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5 Zhang Q G, Wang N N, Yu Z W.Hydrogen bonding interactions between the ionic liquid 1-ethyl-3-methylimidazolium ethyl sulfate and water.J Phys Chem B, 2010, 114:4747-4754
6 Wang C, Zhao W, Li H R, et al.Solvent-free synthesis of unsaturated ketones by Saucy-Marbet reaction with simple ammonium ionic liquid as the catalyst.Green Chem, 2009, 11:843-847
7 Wang H Y, Wang J J, Fan M H.Extraction of ionic liquids from aqueous solutions by humic acid:An environmentally benign, inexpensive and simple procedure.Chem Commun, 2012, 48:392-394
11 Sun J, Wang L, Zhang S J, et al.ZnCl2/phosphonium halide:An efficient Lewis acid/base catalyst for the synthesis of cyclic carbonate.J Mol Catal A Chem, 2006, 256:295-300
12 Duan Z Y, Gu Y L, Deng Y Q.Green and moisture-stable Lewis acidic ionic liquids(choline chlorid xZnCl2) catalyzed protection of carbonyls at room temperature under solvent-free conditions.Catal Commun, 2006, 7:651-656
13 Guo S, Du Z Y, Zhang S G, et al.Clean Beckmann rearrangement of cyclohexanone oxime in caprolactam-based Br？nsted acidic ionic liquids.Green Chem, 2006, 8:296-300
14 Earle M J, McCormac P B, Seddon K R.Diels-Alder reactions in ionic liquids.A safe recyclable alternative to lithium perchlorate-diethyl ether mixtures.Green Chem, 1999, 1:23-25
15 Xing H B, Wang T, Zhou Z H, et al.The sulfonic acid-functionalized ionic liquids with pyridinium cations:Acidities and their acidity-catalytic activity relationships.J Mol Catal A Chem, 2007, 264:53-59
16 Wang L B, Gao J B, Zou T, et al.Synthesis of Lewis-Br？nsted combined basic ionic liquids and their catalytic performance in Knoevenagel condensation(in Chinese).Chin Sci Bull(Chin Ver), 2008, 53:626-630 [王丽冰, 高金宝, 邹婷, 等.Lewis-Br？nsted复合碱性离子液体的合成及其在催化Knoevenagel缩合反应中溶剂效应的研究.科学通报, 2008, 53:626-
18 Deng H, Li X, Yuan C, et al.Standard pKa scales of carbon-centered indicator acids in ionic liquids:Effect of media and structural implication.J Org Chem, 2012, 77:7291-7298
19 Wang Z, Deng H, Li X, et al.Standard and absolute pKa scales of substituted benzoic acids in room temperature ionic liquids.J Org Chem, 2013, 78:12487-12493
20 Xue X S, Yang C, Lia X, et al.Computation of standard equilibrium acidity of C-H acids in ionic media:Shedding light on predicting changes of chemical behavior by switching solvent system from molecular to ionic.Org Chem Front, 2014, 1:176-180
22 Geng W G, Li X H, Wang Y F.Acidic characterization of polycarboxyl imidazolium ionic liquids(in Chinese).Acta Phys Chim Sin, 2006, 22:230-233 [耿卫国, 李雪辉, 王乐夫.多羧基咪唑离子液体的酸性表征.物理化学学报, 2006, 22:230-
23 Fei Z F, Zhao D B, Geldbach T J.Br？nsted acidic ionic liquids and their zwitterions:Synthesis, characterization and pKa determination.Chem Eur J, 2004, 10:4886-4893
24 Thomazeau C, Olivier-Bourbigou H, Magna L, et al.Determination of an acidic scale in room temperature ionic liquids.J Am Chem Soc, 2003, 125:5264-5265
27 Hammett L P, Deyrup A J.A series of simple basic indicators.I.The acidity functions of mixtures of sulfuric and perchloric acids with water.J Am Chem Soc, 1932, 54:2721-2739
28 Ali A, Ali M, Malik N A, et al.Solvatochromic absorbance probe behavior within mixtures of the ionic liquid 1-butyl-3-methylimidazo-lium bis(trifluoromethylsulfonyl)imide + molecular organic solvents.J Chem Eng Data, 2014, 59:1755-1765
29 Thomazeau C, Olivier-Bourbigou H, Magna L, et al.Determination of an acidic scale in room temperature ionic liquids.J Am Chem Soc, 2003, 125:5264-5265
