Thermodynamic properties of fullerene C60 solutions in a mixture of tetrachloromethane and toluene |
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| Authors: | A. M. Kolker N. I. Islamova N. V. Avramenko A. V. Kozlov |
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| Affiliation: | (1) Institute of Solution Chemistry, Russian Academy of Sciences, Ivanovo, Russia;(2) Faculty of Chemistry, Moscow State University, Moscow, Russia |
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| Abstract: | The solubility of fullerene C60 in the tetrachloromethane-toluene system is measured over the entire range of compositions of the mixed solvent in the temperature range 298.15–338.15 K. An equation is proposed for describing the solubility of C60 as a function of the temperature and the composition of the mixed solvent. The equation is used for calculating the thermodynamic characteristics of solution of the fullerene. It is found that, in the investigated C60-CCl4/C6H5CH3 system, two types of solid solvates of the fullerene with the solvent are formed. The enthalpies and temperatures of incongruent melting of the crystalline solvates are determined by differential scanning calorimetry. The thermodynamic characteristics of solution and solvation of C60 in CCl4 and C6H5CH3 are obtained. It is shown that the entropy factor plays a decisive role in the temperature dependence of the Gibbs energy of solvation of the fullerene. |
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