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Science 22 May 1992:
Vol. 256. no. 5060, pp. 1191 - 1192
DOI: 10.1126/science.256.5060.1191
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Articles

Scandium Clusters in Fullerene Cages

Costantino S. Yannoni 1, Mark Hoinkis 1, Mattanjah S. de Vries 1, Donald S. Bethune 1, Jesse R. Salem 1, Mark S. Crowder 2, and Robert D. Johnson 1

1 IBM Research Division, Almaden Research Center, 650 Harry Road, San Jose, CA 95120-6099
2 IBM Adstar, 5600 Cottle Rd., San Jose, CA 95193

The production and spectroscopic characterization of fullerene-encapsulated metal-atom clusters is reported. In particular, both solution and solid-state electron paramagnetic resonance (EPR) spectra of Sc3C82 have been obtained. ScC82 also gives an EPR spectrum, but Sc2Cn species—the most abundant metallofullerenes in the mass spectrum—are EPR-silent even though Sc2 is EPR-active in a rare-gas matrix at 4.2 K. The results suggest that the three scandium atoms in Sc3C82 form an equilateral triangle—as was previously suggested for Sc3 molecules isolated in a cryogenic rare-gas matrix. The spectrum of ScC82 has features similar to those found earlier for LaC82 and YC82, suggesting that it can also be described as a +3 metal cation within a -3 fullerene radical anion. An implication of this work is that production of macroscopic quantities of clustercontaining fullerenes may make possible the fabrication of exotic new structures with regular arrays of metal-atom clusters isolated in fullerene molecules, resulting in a new type of host/guest nanostructured material.


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Carbon-Free Fullerenes: Condensed and Stuffed Anionic Examples in Indium Systems.
S. C. Sevov and J. D. Corbett (1993)
Science 262, 880-883
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Stable Compounds of Helium and Neon: He@C60 and Ne@C60.
M. Saunders, H. A. Jimenez-Vazquez, R. J. Cross, and R. J. Poreda (1993)
Science 259, 1428-1430
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Structural and Electronic Properties of La@C82.
K. Laasonen, W. Andreoni, and M. Parrinello (1992)
Science 258, 1916-1918
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Uranium Stabilization of C28: A Tetravalent Fullerene.
T. Guo, M. D. Diener, Y. Chai, M. J. Alford, R. E. Haufler, S. M. McClure, T. Ohno, J. H. Weaver, G. E. Scuseria, and R. E. Smalley (1992)
Science 257, 1661-1664
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