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化学学报
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化学学报 ›› 2008, Vol. 66 ›› Issue (4): 408-412. 上一篇    下一篇

研究论文

离子液体C3MIBF4和C5MIBF4溶解焓的研究

房大维1,2, 孙迎春1, 李吉广1, 王朕威1, 杨家振*,1   

  1. (1辽宁大学化学院 稀散元素研究所 沈阳 110036)
    (2中国科学院盐湖研究所 西宁 810008)
  • 投稿日期:2007-06-27 修回日期:2007-09-10 发布日期:2008-02-28
  • 通讯作者: 杨家振

Study on Solution Enthalpies of Ionic Liquids of C3MIBF4 and C5MIBF4

FANG Da-Wei1,2; SUN Ying-Chun1; LI Ji-Guang1; WANG Zhen-Wei1; YANG Jia-Zhen*,1   

  1. (1 College of Chemistry, Institute of Rare and Scattered Elements, Liaoning University, Shenyang 110036)
    (2 Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008)
  • Received:2007-06-27 Revised:2007-09-10 Published:2008-02-28
  • Contact: YANG Jia-Zhen

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在298.15 K下利用等温环境溶解反应热量计测定了离子液体C3MIBF4(四氟硼酸1-甲基-3-丙基咪唑)和C5MIBF4(四氟硼酸1-甲基-3-戊基咪唑)不同浓度水溶液的摩尔溶解焓(ΔsHm). 借助Pitzer电解质溶液理论, 得到了它们的标准摩尔溶解焓 和Pitzer焓参数: 和 , 并计算了表观相对摩尔焓. 根据Glasser理论计算了离子液体晶格能, 进而估算了离子液体C5MIBF4和C3MIBF4中正离子的水化焓分别为－171 kJ•mol－1 (C5MI＋)和－207 kJ•mol－1 (C3MI＋).

关键词: 离子液体, 等温环境溶解反应热量计, 溶解焓, Pitzer理论, 离子水化焓

The molar enthalpies of dissolution (ΔsHm) of ionic liquids C3MIBF4 (1-methyl-3-propylimida- zolium tetrafluoroborate) and C5MIBF4 (1-methyl-3-pentylimidazolium tetrafluoroborate) in water were determined by a solution-reaction isoperibol calorimeter at 298.15 K. According to Pitzer’s electrolyte solution theory, the standard molar enthalpy values of solutions of C3MIBF4 and C5MIBF4, and Pitzer parameters: and , were obtained, respectively. The hydration enthalpies of cations ΔH＋ in C5MIBF4 and C3MIBF4 estimated from Glasser’s theory of lattice energy were －171 and －207 kJ•mol－1, respectively.

Key words: ionic liquid, isoperibol calorimeter, solution enthalpy, Pitzer’s theory, hydration enthalpy of cation