Complexes of fullerene C₇₀ with aniline and various substituted anilines have been studied in CCl₄ medium by electronic absorption spectroscopy. An absorption band due to a charge transfer (CT) transition is observed in the visible region. The experimental CT transition energies are well correlated (through Mulliken’s equation) with the ionization potentials (ID) of the series of anilines studied. From an analysis of this correlation, the electron affinity of C₇₀ has been found to be 2.28 eV. The degree of charge transfer in the ground state of the complexes has been found to be very low (0.2-0.3%). The experimentally determined formation constants of the complexes of C₇₀ with N-substituted anilines exhibit a very good linear free-energy relationship (Hammett, L. P. Chem. Rev. 1953, 53, 191).