Synthesis and Characterization of Novel Brønsted-Lewis Acidic Ionic Liquids

DOI: 10.4236/gsc.2013.32A005   PDF   HTML     5,319 Downloads   9,156 Views   Citations


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.

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H. An, L. Kang, W. Gao, X. Zhao and Y. Wang, "Synthesis and Characterization of Novel Brønsted-Lewis Acidic Ionic Liquids," Green and Sustainable Chemistry, Vol. 3 No. 2A, 2013, pp. 32-37. doi: 10.4236/gsc.2013.32A005.

Conflicts of Interest

The authors declare no conflicts of interest.


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