Low-Temperature Heat Capacities and Standard Molar Enthalpy of Formation of Gramine （C11H14N2）
Low-Temperature Heat Capacities and Standard Molar Enthalpy of Formation of Gramine （C11H14N2）作者机构：Department of Chemistry and Chemical Engineering Shaanxi Institute of Education Xi＇an Shaanxi 710061 China College of Chemistry and Chemical Engineering Liaocheng University Liaocheng Shandong 252059 China Thermochemistry Laboratory Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian Liaoning 116023 China
出 版 物：《Chinese Journal of Chemistry》 (中国化学（英文版）)
年 卷 期：2011年第29卷第11期
页 面：2278-2284页
核心收录：
学科分类：1007[医学-药学(可授医学、理学学位)] 081704[工学-应用化学] 07[理学] 08[工学] 0817[工学-化学工程与技术] 0703[理学-化学] 070301[理学-无机化学] 10[医学]
基 金：Project supported by the National Natural Science Foundations of China (Nos. 20673050 20973089) the Natural Science Foundation of Shaanx Province (No. 2009JM2014) Key Project of Science Foundation from Shaanxi Educational College (No. 10KJ006) and Research Project of Natura Sciences from Educational Department of Shaanxi Province (No. 2010JK416)
主 题：alkaloids adiabatic calorimetry low-temperature heat capacity oxygen-bomb combustion calorimetry standard molar enthalpy of formation thermodynamics
摘 要：Low-temperature heat capacities of gramine （C11H14N2） were measured by a precision automated adiabatic calorimeter over the temperature range from 78 to 401 K. A polynomial equation of heat capacities as a function of temperature was fitted by least squares method. Based on the fitted polynomial, the smoothed heat capacities and thermodynamic functions of the compound relative to the standard reference temperature 298.15 K were calculated and tabulated at 5 K intervals. The constant-volume energy of combustion of the compound at T=298.15 K was measured by a precision oxygen-bomb combustion calorimeter as △cU=-（35336.7±13.9） j·g^-1. The standard molar enthalpy of combustion of the compound was determined to be △cHm=-（6163.2±2.4） kJ·mol^-1, according to the definition of combustion enthalpy. Finally, the standard molar enthalpy of formation of the compound was calculated to be △cHm=-（166.2±2.8） kJ·mol-1 in accordance with Hess law.
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