Heat Capacity and Standard Thermodynamic Functions of Triphenylantimony Bis(1-adamantanecarboxylate) over the Range from (0 to 520) K

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• 作者：Irina A. Letyanina ; Alexey V. Markin ; Natalia N. Smirnova ; Semen S. Sologubov ; Vladimir V. Sharutin
• 刊名：Journal of Chemical & Engineering Data
• 出版年：2013
• 出版时间：November 14, 2013
• 年：2013
• 卷：58
• 期：11
• 页码：3087-3095
• 全文大小：289K
• 年卷期：v.58,no.11(November 14, 2013)
• ISSN：1520-5134

文摘

Heat capacities of triphenylantimony bis(1-adamantanecarboxylate) Ph₃Sb[OC(O)C₁₀H₁₅]₂ were measured with a precision adiabatic vacuum calorimeter over the temperature range from T = (6 to 353) K and with differential scanning calorimeter over the temperature range from T = (320 to 520) K. The thermal behavior of the compound under study was investigated over the range from T = (250 to 530) K. It was revealed that triphenylantimony bis(1-adamantanecarboxylate) could exist in crystalline, liquid, glassy, and overcooled liquid states. On the obtained data, the standard thermodynamic functions of molar heat capacity C_p,m, enthalpy H(T) 鈥?H(0), entropy S(T), and Gibbs energy G(T) 鈥?H(0) of Ph₃Sb[OC(O)C₁₀H₁₅]₂ were calculated over the range from T = (0 to 498) K. The low-temperature (T < 50 K) heat capacity dependence was analyzed on the basis of Debye鈥檚 heat capacity theory of solids and its multifractal model, so the characteristic temperature and the fractal dimension were determined, and chain-layered structure topology was established. The standard entropy of formation at T = 298.15 K of Ph₃Sb[OC(O)C₁₀H₁₅]₂ (cr) 螖_fS_m(298.15, Ph₃Sb[OC(O)C₁₀H₁₅]₂, cr) = (鈭?885 卤 8) J路K^鈥?路mol^鈥? was calculated. Some thermodynamic properties of triphenylantimony bis(1-adamantanecarboxylate) were compared with similar data of other organic derivatives of antimony(V) studied earlier.