Thermochemistry of inosine

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• 作者：Juliana A. Boerio-Goates ; Sarah D. Hopkins ; Ricardo A.R. Monteiro ; Maria D.M.C. Ribeiro da Silva ; Manuel A.V. Ribeiro da Silva and Robert N. Goldberg
• 关键词：Enthalpy of combustion ; Enthalpy of formation ; Entropy ; Heat capacity ; Inosine ; Inosine 5′ ; -triphosphate ; ITP ; Standard transformed formation properties
• 刊名：Journal of Chemical Thermodynamics
• 出版年：2005
• 期刊代码：123_00219614
• 类别：ch
• 出版时间：2005
• 卷：37
• 期：11
• 页码：1239-1249
• 文件大小：244 K

摘要

The formation thermodynamic properties of crystalline and aqueous inosine have been determined by using a combination of calorimetric techniques. Oxygen bomb calorimetric measurements on crystalline inosine yielded a standard molar enthalpy of combustion of . From this, a value for the standard molar enthalpy of formation of −(847.9 ± 4.7) kJ · mol⁻¹ was obtained. The standard molar heat capacity of crystalline inosine has been measured over the temperature interval 11 T/K 325 by using an adiabatic calorimeter. The heat capacities were fit to a series of polynomials from which smoothed values for the standard thermal properties were calculated for 20 T/K 320. The standard molar entropy at T = 298.15 K is (288.0 ± 0.6) J · K⁻¹ · mol⁻¹ and the standard molar entropy of formation is −(1449.6 ± 0.6) J · K⁻¹ · mol⁻¹. The standard Gibbs free energy of formation . By using literature values of the standard molar enthalpy of solution and the saturation molality of inosine(cr), the standard molar thermodynamic properties of aqueous inosine at T = 298.15 K are found to be ; ; and . These results are used to calculate standard thermodynamic properties of various aqueous species involving inosine.