A detailed spectrophotometric and thermodynamic studies have been carried out to look insight into the nature of molecular interactions of the electron donor-acceptor complexes of [60]fullerene with a series of anisoles, e.g., anisole, m-bromoanisole and p-bromoanisole. An absorption band due to charge transfer (CT) transition is observed in the visible region. A new theoretical model has been developed which takes into account the interaction between electronic subsystems of [60]fullerene and anisoles. Formation constants of the complexes were determined at four different temperatures from which enthalpies and entropies of formation of the complexes were estimated. (C) 2004 Elsevier B.V. All rights reserved.