The thermodynamic functions of fullerene derivative (t-Bu)12C60 over the temperature range from T → 0 to 420 K

The temperature dependence of heat capacity C (p) (o) = f(T) of fullerene derivative (t-Bu)(12)C-60 has been measured by a adiabatic vacuum calorimeter over the temperature range T = 6-350 K and by a differential scanning calorimeter over the temperature range T = 330-420 K for the first time. The low-temperature (T a parts per thousand currency sign 50 K) dependence of the heat capacity was analyzed based on Debye's the heat capacity theory of solids and its fractal variant. As a consequence, the conclusion about structure heterodynamicity is given. The experimental results have been used to calculate the standard thermodynamic functions C (p) (o) (T), H (o)(T)-H (o)(0), S (o)(T) and G (o)(T) - H (o)(0) over the range from T -> 0 to 420 K. The standard entropy of formation at 298.15 K of fullerene derivative under study was calculated. The temperature of decomposition onset of derivative was determined by differential scanning calorimetery and thermogravimetric analysis. The standard thermodynamic characteristics of (t-Bu)(12)C-60 and C-60 fullerite were compared.