Studying of the Basicity of Ionic Liquids by Potentiometric Titration

被引：10

作者：

Chen Xuewei ^{[1
]}

Song Hongbing ^{[1
]}

Chen Peng ^{[1
]}

Wang Furong ^{[1
]}

Qian Yu ^{[1
]}

Li Xuehui ^{[1
]}

机构：

[1] S China Univ Technol, Sch Chem & Chem Engn, State Key Lab Pulp & Paper Engn, Guangzhou 510640, Guangdong, Peoples R China

来源：

ACTA CHIMICA SINICA | 2012年 / 70卷 / 06期

基金：

中国国家自然科学基金;

关键词：

basic ionic liquids; basic strength; potentiometric titration; pK(b); basicity-structure relation;

D O I：

10.6023/A1108223

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

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 pK(b) 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 pK(b) 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.

引用

页码：770 / 774

页数：5