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
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.
Cite this paper
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. 2, 2013, pp. 32-37. doi: 10.4236/gsc.2013.32A005.
 L. J. Jia, Y. Y. Wang, H. Chen, Y. K. Shan and L. Y. Dai, “Alkylation of Benzene with 1-Hexene in Acidic Ionic Liquid Systems: Et3NHCl-FeCl3 and Et3NHCl-AlCl3 Io- nic Liquids,” Reaction Kinetics and Catalysis Letters, Vol. 86, No. 2, 2005, pp. 267-273.
 A. C. Cole, J. L. Jensen, I. Ntai, K. L. Tran, K. J. Weaver, D. C. Forbes and J. H. Davis Jr., “Novel Br?nsted Acidic Ionic Liquids and Their Use as Dual Solvent-Catalysts,” Journal of the American Chemical Society, Vol. 124, No. 21, 2002, pp. 5962-5963. doi:10.1021/ja026290w
 L. M. Liu, F. Li, Y. J. Wang and X. Q. Zhao, “One Step Synthesis of Methylene Diphenyl Dicarbamate,” Chinese Journal of Catalysis, Vol. 28, No. 8, 2007, pp. 667-669.
 X. H. Wang, G. H. Tao, Z. Y. Zhang and Y. Kou, “Synthesis and Characterization of Dual Acidic Ionic Liquids,” Chinese Chemical Letters, Vol. 16, No. 12, 2005, pp. 1563-1565.
 S. W. Liu, C. X. Xie, S. T. Yu and F. S. Liu, “Dimerization of rosin using Br?nsted-Lewis Acidic Ionic Liquid as Catalyst,” Catalysis Communication, Vol. 9, No. 10, 2008, pp. 2030-2034. doi:10.1016/j.catcom.2008.03.045
 S. W. Liu, H. X. Zhou, S. T. Yu, C. X. Xie, F. S. Liu and Z. Q. Song, “Dimerization of Fatty Acid Methyl Ester Using Bronsted-Lewis Acidic Ionic Liquid as Catalyst,” Chemical Engineering Journal, Vol. 174, No. 1, 2011, pp. 396-399. doi:10.1016/j.cej.2011.09.017
 S. W. Liu, C. X. Xie, S. T. Yu, M. Xian and F. S. Liu, “A Bronsted-Lewis Acidic Ionic Liquid: Its Synthesis and Use as the Catalyst in Rosin Dimerization,” Chinese Journal of Catalysis, Vol. 30, No. 5, 2009, pp. 401-406.
 S. T. Yu, S. W. Liu, F. S. Liu, C. X. Xie and K. H. Ji, “A Bronsted-Lewis Acidic Ionic Liquid and Its Application in the Reaction of Rosin Dimerization,” CN Patent No. 101191035 B, 2010.
 S. W. Liu, L. Li, S. T. Yu, C. X. Xie, F. S. Liu and Z. Q. Song, “Polymerization of Fatty Acid Methyl Ester Using Acidic Ionic Liquid as Catalyst,” Chinese Journal of Catalysis, Vol. 31, No. 11-12, 2010, pp. 1433-1438.
 N. N. Quan, S. H. Bao and J. G. Yang, “Highly Efficient Procedure for the Conjugate Addition of Amines to Electron-Deficient Alkenes Catalyzed by Novel Ionic Liquid,” Chinese Science Bulletin, Vol. 55, No. 23, 2010, pp. 2512-2516. doi:10.1007/s11434-010-3147-y
 X. Liang and C. Qi, “Synthesis of a Novel Ionic Liquid with both Lewis and Bronsted Acid Sites and Its Catalytic Activities,” Catalysis Communication, Vol. 12, No. 9, 2011, pp. 808-812. doi:10.1016/j.catcom.2011.01.018
 X. Jiang, W. Ye, X. Song, W. Ma, X. Lao and R. Shen, “Novel Ionic Liquid with both Lewis and Bronsted Acid Sites for Michael Addition,” International Journal of Molecular Sciences, Vol. 12, No. 11, 2011, pp. 7438-7444.
 Y. L. Geng, L. Y. Hu, X. Q. Zhao, H. L. An and Y. J. Wang, “Synthesis of 4, 4’-MDC in the Presence of Sulfonic Acid-Functionalized Ionic Liquids,” Chinese Journal of Chemical Engineering, Vol. 17, No. 5, 2009, pp. 756-760. doi:10.1016/S1004-9541(08)60273-6
 Z. F. Fei, D. B. Zhao, T. J. Geldbach, R. Scopelliti and P. J. Dyson, “Br?nsted Acidic Ionic Liquids and Their Zwitterions: Synthesis, Characterization and pKa Determination,” Chemistry: A European Journal, Vol. 10, No. 19, 2004, pp. 4886-4893. doi:10.1002/chem.200400145
 X. F. Liu, L. F. Xiao, H. Wu, Z. Li, J. Chen and C. G. Xia, “Novel Acidic Ionic Liquids Mediated Zinc Chloride: Highly Effective Catalysts for the Beckmann Rearrange- ment,” Catalysis Communications, Vol. 10, No. 5, 2009, pp. 424-427. doi:10.1016/j.catcom.2008.09.007