30 Wang Z, Ji P J, Li X, et al.Double-line hammett relationship revealed through precise acidity measurement of benzenethiols in neat ionic media:A typical “ionic liquid effect”? Org Lett, 2014, 16:5744-5747
31 Gu Y L, Zhang J, Duan Z Y, et al.Pechmann reaction in non-chloroaluminate acidic ionic liquids under solvent-free conditions.Adv Synth Catal, 2005, 347:512-516
33 Bui T L T.Investigations on alkylation of isobutane with 2-butene using highly acidic ionic liquids as catalysts.Lehrstuhl für Chemische Verfahrenstechnik, Universit？t Bayreuth, 2007
36 Zhou Y, Zheng Y Z, Sun H Y, et al.Hydrogen bonding interactions in ethanol and acetonitrile binary system:A near and mid-infrared spectroscopic study.J Mol Struct, 2014, 1069:251-257
37 Fumino K, Fossog V, Stange P, et al.Ion pairing in protic ionic liquids probed by far-infrared spectroscopy:Effects of solvent polarity and temperature.ChemPhysChem, 2014, 15:2604-2609
38 Wang X H, Tao G H, Wu X M, et al.Investigation of the acidity of ionic liquid by IR spectroscopy(in Chinese).Acta Phys Chim Sin, 2005, 21:528-533 [王晓化, 陶国宏, 吴晓牧, 等.离子液体酸性的红外光谱探针法研究.物理化学学报, 2005, 21:528-
40 Fawcett W R, Liu G J, Kessler T E.Solvent-induced frequency shifts in the infrared spectrum of acetonitrile in organic solvents.J Phys Chem, 1993, 97:9293-9298
41 Wu Q, Han M H, Xin H L, et al.Study on IR spectroscopy and quantum chemical calculation of chloroaluminate ionic liquids acidity(in Chinese).Spectrosc Spect Anal, 2008, 28:282-284 [吴芹, 韩明汉, 辛洪良, 等.氯铝酸离子液体酸性的红外光谱探针和量子化学研究.光谱学与光谱分析, 2008, 28:282-
42 Wu Q, Dong B Q, Han M H, et al, Study on acidity of chloroaluminate ionic liquids using pyridine as infrared spectroscopic probe(in Chinese).Chin J Anal Chem, 2006, 34:1323-1326 [吴芹, 董斌琦, 韩明汉, 等.氯铝酸离子液体酸性的吡啶探针红外光谱研究.分析化学, 2006, 34:1323-]
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5 Zhang Q G, Wang N N, Yu Z W. Hydrogen bonding interactions between the ionic liquid 1-ethyl-3-methylimidazolium ethyl sulfate and water. J Phys Chem B, 2010, 114: 4747-4754
40 Fawcett W R, Liu G J, Kessler T E. Solvent-induced frequency shifts in the infrared spectrum of acetonitrile in organic solvents. J Phys Chem, 1993, 97: 9293-9298
41 Wu Q, Han M H, Xin H L, et al. Study on IR spectroscopy and quantum chemical calculation of chloroaluminate ionic liquids acidity (in Chinese). Spectrosc Spect Anal, 2008, 28: 282-284 [吴芹, 韩明汉, 辛洪良, 等. 氯铝酸离子液体酸性的红外光谱探针和量子化学研 究. 光谱学与光谱分析, 2008, 28: 282-
42 Wu Q, Dong B Q, Han M H, et al, Study on acidity of chloroaluminate ionic liquids using pyridine as infrared spectroscopic probe (in Chinese). Chin J Anal Chem, 2006, 34: 1323-1326 [吴芹, 董斌琦, 韩明汉, 等. 氯铝酸离子液体酸性的吡啶探针红外光谱研究. 分 析化学, 2006, 34: 1323- ？
6 Wang C, Zhao W, Li H R, et al. Solvent-free synthesis of unsaturated ketones by Saucy-Marbet reaction with simple ammonium ionic liquid as the catalyst. Green Chem, 2009, 11: 843-847
7 Wang H Y, Wang J J, Fan M H. Extraction of ionic liquids from aqueous solutions by humic acid: An environmentally benign, inexpensive and simple procedure. Chem Commun, 2012, 48: 392-394
11 Sun J, Wang L, Zhang S J, et al. ZnCl2/phosphonium halide: An efficient Lewis acid/base catalyst for the synthesis of cyclic carbonate. J Mol Catal A Chem, 2006, 256: 295-300
12 Duan Z Y, Gu Y L, Deng Y Q. Green and moisture-stable Lewis acidic ionic liquids (choline chlorid xZnCl2) catalyzed protection of carbonyls at room temperature under solvent-free conditions. Catal Commun, 2006, 7: 651-656
