To improve the understanding of the solution properties of C60 and C70 in aromatic solvents, binary systems
of C60 and C70 with benzene, toluene, 1,2- and 1,3-dimethylbenzene, 1,2,4- and 1,3,5-trimethylbenzene,
bromobenzene, and 1,2- and 1,3-dichlorobenzene were studied using differential scanning calorimetry, solution
calorimetry, and thermogravimetry. Solid solvates with different compositions were identified in many of the
systems. The solvates were characterized by composition and by the temperature and the enthalpy of the
incongruent melting transition. Enthalpies of solution of C60 in toluene, 1,2-dimethylbenzene, 1,2- and 1,3-dichlorobenzene, and 1,2,4-trimethylbenzene and of C70 in 1,2-dimethylbenzene and in 1,2- and 1,3-dichlorobenzene were determined. The formation−incongruent melting of solid solvates causes maxima in
the temperature−solubility curves of fullerenes in aromatic solvents. Trends in solubility behavior of fullerenes
were discussed in terms of thermodynamics of solution and solvate formation.