物理化学学报 >> 2013, Vol. 29 >> Issue (10): 2107-2113.doi: 10.3866/PKU.WHXB201304172

热分析动力学和热动力学 上一篇    下一篇

二元混合离子液体的电导率与离子间的缔合作用

宁汇, 侯民强, 杨德重, 康欣晨, 韩布兴   

  1. 中国科学院化学研究所, 中国科学院胶体界面与化学热力学重点实验室, 北京分子科学国家实验室, 北京 100190
  • 收稿日期:2013-02-15 修回日期:2013-04-16 发布日期:2013-09-26
  • 通讯作者: 韩布兴 E-mail:hanbx@iccas.ac.cn
  • 基金资助:

    国家自然科学基金(20903109, 21073207)资助项目

Ionic Association in Binary Ionic Liquids by Conductivity

NING Hui, HOU Min-Qiang, YANG De-Zhong, KANG Xin-Chen, HAN Bu-Xing   

  1. Institute of Chemistry, Chinese Academy of Sciences, CAS Key Laboratory of Colloid, Interface and Chemical Thermodynamics, Beijing National Laboratory for Molecular Sciences, Beijing 100190, P. R. China
  • Received:2013-02-15 Revised:2013-04-16 Published:2013-09-26
  • Contact: HAN Bu-Xing E-mail:hanbx@iccas.ac.cn
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (20903109, 21073207).

摘要:

在293.15-323.15 K范围内, 测定了13种常见离子液体及其25组混合体系的电导率. 利用Vogel-Tammann-Fulcher (VTF)方程对电导率数据进行拟合, 并通过方程式中的拟合参数分析了离子液体混合后其阴阳离子间缔合作用的变化规律. 结果表明,在相同温度下, 离子液体的阳离子侧链越短,阴离子电荷越分散, 阴阳离子间的氢键作用力越弱,离子液体的电导率越大, 其中阴离子的影响比阳离子更明显.混合离子液体中离子间的缔合作用不仅与阴阳离子的种类有关,而且与混合物的组成有关.

关键词: 离子液体, 二元混合, 电导率, 离子缔合, VTF方程

Abstract:

In this study, the conductivity of 13 ionic liquids (ILs) and 25 related binary mixtures were determined at temperatures ranging from 293.15-323.15 K. The conductivity data of the pure ILs and their mixtures were fitted using the Vogel-Tammann-Fulcher (VTF) equation. The ionic association in the ILs and IL mixtures was discussed using the parameters of the VTF equation. It was demonstrated that at the same temperature, the ILs with short side chain cations, low charge density anions, and weak hydrogen bonding force between cations and anions usually exhibited high conductivity. Anions had a more obvious effect on conductivity than cations. The ionic association in the mixtures was affected not only by the species but also by the composition of the mixture.

Key words: Ionic liquid, Binary mixture, Conductivity, Ionic association, VTF equation

MSC2000: 

  • O642