电位滴定法研究离子液体的碱性

doi:10.6023/A1108223

化学学报 ›› 2012, Vol. 70 ›› Issue (06): 770-774.DOI: 10.6023/A1108223 上一篇下一篇

研究论文

电位滴定法研究离子液体的碱性

陈学伟, 宋红兵, 陈鹏, 王芙蓉, 钱宇, 李雪辉

华南理工大学化学与化工学院制浆造纸工程国家重点实验室广州 510640

投稿日期:2011-08-25 修回日期:2011-12-02 发布日期:2012-02-14
通讯作者: 李雪辉
基金资助:
国家自然科学基金(Nos. 20876055, 20906029)资助项目.

Studying of the Basicity of Ionic Liquids by Potentiometric Titration

Chen Xuewei, Song Hongbing, Chen Peng, Wang Furong, Qian Yu, Li Xuehui

School of Chemistry and Chemical Engineering, State Key Laboratory of Pulp & Paper Engineering, South China University of Technology, Guangzhou 510640

Received:2011-08-25 Revised:2011-12-02 Published:2012-02-14
Supported by:
Project supported by the National Natural Science Foundation of China (Nos. 20876055, 20906029).

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摘要/Abstract

近年来碱性离子液体的设计、合成及应用获得广泛关注. 离子液体碱性表征对于碱性离子液体的应用具有重要意义. 然而, 关于碱性离子液体碱性表征深入研究的报道还比较少. 我们合成了系列碱性离子液体, 利用电位滴定法测定了碱性离子液体的pK_b值, 通过相应pK_b值来表征离子液体的碱性强度, 最后考察了离子液体碱性与其结构之间的关联关系. 结果表明, 羧酸根碱性离子液体的碱性主要由阴离子决定, 但不同的阳离子也会影响到其碱性强度, 从而对离子液体的碱性进行微调; 对于胺基功能化的咪唑型离子液体, 由于离子液体结构中咪唑阳离子具有较强的吸电子诱导效应, 相对于对应的三乙胺其碱性显著下降.

关键词: 碱性离子液体, 碱性强度, 电位滴定, pK_b, 碱性-结构关系

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.

Key words: basic ionic liquids, basic strength, potentiometric titration, pK_b, basicity-structure relation

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陈学伟, 宋红兵, 陈鹏, 王芙蓉, 钱宇, 李雪辉. 电位滴定法研究离子液体的碱性[J]. 化学学报, 2012, 70(06): 770-774.

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.

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电位滴定法研究离子液体的碱性

Studying of the Basicity of Ionic Liquids by Potentiometric Titration

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