Energies of charge transfer and formation equilibria of the complexes of [70]fullerene with some interesting polyaromatic molecules

Abstract

We have investigated electron donor–acceptor complexes of [70]fullerene with various polyaromatic molecules (PAM) with different vertical ionization potentials ( I D v ). Well defined charge transfer (CT) absorption bands have been located in the visible region. We extract degrees of charge transfer, oscillator and transition dipole strengths by analyzing the transition energy of the CT band as a function of I D v of the donors studied. The experimental results were explained using a theoretical model that takes into account the interaction between electronic subsystems of PAM with [70]fullerene. Trends in the formation constant for the [70]fullerene/PAM complexes were discussed in terms of enthalpies and entropies of formation.