SPECTROPHOTOMETRIC STUDIES OF COMPLEXATION OF C-60 WITH AROMATIC-HYDROCARBONS

The equilibrium constants For complexation of C-60 with naphthalene, p henanthrene and pyrene in toluene have been determined by UV/visible s pectroscopy. The magnitude of the equilibrium constants was found to i ncrease with decreasing ionization potential of the donor. Values for complexation enthalpy have been determined for the first time for C-60 /aromatic hydrocarbons. Well-defined charge transfer (C-T) bands have been observed for complexes of C-60 with a variety of aromatic hydroca rbons, with C-T band maxima moving to higher frequency with increasing donor ionization potential. (C) 1997 Elsevier Science B.V.