EPR study of radical anions of C60 and C70
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Utilizing highly polar solvents for the stabilization of Fullerene anions, electrochemical and chemical reduction resulted in narrow single line EPR spectra for the monoanions of C60 and C70 being characterized byg=2.0001(1), ΔB=0.075 mT,g=2.0019(1), ΔB=0.016 mT, respectively. Apparently, the orbital degeneracy of the C60 monoanion is lifted under these conditions to such an extent, that the abnormal large spin lattice relaxation rate believed to be responsible for the approximately 5 mT line width of the monoanion is sufficiently reduced.13C enrichment resulted in noticeable line broadening, allowing an estimate of the average13C hyperfine coupling constanta ave=0.1 mT.
KeywordsFullerene Line Width Electrochemical Reduction TMEDA HMPA
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