Special Topic

Studying of the Basicity of Ionic Liquids by Potentiometric Titration

  • Chen Xuewei ,
  • Song Hongbing ,
  • Chen Peng ,
  • Wang Furong ,
  • Qian Yu ,
  • Li Xuehui
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  • School of Chemistry and Chemical Engineering, State Key Laboratory of Pulp & Paper Engineering, South China University of Technology, Guangzhou 510640

Received date: 2011-08-25

  Revised date: 2011-12-02

  Online published: 2012-02-14

Supported by

Project supported by the National Natural Science Foundation of China (Nos. 20876055, 20906029).

Abstract

Design, synthesis and application of basic ionic liquids have attracted much extensive interest in recent years. The determination of the basic strength is of crucial significance for the utilization of basic ionic liquids. However, studies on the basicity characterization were rarely reported for basic ionic liquids to the best of our knowledge. In this paper, the acid-dissociation constant pKb values of a series of basic ionic liquids synthesized were determined by potentiometric titration method. Then, the basicity of these ionic liquids was characterized by comparison of their pKb values. Finally, the relationship between the basicity and structure of these ionic liquids was discussed. The results show that the basicity of carboxylate ionic liquids is determined mainly by their anions, whereas the different cation is able to have its basicity finely tuned. The results also show that the basicity of amino-functionalized imidazolium ionic liquid is weaker than that of triethylamine due to the strong electron withdrawing effect of the positively charged imidazolium ring.

Cite this article

Chen Xuewei , Song Hongbing , Chen Peng , Wang Furong , Qian Yu , Li Xuehui . Studying of the Basicity of Ionic Liquids by Potentiometric Titration[J]. Acta Chimica Sinica, 2012 , 70(06) : 770 -774 . DOI: 10.6023/A1108223

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