Thermodynamic and thermal properties of the C60-l-lysine derivative

In the present research, the low-temperature molar heat capacity, Cp,m°, of C60 - l-lysine derivative was measured using adiabatic calorimetry from T = 13 K to T = 326 K. The respective molar third law entropy at T = 298.15 K, Sm°, was calculated giving (1110 ± 3) J·K−1·mol−1 for C60 - l-lysine derivative. Smoothed Cp,m°(T) values between T → 0 K and 320 K are presented along with the values for Sm° and the functions [Hm°(T) - Hm°(0)] and [Gm°(T) - Hm°(0)]. The standard molar entropy of formation, ΔfSm°, at T = 298.15 K was calculated for the compound under study in the crystalline state giving −1916 ± 5 J·K−1·mol−1. The complex thermal analysis of the C60-Lys crystallohydrate was performed from T = 300 to T = 1323 K.