Acta Chimica Sinica ›› 2010, Vol. 68 ›› Issue (03): 227-232. Previous Articles     Next Articles

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  1. (1滨州医学院化学教研室 烟台 264003)
    (2中国科学院大连化学物理研究所 热化学实验室和中国离子液体实验室 大连 116023)
    (3山东农业大学化学与材料科学学院 泰安 271018)
  • 收稿日期:2009-02-12 修回日期:2009-06-20 出版日期:2010-02-14 发布日期:2010-02-20
  • 通讯作者: 谭志诚
  • 基金资助:

    NSFC No 20373072;20753002

Low-temperature Heat Capacity and Thermodynamic Properties of 2-Thiopheneacetic Acid

Gao Zonghua1 Shi Quan2 Tan Zhicheng*,2 Lan Xiaozheng3   

  1. (1 Department of Chemistry, Binzhou Medical College, Yantai 264003)
    (2 Thermochemistry Laboratory and China Ionic Liquid Laboratory, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023)
    (3 College of Chemistry and Materials Science, Shandong Agricultural University, Tai'an 271018)
  • Received:2009-02-12 Revised:2009-06-20 Online:2010-02-14 Published:2010-02-20

The low-temperature heat capacity of 2-thiopheneacetic acid was measured in the temperature range from 78 to 343 K with a high precision automated adiabatic calorimeter. No phase transition or other thermal anomaly was observed in the temperature ranges of 78~314 and 337~343 K, in which the molar heat capacities were fitted to two polynomials by means of the least square fitting. A solid-liquid phase transition was observed in the temperature range of 314~337 K. The melting point, molar enthalpy and entropy of fusion, and molar purity of this compound were determined to be 335.745 K, 16.260 kJ•mol-1, 48.415 J•K-1•mol-1 and 98.56%, respectively. The thermodynamic functions of 2-thiopheneacetic acid relative to the reference temperature 298.15 K were derived based on the heat capacity data in the temperature range of 80~340 K.

Key words: 2-thiopheneacetic acid, adiabatic calorimetry, heat capacity, thermodynamic function

CLC Number: