Binary systems of C60 with positional isomers 1,2- and 1,3-C6H4Br2

Thermodynamic properties of binary systems of C₆₀ with 1,2- and 1,3-dibromobenzenes have been studied by means of differential scanning calorimetry (DSC). Solid solvates with the compositions C₆₀3(1,2-C₆H₄Br₂); C₆₀2(1,3-C₆H₄Br₂) and C₆₀0.6(1,3-C₆H₄Br₂) have been found. The solvates have been characterised by their enthalpies and temperatures of incongruent melting transition and in part by X-ray powder data. It has been shown that positional isomers 1,2- and 1,3- of the substituted benzenes formed two series of “typical” phase diagrams. Solubility behaviour of C₆₀ in positional isomers has been discussed.