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Nuclear spin conversion of water inside fullerene cages detected by low-temperature nuclear magnetic resonance

Mamone, Salvatore; Concistre, Maria; Carignani, Elisa; Meier, Benno; Krachmalnicoff, Andrea; Johannessen, Ole G.; Lei, Xuegong; Li, Yongjun; Denning, Mark; Carravetta, Marina; Goh, Kelvin; Horsewill, Anthony J.; Whitby, Richard J.; Levitt, Malcolm H.

Authors

Salvatore Mamone S.Mamone@soton.ac.uk

Maria Concistre

Elisa Carignani

Benno Meier

Andrea Krachmalnicoff

Ole G. Johannessen

Xuegong Lei

Yongjun Li

Mark Denning

Marina Carravetta

Kelvin Goh

Anthony J. Horsewill a.horsewill@nottingham.ac.uk

Richard J. Whitby

Malcolm H. Levitt mhl@soton.ac.uk



Abstract

The water-endofullerene H2O@C60 provides a unique chemical system in which freely rotating water molecules are confined inside homogeneous and symmetrical carbon cages. The spin conversion between the ortho and para species of the endohedral H2O was studied in the solid phase by low-temperature nuclear magnetic resonance. The experimental data are consistent with a second-order kinetics, indicating a bimolecular spin conversion process. Numerical simulations suggest the simultaneous presence of a spin di↵usion process allowing neighbouring ortho and para molecules to exchange their angular momenta. Cross-polarization experiments found no evidence that the spin conversion of the endohedral H2O molecules is catalysed by 13C nuclei present in the cages.

Journal Article Type Article
Publication Date May 21, 2014
Journal Journal of Chemical Physics
Print ISSN 0021-9606
Electronic ISSN 0021-9606
Publisher AIP Publishing
Peer Reviewed Peer Reviewed
Volume 140
Issue 19
APA6 Citation Mamone, S., Concistre, M., Carignani, E., Meier, B., Krachmalnicoff, A., Johannessen, O. G., …Levitt, M. H. (2014). Nuclear spin conversion of water inside fullerene cages detected by low-temperature nuclear magnetic resonance. Journal of Chemical Physics, 140(19), doi:10.1063/1.4873343
DOI https://doi.org/10.1063/1.4873343
Publisher URL http://scitation.aip.org/content/aip/journal/jcp/140/19/10.1063/1.4873343
Copyright Statement Copyright information regarding this work can be found at the following address: http://eprints.nottingh.../end_user_agreement.pdf
Additional Information © 2014 AIP Publishing LLC

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://eprints.nottingham.ac.uk/end_user_agreement.pdf





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