Stability of (C60)2 and epoxide dimers, (C60)2ON, and their anions.
The PM3, AM1, and MINDO3 semiemperical methods are used to calculate the the energy difference between C60ON and C60ON- and the bond dissociation energy necessary to cleave neutral and negatively charged (C60)2 dimers and epoxide dimers, (C60)2ON, to their respective monomers C60, and C60ON/2. The results show that the anions of the dimers are significantly more stable than neutral dimers. This result may explain the higher thermal stability of the observed ferromagnetic phase in photolyzed C60. which has been attributed to epoxide dimers and oligomers. It also provides an explanation for the origin of unpaired electron spin necessary for ferromagnetism.
Owens
Frank J
FJ
Department of the Army, Armament Research Development and Engineering Center, Bldg. 3022, Picatinny, New Jersey 07806, USA. fowens@pica.army.mil