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An Nmr Study of the Occupation of C60 Interstitial Sites by Oxygen Molecules

Published online by Cambridge University Press:  25 February 2011

Roger A. Assink ,
Douglas A. Loy ,
James E. Schirber  and
Bruno Morosin
Roger A. Assink
Affiliation:
Sandia National Laboratories, Albuquerque, NM 87185
Douglas A. Loy
Affiliation:
Sandia National Laboratories, Albuquerque, NM 87185
James E. Schirber
Affiliation:
Sandia National Laboratories, Albuquerque, NM 87185
Bruno Morosin
Affiliation:
Sandia National Laboratories, Albuquerque, NM 87185
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Abstract

The 13C NMR of FCC C60 under magic angle spinning (MAS) conditionsyields linewidths on the order of 1 Hz at fields of 4.7 T. The spectrum consists of a primary resonance at 143.7 ppm and a minor peak shifted 0.7 ppm downfield. The intensity of the minor resonance relative to the primary resonance was found to vary from 0.6 to 5.5 % depending on the sample history. The downfield shift obeys Curie's law and isattributed to the Fermi contact coupling interaction between paramagnetic oxygen molecules and all 60 carbon atoms of rapidly rotating adjacent C60 molecules. Exposure of the sample to 1 kbar oxygen for 1 3/4 hours resulted in a spectrum of 7 evenly spaced resonances corresponding to 0 to 6 of the adjacent octahedral interstitial sites being filled with oxygen molecules. At ambient pressure, the oxygen diffused out of the lattice on time scales ranging from hours to days.

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Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 270: Symposium M – Novel Forms of Carbon , 1992 , 255
Copyright
Copyright © Materials Research Society 1992

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References

REFERENCES

1. Kroto, H. W., Heath, J. R., O'Brien, S. C., Curl, R. F., Smalley, R. E., Nature 318, 162 (1985).CrossRefGoogle Scholar
2. Kratschmer, W., Lamb, L. D., Fostiropoulos, K., Huffman, D. R., Nature 347, 354 (1990).CrossRefGoogle Scholar
3. (A) The sample was purified by chromatography (Allemand, P.-M. et al. , J. Am. Chem. Soc. 113, 1050 (1991)) from toluene soluble soot purchased from Texas Fullerene Corp, Houston, TX. This material was then annealed for 2 hrs at 225 C. Annealing sharpened the x-ray powder diffraction lines and removed the stacking faults and defects contributing to the “foot” character of the (111) line. (B) Additional material was purchased as 99.5 % pure C60 from Texas Fullerene Corp. This sample as-received showed broad x-ray lines which became sharp upon annealing at 225 C with no evidence of a "foot" on the (111) line. Identical NMR results were obtained with this material.CrossRefGoogle Scholar
4. Creegan, K. M. et al. , poster presented at the MRS Fall Meeting, Boston, MA, 2-6 December 1991.Google Scholar
5. Jesson, J. P. in The Paramagnetic Shift, Mar, G. N. La, Horrocks, W. DeW. Jr., and Holm, R. H., Eds. (Academic Press, New York, 1973) pp. 1–52.Google Scholar
6. Tycko, R. et al. , J. Phys. Chem. 95, 518 (1991); C. S. Yannoni, R. D. Johnson, G. Meijer, D. S. Bethune, J. R. Salem, J. Phys. Chem. 95, 9 (1991).CrossRefGoogle Scholar
7. Tycko, R. et al. , Phys. Rev. Lett. 67, 1886 (1991).CrossRefGoogle Scholar
8. Heiney, P. et al. , Phys. Rev. Lett. 66, 2911 (1991); S. Liu, Y. Lu, M. M. Kappes, J. A. Ibers, Science 254, 408 (1991); W. I. F. David et al., Nature 353, 147 (1991).CrossRefGoogle Scholar
9. Pauling, L., The Nature of the Chemical Bond (Cornell University Press, 1960) pp. 259–64.Google Scholar
10. Assink, R. A., Schirber, J. E., Loy, Douglas A., Morosin, B. and Carlson, G. A., J. Mater. Res., accepted for publication.Google Scholar