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Heat capacity and standard molar enthalpy of formation of crystalline 2,6-dicarboxypyridine (C7H5NO4) |
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| Authors: | Quan Shi Zhi-Cheng Tan You-Ying Di Bo Tong Zhi-Heng Zhang Li-Xian Sun |
| Institution: | a Thermochemistry Laboratory, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China b Graduate School of the Chinese Academy of Sciences, Beijing 100049, China c College of Chemistry and Chemical Engineering, LiaoCheng University, LiaoCheng 252059, China |
| Abstract: | Low-temperature heat capacity Cp,m of 2,6-dicarboxypyridine (C7H5NO4; CAS 499-83-2) was precisely measured in the temperature range from (80 to 378) K with a high precision automated adiabatic calorimeter. No phase transition or thermal anomaly was observed in this range. The thermodynamic functions HT − H298.15] and ST − S298.15] were calculated in the range from (80 to 378) K. The standard molar enthalpy of combustion and the standard molar enthalpy of formation of the compound have been determined,  and  , by means of a precision oxygen-bomb combustion calorimeter at T = 298.15 K. The thermodynamic properties of the compound were further investigated through differential scanning calorimeter (DSC) and the thermogravimetric (TG) analysis. |
| Keywords: | 2 6-Dicarboxypyridine Heat capacity Thermodynamic function Adiabatic calorimetry Standard molar enthalpy of combustion Standard molar enthalpy of formation TG-DTA DSC |
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