Low-temperature heat capacities and standard molar enthalpy of formation of pyridine-2,6-dicarboxylic acid

doi:10.1088/1674-1056/19/6/060517

中国物理B ›› 2010, Vol. 19 ›› Issue (6): 60517-060517.doi: 10.1088/1674-1056/19/6/060517

Low-temperature heat capacities and standard molar enthalpy of formation of pyridine-2,6-dicarboxylic acid

杨伟伟¹, 邸友莹¹, 孔玉霞¹, 谭志诚²

(1)College of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng 252059, China; (2)Thermochemistry Laboratory, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China

收稿日期:2009-10-26 出版日期:2010-06-15 发布日期:2010-06-15
基金资助:
Project supported by the National Natural Science Foundations of China (Grant Nos.~20673050 and 20973089).

Low-temperature heat capacities and standard molar enthalpy of formation of pyridine-2,6-dicarboxylic acid

Yang Wei-Wei(杨伟伟)^a), Di You-Ying(邸友莹)^a)†, Kong Yu-Xia(孔玉霞)^a), and Tan Zhi-Cheng(谭志诚)^b)

^a College of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng 252059, China; ^b Thermochemistry Laboratory, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China

Received:2009-10-26 Online:2010-06-15 Published:2010-06-15
Supported by:
Project supported by the National Natural Science Foundations of China (Grant Nos.~20673050 and 20973089).

摘要/Abstract

摘要： This paper reports that the low-temperature heat capacities of pyridine-2,6-dicarboxylic acid were measured by a precision automatic calorimeter over a temperature range from 78~K to 380~K. A polynomial equation of heat capacities as a function of temperature was fitted by the 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 intervals of 5~K. The constant-volume energy of combustion of the compound was determined by means of a precision rotating-bomb combustion calorimeter. The standard molar enthalpy of combustion of the compound was derived from the constant-volume energy of combustion. The standard molar enthalpy of formation of the compound was calculated from a combination of the datum of the standard molar enthalpy of combustion of the compound with other auxiliary thermodynamic quantities through a Hess thermochemical cycle.

Abstract: This paper reports that the low-temperature heat capacities of pyridine-2,6-dicarboxylic acid were measured by a precision automatic calorimeter over a temperature range from 78~K to 380~K. A polynomial equation of heat capacities as a function of temperature was fitted by the 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 intervals of 5~K. The constant-volume energy of combustion of the compound was determined by means of a precision rotating-bomb combustion calorimeter. The standard molar enthalpy of combustion of the compound was derived from the constant-volume energy of combustion. The standard molar enthalpy of formation of the compound was calculated from a combination of the datum of the standard molar enthalpy of combustion of the compound with other auxiliary thermodynamic quantities through a Hess thermochemical cycle.

Key words: pyridine-2, 6-dicarboxylic acid, adiabatic calorimetry, low-temperature heat capacity, standard molar enthalpy of formation

中图分类号: (Other thermodynamical quantities)

65.40.G-

82.60.Cx (Enthalpies of combustion, reaction, and formation)

杨伟伟, 邸友莹, 孔玉霞, 谭志诚. Low-temperature heat capacities and standard molar enthalpy of formation of pyridine-2,6-dicarboxylic acid[J]. 中国物理B, 2010, 19(6): 60517-060517.

Yang Wei-Wei(杨伟伟), Di You-Ying(邸友莹), Kong Yu-Xia(孔玉霞), and Tan Zhi-Cheng(谭志诚). Low-temperature heat capacities and standard molar enthalpy of formation of pyridine-2,6-dicarboxylic acid[J]. Chin. Phys. B, 2010, 19(6): 60517-060517.

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Low-temperature heat capacities and standard molar enthalpy of formation of pyridine-2,6-dicarboxylic acid

Low-temperature heat capacities and standard molar enthalpy of formation of pyridine-2,6-dicarboxylic acid

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