interactions are both important for the existence of long-lived states.
1463-9076
1-11
Stevanato, Gabriele
13f2e0a2-2ce7-4938-a2ac-274a81196a72
Singha Roy, Soumya
e2de9b1f-ed27-4081-a7c0-6f3e161cf1cb
Hill-Cousins, Joe
8bb86f4d-1d59-4dda-84ca-feadf802ba2c
Kuprov, Ilya
bb07f28a-5038-4524-8146-e3fc8344c065
Brown, Lynda Jane
75aa95fa-5d27-46a7-9dbe-0f465a664f5b
Brown, Richard
21ce697a-7c3a-480e-919f-429a3d8550f5
Pileio, Giuseppe
13f78e66-0707-4438-b9c9-6dbd3eb7d4e8
Levitt, Malcolm H.
bcc5a80a-e5c5-4e0e-9a9a-249d036747c3
Stevanato, Gabriele
13f2e0a2-2ce7-4938-a2ac-274a81196a72
Singha Roy, Soumya
e2de9b1f-ed27-4081-a7c0-6f3e161cf1cb
Hill-Cousins, Joe
8bb86f4d-1d59-4dda-84ca-feadf802ba2c
Kuprov, Ilya
bb07f28a-5038-4524-8146-e3fc8344c065
Brown, Lynda Jane
75aa95fa-5d27-46a7-9dbe-0f465a664f5b
Brown, Richard
21ce697a-7c3a-480e-919f-429a3d8550f5
Pileio, Giuseppe
13f78e66-0707-4438-b9c9-6dbd3eb7d4e8
Levitt, Malcolm H.
bcc5a80a-e5c5-4e0e-9a9a-249d036747c3

Stevanato, Gabriele, Singha Roy, Soumya, Hill-Cousins, Joe, Kuprov, Ilya, Brown, Lynda Jane, Brown, Richard, Pileio, Giuseppe and Levitt, Malcolm H. (2015) Long-lived nuclear spin states far from magnetic equivalence. Physical Chemistry Chemical Physics, 1-11. (doi:10.1039/C4CP05704J).

Record type: Article

Abstract

Clusters of coupled nuclear spins may form long-lived nuclear spin states, which interact weakly with the environment, compared to ordinary nuclear magnetization. All experimental demonstrations of long-lived states have so far involved spin systems which are close to the condition of magnetic equivalence, in which the network of spin-spin couplings is conserved under pair exchanges of symmetryrelated nuclei. We show that the four-spin system of trans-[2,3-13C2]-but-2-enedioate exhibits a long-lived nuclear spin state, even though this spin system is very far from magnetic equivalence. The 4-spin long-lived state is accessed by slightly asymmetric chemical substitutions of the centrosymmetric molecular core. The long-lived state is a consequence of the locally centrosymmetric molecular geometry for the trans isomer, and is absent for the cis isomer. A general group theoretical description of long-lived states is presented. It is shown that the symmetries of coherent and incoherent interactions are both important for the existence of long-lived states.

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Accepted/In Press date: 23 January 2015
e-pub ahead of print date: 2015
Organisations: Organic Chemistry: Synthesis, Catalysis and Flow, Faculty of Natural and Environmental Sciences, Magnetic Resonance

Identifiers

Local EPrints ID: 373705
URI: https://eprints.soton.ac.uk/id/eprint/373705
ISSN: 1463-9076
PURE UUID: c7b1acc8-df70-4541-97fd-05c309d17597
ORCID for Ilya Kuprov: ORCID iD orcid.org/0000-0003-0430-2682
ORCID for Lynda Jane Brown: ORCID iD orcid.org/0000-0002-5678-0814
ORCID for Richard 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: 28 Jan 2015 16:59
Last modified: 14 Jul 2018 00:35

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