Abstract
In the present work, firstly the temperature dependence of heat capacity C p ,m ∘ = f ( T ) of the crystalline fullerene complex [(Me 3Si) 3C 60] 2 has been measured between T = (6 and 350) K and T = (330 and 480) K by precision adiabatic vacuum and dynamic calorimetry, respectively. The irreversible endothermic effect was detected in the temperature range from T = (400 to 466) K and its thermodynamic characteristics have been determined and analysed. This transformation was caused by the opening of a dimeric bond between fullerene fragments and the decomposition of the tested complex on heating. The experimental data were used for calculating the standard ( p ∘ = 0.1 MPa) thermodynamic functions C p ,m ∘ / R , Δ 0 T H m ∘ / RT , Δ 0 T S m ∘ / R and Φ m ∘ / R = Δ 0 T S m ∘ / R - Δ 0 T H m ∘ / RT (where R is gas constant) in the range 0 ⩽ T/K ⩽ 400. The value of the standard entropy of formation of the complex from simple substances at T = 298.15 K has been estimated.
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