化学学报 ›› 2000, Vol. 58 ›› Issue (11): 1380-1385. 上一篇    下一篇

研究论文

2-碘-3-硝基甲苯的低温热容和热力学性质

邸友莹;李爽;孟霜鹤;谭志诚;屈松生   

  1. 武汉大学化学与环境科学学院;中国科学院大连化学物理研究所热化学实验室
  • 出版日期:2000-11-15 发布日期:2000-11-15

Low-temperature heat capacity and thermodynamic properties of 2-iodo- 3-nitrotoluene

Di Youying;Li Shuang;Meng Shuanghe;Tan Zhicheng;Qu Songsheng   

  • Online:2000-11-15 Published:2000-11-15

通过精密自动绝热热量计测定了2-碘-3-硝基甲苯(C~7H~6INO~2)在79~373K温区的摩尔热容。实验结果表明,这个化合物在331~340K温度区间有一个固-液熔化相变,其熔化温度、摩尔熔化焓、摩尔熔化熵以及该样品的化学纯度分别为:(339.311±0.13)J·mol^-^1·K^-^1和99.73%。用热容多项式议程进行数值积分获得了该物质在298.15~370K温区每隔5K的热力学函数值。用DSC分析对它的固-液相变过程作了进一步的研究。

关键词: 甲苯P, 硝基苯P, 比热, 热力学性质, 示差扫描量热法

The heat capacity of 2-iodo-3-nitrotoluene was precisely determined with a small sample precision automated adiabatic calorimeter over the temperature range from 79 to 373K. A phase transition from solid to liquid was observed at the peak temperature of (339.311±0.035)K. The molar enthalpy and entropy of the phase transition as well as chemical urity of the substance were determined to be (20677.54±40. 09)J·mol^-^1, (61.04±0.13)J·mol^-^1·K^-^1 and 99.73%, respectively, on the basis of the heat-capacity measurements. the further research of solid-liquid phase transition for this compound were carried out by means of DSC technique.

Key words: METHYLBENZENE P, NITROBENZENE P, SPECIFIC HEAT, THERMODYNAMIC PROPERTIES, DIFFERENTIAL SCANNING CALORIMETRY

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