13 Guo S, Du Z Y, Zhang S G, et al. Clean Beckmann rearrangement of cyclohexanone oxime in caprolactam-based Br？nsted acidic ionic liquids. Green Chem, 2006, 8: 296-300
14 Earle M J, McCormac P B, Seddon K R. Diels-Alder reactions in ionic liquids. A safe recyclable alternative to lithium perchlorate-diethyl ether mixtures. Green Chem, 1999, 1: 23-25
15 Xing H B, Wang T, Zhou Z H, et al. The sulfonic acid-functionalized ionic liquids with pyridinium cations: Acidities and their acidity- catalytic activity relationships. J Mol Catal A Chem 2007, 264: 53-59
17 Chiappe C, Rajamani S. Structural effects on the physico-chemical and catalytic properties of acidic ionic liquids: An overview. Eur J Org Chem, 2011, (28): 5517-5539
18 Deng H, Li X, Yuan C, et al. Standard pKa scales of carbon-centered indicator acids in ionic liquids: Effect of media and structural implication. J Org Chem, 2012, 77: 7291-7298
19 Wang Z, Deng H, Li X, et al. Standard and absolute pKa scales of substituted benzoic acids in room temperature ionic liquids. J Org Chem, 2013, 78: 12487-12493
20 Xue X S, Yang C, Lia X, et al. Computation of standard equilibrium acidity of C-H acids in ionic media: Shedding light on predicting changes of chemical behavior by switching solvent system from molecular to ionic. Org Chem Front, 2014, 1: 176-180
22 Geng W G, Li X H, Wang Y F. Acidic characterization of polycarboxyl imidazolium ionic liquids (in Chinese). Acta Phys Chim Sin,2006, 22: 230-233 [耿卫国, 李雪辉, 王乐夫. 多羧基咪唑离子液体的酸性表征. 物理化学学报, 2006, 22: 230-
23 Fei Z F, Zhao D B, Geldbach T J. Br？nsted acidic ionic liquids and their zwitterions: Synthesis, characterization and pKa determination. Chem Eur J, 2004, 10: 4886-4893
24 Thomazeau C, Olivier-Bourbigou H, Magna L, et al. Determination of an acidic scale in room temperature ionic liquids. J Am Chem Soc,2003, 125: 5264-5265
27 Hammett L P, Deyrup A J. A series of simple basic indicators. I. The acidity functions of mixtures of sulfuric and perchloric acids with water. J Am Chem Soc, 1932, 54: 2721-2739
28 Ali A, Ali M, Malik N A, et al. Solvatochromic absorbance probe behavior within mixtures of the ionic liquid 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide + molecular organic solvents. J Chem Eng Data, 2014, 59: 1755-1765
29 Thomazeau C, Olivier-Bourbigou H, Magna L, et al. Determination of an acidic scale in room temperature ionic liquids. J Am Chem Soc,2003, 125: 5264-5265
30 Wang Z, Ji P J, Li X, et al. Double-line hammett relationship revealed through precise acidity measurement of benzenethiols in neat ionic media: A typical “ionic liquid effect”? Org Lett, 2014, 16: 5744-5747
31 Gu Y L, Zhang J, Duan Z Y, et al. Pechmann reaction in non-chloroaluminate acidic ionic liquids under solvent-free conditions. Adv Synth Catal, 2005, 347: 512-516
33 Bui T L T. Investigations on alkylation of isobutane with 2-butene using highly acidic ionic liquids as catalysts. Lehrstuhl für Chemische Verfahrenstechnik, Universit？t Bayreuth, 2007
36 Zhou Y, Zheng Y Z, Sun H Y, et al. Hydrogen bonding interactions in ethanol and acetonitrile binary system: A near and mid-infrared spectroscopic study. J Mol Struct, 2014, 1069: 251-257
37 Fumino K, Fossog V, Stange P, et al. Ion pairing in protic ionic liquids probed by far-infrared spectroscopy: Effects of solvent polarity and temperature. ChemPhysChem, 2014, 15: 2604-2609
38 Wang X H, Tao G H, Wu X M, et al. Investigation of the acidity of ionic liquid by IR spectroscopy (in Chinese). Acta Phys Chim Sin,2005, 21: 528-533 [王晓化, 陶国宏, 吴晓牧, 等. 离子液体酸性的红外光谱探针法研究. 物理化学学报, 2005, 21: 528-
