Molecular geometries and heats of formation of C60 and C70 as computed by MM2-87

MM2-87 calculations have been performed on C₆₀ (buckminsterfullerence; footballene) and C₇₀ with full energy minimization. The steric energies for C₆₀ and C₇₀ were computed to be 179.9 and 177.9 kcal/mol, respectively. The heats of formation for C₆₀ is found to be more stable than C₆₀. The two bond lengths for C₆₀ were computed to be 1.393 and 1.444 Å. Eight different bond lengths were found for C₇₀ ranging from 1.386 to 1.452 Å. Bond angles, dihedral angles, and moments of inertia are also reported for the compounds.