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Cryogenic NMR spectroscopy of endohedral hydrogen-fullerene complexes
Ist Teil von
The Journal of chemical physics, 2006-03, Vol.124 (10), p.104507-104507-13
Ort / Verlag
United States: American Institute of Physics
Erscheinungsjahr
2006
Quelle
AIP Journals Complete
Beschreibungen/Notizen
We have observed
H
1
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
H
1
-
H
1
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.
Sprache
Englisch
Identifikatoren
ISSN: 0021-9606
eISSN: 1089-7690
DOI: 10.1063/1.2174012
Titel-ID: cdi_proquest_miscellaneous_67761674
Format
–
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