Spin-isomer conversion of water at room temperature, and quantum-rotor-induced nuclear polarization, in the water-endofullerene H2O@C60
Spin-isomer conversion of water at room temperature, and quantum-rotor-induced nuclear polarization, in the water-endofullerene H2O@C60
Water exists in two forms, para and ortho, that have nuclear spin states with different symmetries. Here we report the conversion of fullerene-encapsulated para-water to ortho-water. The enrichment of para-water at low temperatures is monitored via changes in the electrical polarizability of the material. Upon rapid dissolution of the material in toluene the excess para-water converts to ortho-water. In H216O@C60 the conversion leads to a slow increase in the NMR signal. In H217O@C60 the conversion gives rise to weak signal enhancements attributed to quantum-rotor-induced nuclear spin polarization. The time constants for the spin-isomer conversion of fullerene-encapsulated water in ambient temperature solution are estimated as 30±4 s for the 16O-isotopologue of water, and 16±3 s for the 17O-isotopologue.
1-6
Meier, Benno
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Kouril, Karel
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Bengs, Christian
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Kourilova, Hana
2ca1e000-e47e-4bd2-a6dc-ce9a93e30777
Barker, Timothy
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Elliott, Stuart
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Alom, Shamim
f6b56fb1-7f94-432a-87cd-887f6e5d9f64
Whitby, Richard J.
45632236-ab00-4ad0-a02d-6209043e818b
Levitt, Malcolm H.
bcc5a80a-e5c5-4e0e-9a9a-249d036747c3
29 June 2018
Meier, Benno
ed19bfd6-3347-43f1-9e1a-06e6586ee4d1
Kouril, Karel
75bde80c-90bd-49c4-8b89-ec1a7b39363a
Bengs, Christian
6d086f95-d3e8-4adc-86a5-6b255aee4dd1
Kourilova, Hana
2ca1e000-e47e-4bd2-a6dc-ce9a93e30777
Barker, Timothy
8036dc6d-be45-4b28-8ea9-d073e2142157
Elliott, Stuart
6cc724de-f75f-4c0f-a00a-e712b4e73b12
Alom, Shamim
f6b56fb1-7f94-432a-87cd-887f6e5d9f64
Whitby, Richard J.
45632236-ab00-4ad0-a02d-6209043e818b
Levitt, Malcolm H.
bcc5a80a-e5c5-4e0e-9a9a-249d036747c3
Meier, Benno, Kouril, Karel, Bengs, Christian, Kourilova, Hana, Barker, Timothy, Elliott, Stuart, Alom, Shamim, Whitby, Richard J. and Levitt, Malcolm H.
(2018)
Spin-isomer conversion of water at room temperature, and quantum-rotor-induced nuclear polarization, in the water-endofullerene H2O@C60.
Physical Review Letters, 120 (26), , [266001].
(doi:10.1103/PhysRevLett.120.266001).
Abstract
Water exists in two forms, para and ortho, that have nuclear spin states with different symmetries. Here we report the conversion of fullerene-encapsulated para-water to ortho-water. The enrichment of para-water at low temperatures is monitored via changes in the electrical polarizability of the material. Upon rapid dissolution of the material in toluene the excess para-water converts to ortho-water. In H216O@C60 the conversion leads to a slow increase in the NMR signal. In H217O@C60 the conversion gives rise to weak signal enhancements attributed to quantum-rotor-induced nuclear spin polarization. The time constants for the spin-isomer conversion of fullerene-encapsulated water in ambient temperature solution are estimated as 30±4 s for the 16O-isotopologue of water, and 16±3 s for the 17O-isotopologue.
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Submitted date: 6 February 2018
Accepted/In Press date: 22 May 2018
e-pub ahead of print date: 29 June 2018
Published date: 29 June 2018
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Local EPrints ID: 418356
URI: http://eprints.soton.ac.uk/id/eprint/418356
ISSN: 1079-7114
PURE UUID: 14aa1843-7554-45cd-84d5-933a236bda54
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Date deposited: 01 Mar 2018 17:31
Last modified: 16 Mar 2024 06:14
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Author:
Benno Meier
Author:
Karel Kouril
Author:
Christian Bengs
Author:
Hana Kourilova
Author:
Timothy Barker
Author:
Stuart Elliott
Author:
Shamim Alom
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