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In this study, we report production, isolation, and characterization for the relatively small endohedral metallofullerene, La 2 @C 72. As described, La 2 @C 72 is readily isolated from conventional electric-arc-generated carbon/metal soot. This new species was purified by HPLC chromatography and characterized by laser desorption mass spectrometry and UV-vis spectroscopy. The mass spectrum also demonstrates the presence of the monometal species, La@C 72 , but the absence of empty-cage C 72. Since empty-cage C 72 has not been successfully isolated to date, the results of the present study are in agreement with the argument for metalmediated stabilization of the C 72 carbon cage by lanthanum ions. The chromatographic retention data suggest that the electronic structure of La 2 @C 72 is consistent with a (La 3+) 2 @C 72 6species and the prediction of a relatively small dipole moment.

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Copyright by the AIP Publishing. Heflin, JR; Marciu, D; Figura, C; et al., "Enhanced nonlinear optical response of an endohedral metallofullerene through metal-to-cage charge transfer," Appl. Phys. Lett. 72, 2788Lett. 72, (1998; http:// dx

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