Acta Chimica Sinica ›› 2003, Vol. 61 ›› Issue (12): 1897-1903. Previous Articles     Next Articles

2-氨基-4,6-二甲氧基嘧啶的低温热容和热力学性质研究

孙晓红;宋纪蓉;谭志诚;邸友莹;马海霞;王美涵;孙立贤   

  1. 西北大学化工学院化学研究所;中国科学院
  • 出版日期:2003-12-15 发布日期:2003-12-15

Low-Temperature Heat Capacity and Thermodynamic Properties of 2- Amino-4, 6-dimethoxypyrimidine

Sun Xiaohong;Song Jirong;Tan Zhicheng;Di Youying;Ma Haixia;Wang Meihan;Sun Lixian   

  1. Chemical Research Institute, Chemical Engineering College, Northwest University;Thermochemistry Laboratory, Dalian Institute of Chemical Physics, Chinese Academy of Sciences
  • Online:2003-12-15 Published:2003-12-15

The low-temperature heat capacities of 2-amino-4, 6- dimethoxypyrimidine (C6H9N3O2) were precisely measured by an automated adiabatic calorimeter in the temperature range of 78 to 394 K. The sample was observed to melt at (370.97 ±0.02) K. On the basis of the heat-capacity measurements, the molar enthalpy and entropy of the phase transition as well as chemical purity of the substance were determined to be (29853.91 ± 9.25) J·mol~(-1), (80.45 ± 0.03) J· mol~(-1)·K~(-1) and 99.84%, respectively. The thermodynamic function of the compound were derived and reported at an interval of 5 K. The further research of the melting process for this compound has been carried out by means of DSC technique. The result was in agreement with that obtained from the measurements of heat capacities.

Key words: PYRIMIDINE P, THERMODYNAMIC PROPERTIES, DSC, PHASE TRANSFORMATION

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