Electron spin resonance studies of chemically and electrochemically generated C60 and (CH3)2C60 monoanions

Electron spin resonance (ESR) data on several chemically generated C60− salts as well as electrochemically generated (CH3)2C60− are presented. The g values for a series of tetraalkylammonium, pyridinium, phosphonium and arsonium salts are independent of the identity of the cation whereas their linewidth varies from 10.0 to 53.6 G. The anion of (CH3)2C60− has a g value of 2.000 and an ESR linewidth of 2.8 G, typical of a system containing a non-degenerate LUMO.