Abstract
The EPR spectra of endohedral metallofullerenes (EMF), La-EMF and Y-EMF, which were free of admixtures of C60 and of other empty fullerenes, were examined. Endohedral metallofullerenes were prepared by extraction of fullerene-containing soots with DMF. New signals withg factors close to those of fullerene radical anions were observed in the EPR spectra of solutions of EMF in DMF and DMSO. At −20 °C, these signals are observed as a doublet (ΔH pp ≈0.04 mT) and singlet (ΔH pp ≈0.01 mT) in solutions of La-EMF and Y-EMF, respectively. These EPR signals belong to solvated La@C82 and Y@C82 molecules and are characterized by small hyperfine interaction constantsa M due to a substantial decrease in the spin density of the unpaired electron at the metal atom.
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Published inIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 10, pp. 1765–1769, October, 2000.
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Koltover, V.K., Estrin, Y.I., Bubnov, V.P. et al. New EPR signals of endohedral metallofullerenes. Russ Chem Bull 49, 1745–1748 (2000). https://doi.org/10.1007/BF02496346
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DOI: https://doi.org/10.1007/BF02496346