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Science 26 April 1991:
Vol. 252. no. 5005, pp. 548 - 551
DOI: 10.1126/science.252.5005.548
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Articles

The Higher Fullerenes: Isolation and Characterization of C76, C84, C90, C94, and C70O, an Oxide of D5h-C70

FRANÇOIS DIEDERICH 1, ROLAND ETTL 1, YVES RUBIN 1, ROBERT L. WHETTEN 1, RAINER BECK 1, MARCOS ALVAREZ 1, SAMIR ANZ 1, DILIP SENSHARMA 1, FRED WUDL 2, KISHAN C. KHEMANI 2, and ANDREW KOCH 2

1 Department of Chemistry and Biochemistry, University of California, Los Angeles, CA 90024-1569
2 Institute for Polymers and Organic Solids, Department of Physics and Chemistry, University of California, Santa Barbara, CA 93106

The toluene extract of the fluffy carbon material produced by resistive heating of graphite contains a variety of molecules larger than C60 and C70 in a total amount of 3 to 4% by weight. Repeated chromatography of this material on neutral alumina has led to the isolation of stable solid samples of C76, C84, C90, and C94. The characterization, which includes mass spectrometry, 13C nuclear magnetic resonance, electronic absorption (ultraviolet/visible) and vibrational (infrared) spectroscopy identifies these all-carbon molecules as higher fullerenes. In addition, C70O, a stable oxide, has been isolated that is structurally and electronically closely related to D5h-C70. This compound forms during the resistive heating process and probably has an oxygen atom inserted between two carbon atoms on the convex external surface of the C70 skeleton.

Submitted on February 11, 1991
Accepted on March 8, 1991


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