Synthesis and Characterization of Novel Brønsted-Lewis Acidic Ionic Liquids

• 作者: Hualiang An Lijuan Kang Wei Gao Xinqiang Zhao Yanji Wang
• 来源期刊: 绿色与可持续化学(英文)
• 学科: 化学
• 关键词: Br?nsted-Lewis ACIDIC IONIC Liquids SYNTHESIS CHARACTERIZATION
• 年，卷（期）: 2013,（2）
• 页码范围: 32-37
• 页数: 6页
• 分类号: O6

摘要

To meet the demands of some kinds of reactions catalyzed simultaneously by Br?nsted acid and Lewis acid catalyst, two novel Br?nsted-Lewis acidic ionic liquids, 1-carboxyethylene-3-(4-zinc acetate sulfobutyl) imidazolium chloride ([CH3COO-Zn-O3S-bim-CH2CH2COOH]Cl) and 1-(1,2-dicarboxy) ethylene-3-(4-zinc acetate sulfobutyl) imidazolium chloride ([CH3COO-Zn-O3S-bim-C4H5O4]Cl) were synthesized, in which both Br?nsted and Lewis acidic sites existed in the cation. The structures of the ionic liquids were determined by means of FT-IR, 1H NMR and elemental analysis. The results of Py-IR analysis indicated that the two novel ionic liquids have both Br?nsted and Lewis acid properties. The acid strength values (H0) of the ionic liquids were measured utilizing the UV-visible spectroscopy combined with Hammett indicator method, and the acid amount of them was determined by acid-base titration.