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Cryogenic NMR spectroscopy of endohedral hydrogen-fullerene complexes

Cryogenic NMR spectroscopy of endohedral hydrogen-fullerene complexes
Cryogenic NMR spectroscopy of endohedral hydrogen-fullerene complexes
We have observed 1H NMR spectra of hydrogen molecules trapped inside modified fullerene cages under cryogenic conditions. Experiments on static samples were performed at sample temperatures down to 4.3 K, while magic-angle-spinning (MAS) experiments were performed at temperatures down to 20 K at spinning frequencies of 15 kHz. Both types of NMR spectra show a large increase in the intramolecular 1H–1H dipolar coupling at temperatures below 50 K, revealing thermal selection of a small number of spatial rotational states. The static and MAS spectra were compared to estimate the degree of sample heating in high-speed cryogenic MAS-NMR experiments. The cryogenic MAS-NMR data show that the site resolution of magic-angle-spinning NMR may be combined with the high signal strength of cryogenic operation and that cryogenic phenomena may be studied with chemical site selectivity
0021-9606
104507-104520
Carravetta, Marina
1b12fa96-4a6a-4689-ab3b-ccc68f1d7691
Johannessen, Ole G.
799ccc8c-a2e7-4305-a03a-2dc9f42564ef
Levitt, Malcolm H.
bcc5a80a-e5c5-4e0e-9a9a-249d036747c3
Heinmaa, Ivo
fd7cd386-fb1b-4b8a-a46f-de54c48ef4da
Stern, Raivo
a9db816e-bdfb-4cb1-a8d6-eb4d6f66da40
Samoson, Ago
c8daca67-f4cf-46e1-99c3-fbb24c98d96b
Horsewill, Anthony
105a478d-4d87-4c71-ada7-7db33ecdcdd4
Murata, Y.
60965676-5251-4502-bde1-fb34b1bda592
Komatsu, Koichi
4934594a-8481-4a0f-bd3e-7324391b634a
Carravetta, Marina
1b12fa96-4a6a-4689-ab3b-ccc68f1d7691
Johannessen, Ole G.
799ccc8c-a2e7-4305-a03a-2dc9f42564ef
Levitt, Malcolm H.
bcc5a80a-e5c5-4e0e-9a9a-249d036747c3
Heinmaa, Ivo
fd7cd386-fb1b-4b8a-a46f-de54c48ef4da
Stern, Raivo
a9db816e-bdfb-4cb1-a8d6-eb4d6f66da40
Samoson, Ago
c8daca67-f4cf-46e1-99c3-fbb24c98d96b
Horsewill, Anthony
105a478d-4d87-4c71-ada7-7db33ecdcdd4
Murata, Y.
60965676-5251-4502-bde1-fb34b1bda592
Komatsu, Koichi
4934594a-8481-4a0f-bd3e-7324391b634a

Carravetta, Marina, Johannessen, Ole G., Levitt, Malcolm H., Heinmaa, Ivo, Stern, Raivo, Samoson, Ago, Horsewill, Anthony, Murata, Y. and Komatsu, Koichi (2006) Cryogenic NMR spectroscopy of endohedral hydrogen-fullerene complexes. The Journal of Chemical Physics, 124 (10), 104507-104520. (doi:10.1063/1.2174012).

Record type: Article

Abstract

We have observed 1H NMR spectra of hydrogen molecules trapped inside modified fullerene cages under cryogenic conditions. Experiments on static samples were performed at sample temperatures down to 4.3 K, while magic-angle-spinning (MAS) experiments were performed at temperatures down to 20 K at spinning frequencies of 15 kHz. Both types of NMR spectra show a large increase in the intramolecular 1H–1H dipolar coupling at temperatures below 50 K, revealing thermal selection of a small number of spatial rotational states. The static and MAS spectra were compared to estimate the degree of sample heating in high-speed cryogenic MAS-NMR experiments. The cryogenic MAS-NMR data show that the site resolution of magic-angle-spinning NMR may be combined with the high signal strength of cryogenic operation and that cryogenic phenomena may be studied with chemical site selectivity

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Published date: March 2006
Organisations: Chemistry, Physics & Astronomy, Magnetic Resonance

Identifiers

Local EPrints ID: 35406
URI: https://eprints.soton.ac.uk/id/eprint/35406
ISSN: 0021-9606
PURE UUID: 5c6cd14e-735e-4284-a65c-6ecf1f2d9340
ORCID for Marina Carravetta: ORCID iD orcid.org/0000-0002-6296-2104
ORCID for Malcolm H. Levitt: ORCID iD orcid.org/0000-0001-9878-1180

Catalogue record

Date deposited: 16 May 2006
Last modified: 14 Jul 2018 00:34

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Contributors

Author: Ole G. Johannessen
Author: Ivo Heinmaa
Author: Raivo Stern
Author: Ago Samoson
Author: Anthony Horsewill
Author: Y. Murata
Author: Koichi Komatsu

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