Abstract

13C hyperfine coupling constants of the MuC 60 radical have been measured by muon level-crossing spectroscopy, using a dilute solution of 99% enriched 13C 60 in decalin. The signs as well as the magnitudes of the hyperfine constants were determined. The results range from 52.6 to −25.4 MHz and support those calculations which predict an extended distribution of unpaired electron spin density in radical adducts of fullerenes. The hyperfine constants are consistent with published electron spin resonance results for (CD 3) 3CC 60, but contradict a recent report for HC 60, where a considerably smaller value is reported for the largest splitting.

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