VALENCE STATE OF PARAMAGNETIC CENTERS IN FULLERENES

Charge distribution on individual carbon atoms of a fullerene molecule C(n) depends on the number of atoms it comprises, n. Only C60 has the same charge on all its carbon atoms while other molecules containing from n = 32 to n = 84 molecules are characterized by a variety of char ge distributions. A neutral C60 molecule is diamagnetic and does not s how EPR signal. Charged C60v molecules, where v is the valence taking values from v = -6 to v = +1, show EPR signals for odd v and for v = 2 when a fullerene molecule is in the triple' state. EPR lines of isola ted fullerene ions are narrow in the whole temperature range whereas E PR lines of MexC60v in ionic compounds MexC60 are wide and their width decreases with temperature. A model of paramagnetic centers and an em pirical formula relating g-factor to valence have been given.