AbstractThe thermal decomposition of C60Br24•2Br2 has been studied by Differential Scanning Calorimetry (DSC) at different heating rates. Depending from the heating rate, the thermal decomposition peak occurred between 163 °C and 201 °C with an activation energy E# = 108.6 kJ/mol. The decomposition products are C60 (assessed by FT-IR) and molecular bromine. From the decomposition enthalpy measured by DSC, the enthalpy of formation ΔHf°(C60Br24(c)) = 2114 ± 34 kJ/mol has been determined. By group increment or group additivity method ΔHf°(C60Br24 (g)) = 2184 kJ/mol has been calculated, in fair agreement with the experimental value. Furthermore, through the group increment method ΔGf°(C60Br24 (g)) = 3264 kJ/mol has been estimated. The enthalpy of the C-Br bond in the C60Br24 molecule was found comprised between 108 and 120 kJ/mol.