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有机化学
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有机化学 ›› 2004, Vol. 24 ›› Issue (4): 409-413. 上一篇    下一篇

研究论文

4,6-二甲基-N-苯基-2-嘧啶胺的低温热容和热力学性质

孙晓红a, 宋纪蓉*,a, 谭志诚b, 邸友莹b, 王美涵b, 马海霞a, 王慧芳a, 孙立贤b   

  1. a西北大学化工学院 化学研究所 西安 710069
    b中国科学院大连化学物理研究所热化学实验室 大连 116023
  • 收稿日期:2003-07-07 修回日期:2003-09-08 接受日期:2003-10-16 发布日期:2022-09-19
  • 基金资助:
    国家自然科学基金(No. 20073047)和陕西省自然科学基金(No. 2001H11)资助项目

Low-Temperature Heat Capacity and Thermodynamic Properties of 4,6-Dimethyl-N-phenyl-2-pyrimidinamine

SUN, Xiao-Honga, SONG, Ji-Rong*,a, TAN, Zhi-Chengb, DI, You-Yingb, WANG, Mei-Hanb, Ma, Hai-Xiaa, Wang, Hui-Fanga, SUN, Li-Xianb   

  1. aCollege of Chemical Engineering, Chemical Research Institute, Northwest University, Xi'an 710069
    bThermochemistry Laboratory, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023
  • Received:2003-07-07 Revised:2003-09-08 Accepted:2003-10-16 Published:2022-09-19
  • Contact: *E-mail: xhsun888@yahoo.com.cn

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通过小样品精密自动绝热量热计测定了合成并提纯的4,6-二甲基-N-苯基-2-嘧啶胺(嘧霉胺)在78～391 K温区的摩尔热容.量热实验发现,该化合物在363～372K温区,有一固-液熔化相变过程,经三次重复测量,得其熔化温度、摩尔熔化焓及摩尔熔化熵分别为:(370.78±0.08) K, (21.233±0.013) kJ·mol-1和(57.27±0.15) J·mol-1·K-1.通过分步熔化法得到该物质绝对纯样品的熔点为371.031K.用差示扫描量热(DSC)技术对该物质的固-液熔化过程作了进一步研究,结果与绝热量热法一致.

关键词: 4,6-二甲基-N-苯基-2-嘧啶胺, 热容, 熔化焓, 绝热量热法, DSC

Low-temperature heat capacity of 4,6-dimethyl-N-phenyl-2-pyrimidinamine was precisely measured with a precision adiabatic calorimeter in the temperature range of 78～391 K. The sample melted at (370.78±0.08) K. The molar enthalpy and entropy of fusion were determined to be (21.233±0.013) kJ·mol-1 and (57.27±0.15) J·mol-1·K-1, respectively. Further researchof thermalproperty forthis compound was carried out by the DSC technique. The result was in agreementwith that obtained from adiabatic calorimetry.

Key words: 4,6-dimethyl-N-phenyl-2-pyrimidinamine, heat capacity, enthalpy of fusion, adiabatic calorimetry, DSC