物理化学学报 >> 2016, Vol. 32 >> Issue (11): 26632663-2670.doi: 10.3866/PKU.WHXB201607292

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基于离子交换跃迁模型和实验法对离子液体Walden乘积的研究

郑玲1,潘懿1,季宏祥1,马晓雪1,3,*(),邢楠楠1,关伟1,2,*()   

  1. 1 辽宁大学化学院,沈阳110036
    2 辽宁大学环境学院,沈阳110036
    3 中国科学院化学研究所,北京分子科学国家实验室,北京100190
  • 收稿日期:2016-06-14 发布日期:2016-11-08
  • 通讯作者: 马晓雪,关伟 E-mail:mxx_1985@163.com;guanweiy@sina.com
  • 基金资助:
    国家自然科学基金(21373104);国家自然科学基金(21273003);辽宁省高等学校优秀人才支持计划(LR2015025)

Evaluation of the Walden Product of Ionic Liquids Using Experiments and a New Theory: An Ion Exchange Transition Model

Ling ZHENG1,Yi PAN1,Hong-Xiang JI1,Xiao-Xue MA1,3,*(),Nan-Nan XING1,Wei GUAN1,2,*()   

  1. 1 College of Chemistry, Liaoning University, Shenyang 110036, P. R. China
    2 School of Environmental Science, Liaoning University, Shenyang 110036, P. R. China
    3 Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China
  • Received:2016-06-14 Published:2016-11-08
  • Contact: Xiao-Xue MA,Wei GUAN E-mail:mxx_1985@163.com;guanweiy@sina.com
  • Supported by:
    The project was supported by the National Natural Science Foundation of China(21373104);The project was supported by the National Natural Science Foundation of China(21273003);Program for Liaoning Excellent Talents in University, China(LR2015025)

摘要:

提出了关于离子液体的新理论——离子交换跃迁模型,通过理论推导得出1:1型离子液体的Walden乘积仅取决于离子对和离子簇直径的统计平均值,即离子液体的阴阳离子结构不同,Walden乘积不同。为了验证模型的正确性,本文合成8种N-烷基-吡啶二氰胺类和N-烷基-咪唑丝氨酸类离子液体,利用上述离子液体的电导率和动力粘度的实验值及文献数据,计算了33种离子液体的Walden乘积。通过比较发现,不同离子液体的Walden乘积不同,即对于离子液体来说,Walden乘积是它的特征物理量。

关键词: 离子液体, 电导率, 粘度, 跃迁模型, Walden乘积

Abstract:

A new theory has been developed to evaluate the Walden product, W, of ionic liquids using an ion exchange transition model. This model showed that the product (Walden) of molar conductivity and dynamic viscosity is related to the average diameters of the ion pairs and ion clusters of ionic liquids (ILs) with 1:1 charge ratios, namely, different ILs have different W values. Several experiments were conducted to evaluate the validity of this model. Eight different ILs, including five N-alkyl-pyridinium dicyanamide ILs[Cnpy] [DCA] (n=2-6) and three N-alkyl-3-methyllimidazolium serine ILs[Cnmim] [Ser] (n=2-4) were successfully synthesized and evaluated in terms of their conductivity and dynamic viscosity properties. The W values of 33 different ILs were calculated based on their experimentally determined molar conductivity and dynamic viscosity values, and the results revealed that these values were consistent with those of the ion exchange transition model. Taken together, these results demonstrate that W is a key physical parameter for ILs.

Key words: Ionic liquid, Conductivity, Viscosity, Transition model, Walden product

MSC2000: 

  • O642