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


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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This work was supported by the U.S. Dept. of Energy under contract DE-AC04-76DP00789.

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Correspondence to Roger A. Assink or Douglas A. Loy or James E. Schirber or Bruno Morosin.

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Assink, R.A., Loy, D.A., Schirber, J.E. et al. An NMR Study of the Occupation of C60 Interstitial Sites by Oxygen Molecules. MRS Online Proceedings Library 270, 255–260 (1992).

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