Solubility and partial specific volumes of C-60 and C-70

The solubility and partial specific volumes (v) of C-60 and C-70 in toluene and carbon disulfide solutions are investigated through precise measurements on the densities and the concentration dependence of the UV-vis absorption spectra. An anomalously large solubility (10.16 mg/ml) has been obtained for C-70 in carbon disulfide solution at 25 degrees C. The results are interpreted within the framework of the preferential cluster (aggregate) formation of C-70 in solution. Furthermore, the obtained v value gives an effective diameter of 10.42 Angstrom for C-60 which is in excellent agreement with the known van der Waals diameter of C-60 (10.34 Angstrom).