Pressure dependence of the solubility of light fullerenes in 1-hexanol from 298.15Â K to 363.15Â K

The solubility of light fullerenes (C60 and C70) in 1-hexanol was investigated in the range of pressures of 0.1-100 MPa and in the range of temperatures of 298.15-363.15 K. In all of the studied temperatures, solubility increases monotonously with increasing pressure. At ambient pressure, we have found that the temperature dependence of solubility in the binary system C60-1-hexanol is non-monotonic: the solubility diagram consists of two branches corresponding to the crystallization of different solid phases and one invariant point corresponding to the simultaneous saturation of both phases (monosolvated fullerene C60 and non-solvated C60). The composition of the solid crystallosolvate was determined by thermogravimetric analysis. The solubility diagram of the binary system C70-1-hexanol in the temperature range of 298.15-328.15 K at 0.1 MPa consists of only one branch corresponding to the crystallization of non-solvated C70.