Thermochemistry of Fullerene C₆₀ Solutions in Toluene, o-Xylene and o-Dichlorobenzene

In hermetic highly sensitive calorimeter with an isothermal shell, the enthalpies of dissolution of fullerene C₆₀ in toluene, o-xylene and o-dichlorobenzene were measured at temperatures of 288.15 K and 308.15 K at various concentrations of the dissolved substance. On the basis of the measured values and literature data, standard thermodynamic functions of the dissolution of C₆₀ in the above mentioned solvents have been found at the indicated temperatures. The fact of the change in the sign of the dissolution enthalpy for all three systems under study at a transition to a temperature of 308.15 K has been revealed. A negative value of the dissolution entropy indicates the presence of a constant interaction in these liquid systems, which decreases sharply at 308.15 K

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