Esr measurements of C-60(-) anion crystals

The anisotropic components of the g factor of C-60(-) were determined with accuracy from the analysis of angular dependent ESR spectra of single crystal C-60(-) salts. The evaluation of the g factor was performed according to the classification of symmetry of the C-60(-) geometry. It was found out from the evaluation that the molecular structure of C-60(-) should be distorted to the lower symmetry of C-2h or C-i. This conclusion was well explained theoretically by the ab initio MO calculations.