Formation constants of 1 : 1 adducts of [60]fullerene with naphthalene, phenanthrene, anthracene, pyrene and chrysene have been determined in CCl 4 medium. Ionisation potentials of donor molecules and charge transfer (CT) transition energies of the [60]fullerene adducts have been found to correlate in accordance with the Mulliken equation. From such correlation the electron affinity of [60]fullerene has been calculated to be 2.32 eV in solution.A good estimate for the sp 2 C-sp 2 C resonance integral β in benzenoid hydrocarbons has also been obtained from the observed CT transition energies.

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