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Published October 3, 1991 | public
Journal Article

Fullerenes with metals inside


Fullerenes with a single lanthanum atom trapped on the inside of the carbon cage were produced by laser vaporization of a lanthanum oxide/graphite composite rod in a flow of argon gas at 1200 °C. When sublimed with C_(60) and C_(70), they formed an air-stable film containing principally LaC_(60), LaC_(70), LaC_(74), and LaC_(82). When dissolved in toluene and exposed to air, LaC_(82) was found to be uniquely stable. Evidence was also obtained for coalescence reactions between these fullerenes at high temperatures to form larger cages with as many as three lanthanum atoms inside. Indications have also been obtained for the successful production of KC_(60), C_(59)B, and KC_(59)B where the boron has substituted for a carbon in the soccerball cage. The use of the @ symbol is advocated for specifying such complex fullerenes as (K@C_(59)B).

Additional Information

© 1991 American Chemical Society. Received: August 19, 1991. The delightful suggestion of the use of the @ symbol in formulas for complex fullerenes is due to Ori Cheshnovsky. We thank Lai-Sheng Wang, Jose Conceicao, and Lila Anderson for help and encouragement in the early, fitful beginnings of this work on "dopyballs". This research was supported by the National Science Foundation, the Office of Naval Research, and the Robert A. Welch Foundation, using a cluster FT-ICR apparatus developed with major support from the U.S. Department of Energy, Division of Chemical Sciences.

Additional details

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October 25, 2023