The Higher Fullerenes: Isolation and Characterization of C 76 , C 84 , C 90 , C 94 , and C 70 O, an Oxide of D 5h -C 70
- 26 April 1991
- journal article
- other
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 252 (5005) , 548-551
- https://doi.org/10.1126/science.252.5005.548
Abstract
The toluene extract of the fluffy carbon material produced by resistive heating of graphite contains a variety of molecules larger than C 60 and C 70 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 C 76 , C 84 , C 90 , and C 94 . The characterization, which includes mass spectrometry, 13 C nuclear magnetic resonance, electronic absorption (ultraviolet/visible) and vibrational (infrared) spectroscopy identifies these all-carbon molecules as higher fullerenes. In addition, C 70 O, a stable oxide, has been isolated that is structurally and electronically closely related to D 5 h -C 70 . 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 C 70 skeleton.Keywords
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