The orientation of the principal axes of the electron dipolar interaction tensor in triplet state C60 monoadducts

The time resolved EPR spectra of a fullerene monoadduct triplet state has been studied in nematic phase of E7. The EPR lineshape has been explained with a motionally averaged, preferentially oriented, triplet spectrum. From the knowledge of the order parameters of the C-60 adduct, obtained from the analysis of EPR spectra of a very similar C-60-nitroxide derivative dissolved in the same nematic solvent, it was possible to determine that the X principal axis of the triplet state dipolar tensor is parallel to the C-2 symmetry axis of the C-60 monoadduct