Low-Temperature Heat Capacity and Standard Thermodynamic Functions of Li12C60(THF)1.4 Fulleride

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• 作者：Alexey V. Markin ; Natalia N. Smirnova ; Elena A. Gorina ; Sophia N. Titova ; Anatoly M. Obé ; dkov ; Georgy A. Domrachev
• 刊名：Journal of Chemical & Engineering Data
• 出版年：2009
• 出版时间：June 11, 2009
• 年：2009
• 卷：54
• 期：6
• 页码：1680-1684
• 全文大小：118K
• 年卷期：v.54,no.6(June 11, 2009)
• ISSN：1520-5134

文摘

Low-temperature heat capacities of the crystalline coordination compound Li₁₂C₆₀(THF)_1.4 have been measured by a precision adiabatic calorimeter over the temperature range T = 6 K to T = 350 K and by a differential scanning calorimeter over the temperature range T = 330 K to T = 520 K for the first time. Using the obtained data, the temperature of the onset of Li₁₂C₆₀(THF)_1.4 destruction was determined to be 468 K. The experimental results have been used to calculate the standard (p^o = 0.1 MPa) thermodynamic functions: molar heat capacities C_p,m^o, enthalpy H^o(T) − H^o(0), entropy S^o(T), and Gibbs energy G^o(T) − H^o(0) of Li₁₂C₆₀(THF)_1.4 (cr) over the range from T → 0 K to T = 468 K. The low-temperature (T < 50 K) dependence of the heat capacity was analyzed based on Debye’s heat capacity theory of solids and its fractal variant. As results, the characteristic temperatures as well as the fractal dimension were determined, and some conclusions about structure topology are given. The standard entropy of formation at T = 298.15 K of Li₁₂C₆₀(THF)_1.4 (cr) was calculated. The standard thermodynamic properties of tested fulleride and previously studied C₆₀ fullerite and hydrofullerene C₆₀H₃₆ were compared.