Solid-state ESR and C-13 NMR spectra indicate that two electronic stat
es of C-60(-) exist in KC60THF)(x) (0 < x < 1) which can be assigned t
o ground (2)A (arising from the C-60(-)... K+ loose ion-pair) and (2)E
(arising from the C-60(-)-K+(THF) tight ion-pair) states, originating
from the splitting of the T-2(1u) state induced by Jahn-Teller distor
tion.