Cryogenic NMR Spectroscopy of endohedral hydrogen-fullerene complexes

Carravetta, M.; Johannessen, O.G.; Levitt, M.H.; Heinmaa, Ivo; Stern, Raivo; Samoson, Ago; Horsewill, A.; Murata, Y.; Komatsu, K. (2006). Cryogenic NMR Spectroscopy of endohedral hydrogen-fullerene complexes. Journal of Chemical Physics, 124 (10), 104507-1−104507-13.10.1063/1.2174012.
ajakirjaartikkel
Carravetta, M.; Johannessen, O.G.; Levitt, M.H.; Heinmaa, Ivo; Stern, Raivo; Samoson, Ago; Horsewill, A.; Murata, Y.; Komatsu, K.
  • Inglise
Cryogenic NMR Spectroscopy of endohedral hydrogen-fullerene complexes
Journal of Chemical Physics
0021-9606
124
10
2006
104507-1104507-13
Ilmunud
1.1. Teadusartiklid, mis on kajastatud Web of Science andmebaasides Science Citation Index Expanded, Social Sciences Citation Index, Arts & Humanities Citation Index ja/või andmebaasis Scopus (v.a. kogumikud)
WOS

Viited terviktekstile

dx.doi.org/10.1063/1.2174012

Lisainfo

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.
OPEN-CAGE FULLERENE; NUCLEAR-MAGNETIC-RESONANCE; LIQUID-HELIUM TEMPERATURES; ANGLE-SPINNING NMR; NOBLE-GAS ATOMS; MOLECULAR-HYDROGEN; AMORPHOUS-SILICON; SOLID C-60; ENCAPSULATION; DERIVATIVES
ISI, PubMed