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苯氧乙酸嘧霉胺盐的低温热容和热力学性质研究

孙晓红1; 刘源发2; 谭志诚3; 贾婴琦2; 王美涵3   

  1. 1. 西北大学化学研究所,
    2. 西北大学化学系, 西安 710069;
    3. 中国科学院大连化学物理研究所热化学研究室, 大连 116023
  • 收稿日期:2005-05-23 修回日期:1900-01-01 出版日期:2006-06-10 发布日期:2006-06-10
  • 通讯作者: 孙晓红

Heat Capacity and Thermodynamic Properties of Crystalline Pyrimethanil Phenoxyacetate(C20H21N3O3)

SUN Xiao-Hong1*; LIU Yuan-Fa2; TAN Zhi-Cheng3; JIA Ying-Qi2; WANG Mei-Han3   

  1. 1. Chemical Research Institute, Northwest University,
    2. Department of Chemistry, Northwest University, Xi'an 710069, China; 3. Thermochemistry Laboratory, Dalian Institute of Chemical Physics,
    Chinese Academy of Sciences, Dalian 116023, China
  • Received:2005-05-23 Revised:1900-01-01 Online:2006-06-10 Published:2006-06-10
  • Contact: SUN Xiao-Hong

摘要: 用精密自动绝热量热计测定了苯氧乙酸嘧霉胺盐在81-380 K之间的低温热容. 结果表明, 该化合物在81-328 K之间无相变和热异常现象发生, 在328-354 K之间发生固-液熔化, 其熔化温度、摩尔熔化焓和摩尔熔化熵分别为(349.38±0.03) K, (34.279±10) kJ/mol和(98.13±0.05) J/(K·mol). 根据热力学函数关系式计算出苯氧乙酸嘧霉胺盐在80-325 K之间以标准状态(298.15 K)为基准的热力学函数值.

关键词: 苯氧乙酸嘧霉胺盐, 热容, 热力学函数, 绝热量热法

Abstract: Low-temperature heat capacities of Pyrimethanil phenoxyacetate(C20H21N3O3) were precisely measured with a high-precision automated adiabatic calorimeter over the temperature range between 81 to 380 K. The compound was observed to melt at(349.38±0.04) K. The molar enthalpy ΔfusHm, and entropy of fusion, ΔfusSm of the compound were determined to be (34.279±10) J/mol, (98.13±0.05) J/(mol•K), respectively. The thermodynamic function data relative to the reference temperature(298.15 K) were calculated based on the heat capacities measurements in the temperature range from 80 K to 325 K.

Key words: Pyrimethanil phenoxyacetate, Heat capacity, Thermodynamic function, Adiabatic calorimetry

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