Acta Phys. -Chim. Sin. ›› 2004, Vol. 20 ›› Issue (12): 1469-1471.doi: 10.3866/PKU.WHXB20041214

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The Standard Molar Enthalpy of Formation of Room Temperature Ionic Liquid EMIES

Zhang Zhi-Heng; Guan Wei; Yang Jia-Zhen; Tan Zhi-Cheng; Sun Li-Xian   

  1. Department of Chemistry, Liaoning University, Shenyang　110036; 1Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian　116023
  • Received:2004-04-02 Revised:2004-07-27 Published:2004-12-15
  • Contact: Yang Jia-Zhen E-mail:jzyanglnu@yahoo.com.cn

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Abstract: Using RBC-Ⅱ type oxygen-bomb combustion calorimeter, the molar combustion enthalpies of room temperature ionic liquid, 1-ethyl-3-methylimidazolium ethyl sulfate (EMIES), and 1-methylimidazole were determined at T=(298.15±0.01) K. For EMIES =(－2671±2) kJ·mol－1 and for 1-methylimidazole (－286.3±0.5) kJ·mol－1, respectively. The standard formation enthalpies were calculated to be (－3060±3) kJ·mol－1 for EMIES and (－2145±4) kJ·mol－1 for 1-methylimidazole. The reaction: ＋ (C2H5)2SO4 → [ ＋ C2H5OSO3－ ](l) is strong exothermic and its reaction heat, , was determined to be (－102.3±1.0) kJ·mol－1. The standard formation enthalpy of EMIES, ΔfHT, at different temperatures was calculated on the basis of the heat capacity data of EMIES.

Key words: Ionic liquid, 　Oxygen-bomb combustion calorimeter, 　EMIES, 　Standard molar enthalpy of combustion, 　Standard molar enthalpy of formation