NMR INVESTIGATION ON IBR-DOPED C-60, WHERE IBR IS IODINE MONOBROMIDE

It was found by C-13-NMR that the doping of iodine monobromide (IBr) i nto C-60 solid changes significantly the electronic states of C-60, in dicating chemical reaction between C-60 and halogen atoms, such as cha rge transfer and bonding. On the other hand, no significant change in C-13-NMR characteristics was observed in C-60 solids doped by iodine ( I-2) and iodine tricloride (ICI3). A possibility of metallic states at C-60 sites was suggested by spin-lattice relaxation time measurement in IBr-doped C-60.