Cryogenic NMR spectroscopy of endohedral hydrogen-fullerene complexes.

@article{Carravetta2006CryogenicNS,
  title={Cryogenic NMR spectroscopy of endohedral hydrogen-fullerene complexes.},
  author={M. Carravetta and O. G. Johannessen and M. H. Levitt and I. Heǐnmaa and Raivo Stern and A. Samoson and A. J. Horsewill and Y. Murata and K. Komatsu},
  journal={The Journal of chemical physics},
  year={2006},
  volume={124 10},
  pages={
          104507
        }
}
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… Expand
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