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Zhang J, Yao J, Li H. Solvent Effect on the Ionicity of Protic Ionic Liquid: 1-Methylimidazolium-Acetic Acid. J Phys Chem B 2022; 126:2279-2284. [PMID: 35271286 DOI: 10.1021/acs.jpcb.2c00973] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Here, we report that the ionicity of a protic ionic liquid (PIL) could be changed when it was mixed with a solvent. Ionicities of PIL 1-methylimidazolium-acetic acid in N,N-dimethyl formamide, dimethyl sulfoxide, tetrahydrofuran, diethyl ether, ethyl acetate, acetonitrile, acetone, and 1,2-dichloroethane have been investigated by a 1H NMR-based method at 298.15 K. The ionicity of a neat PIL is 92.8%. It changed a little with adding a small amount of solvent; however, when the PIL was highly diluted, it could dramatically increase to nearly 100% in acetone and decrease to about 63.9% in dimethyl sulfoxide. Furthermore, some possible factors influencing the ionicities of these PIL solutions were discussed. This research highlights the solvent effect on the ionicity of a PIL solution and offers opportunities for designing a PIL solution.
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Affiliation(s)
- Jiao Zhang
- Department of Chemistry, ZJU-NHU United R&D Center, Zhejiang University, Hangzhou 310027, P. R. China
| | - Jia Yao
- Department of Chemistry, ZJU-NHU United R&D Center, Zhejiang University, Hangzhou 310027, P. R. China
| | - Haoran Li
- Department of Chemistry, ZJU-NHU United R&D Center, Zhejiang University, Hangzhou 310027, P. R. China.,State Key Laboratory of Chemical Engineering, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, P. R. China
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Wang Y, Wen Z, Zhang Y, Wang X, Yao J, Li H. Aerobic α-hydroxylation of 2-Me-1-tetralone in 1-alkyl-3-methylimidazolium ionic liquids. Phys Chem Chem Phys 2021; 23:5864-5869. [PMID: 33687394 DOI: 10.1039/d0cp06047j] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
The aerobic α-hydroxylation of 2-Me-1-tetralone was investigated in imidazol-based ionic liquids (ILs), where reactions in 1-alkyl-3-methylimidazolium tetrafluoroborates were found to generate considerable products. By correlating the conversion at 2 h with viscosity, relative permittivity and the ET(30) value of ILs, we found that the local polarity in ILs represented by the ET(30) value or the chemical shift of α-proton at the substrate was the critical factor influencing the reaction rate. Furthermore, two-dimensional nuclear Overhauser effect spectroscopy (2D NOESY) was used to characterize the distribution of 2-Me-1-tetralone in ILs. As a result, the mesoscopic structures in ILs were recommended to have crucial influences on the distribution of the substrate in ILs, and the caused local polarity could affect the activation of 2-Me-1-tetralone. These findings revealed the solvent effects of ILs with different structures on the α-hydroxylation of 2-Me-1-tetralone, and may encourage the explorations of more types of aerobic oxidations in ILs.
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Affiliation(s)
- Yongtao Wang
- Department of Chemistry, ZJU-NHU United R&D Center, Zhejiang University, 38 Zheda Road, Hangzhou, 310027, China. and Center of Chemistry for Frontier Technologies, Zhejiang University, Hangzhou, 310027, China
| | - Zeyu Wen
- Department of Chemistry, ZJU-NHU United R&D Center, Zhejiang University, 38 Zheda Road, Hangzhou, 310027, China. and Center of Chemistry for Frontier Technologies, Zhejiang University, Hangzhou, 310027, China
| | - Yue Zhang
- Department of Chemistry, ZJU-NHU United R&D Center, Zhejiang University, 38 Zheda Road, Hangzhou, 310027, China.
| | - Xinyu Wang
- Department of Chemistry, ZJU-NHU United R&D Center, Zhejiang University, 38 Zheda Road, Hangzhou, 310027, China.
| | - Jia Yao
- Department of Chemistry, ZJU-NHU United R&D Center, Zhejiang University, 38 Zheda Road, Hangzhou, 310027, China.
| | - Haoran Li
- Department of Chemistry, ZJU-NHU United R&D Center, Zhejiang University, 38 Zheda Road, Hangzhou, 310027, China. and State Key Laboratory of Chemical Engineering, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou, 310027, China
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Wang X, Zhang S, Yao J, Li H. The Polarity of Ionic Liquids: Relationship between Relative Permittivity and Spectroscopic Parameters of Probe. Ind Eng Chem Res 2019. [DOI: 10.1021/acs.iecr.9b00485] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Xinyu Wang
- Department of Chemistry, ZJU-NHU United R&D Center, Zhejiang University, Hangzhou 310027, P.R. China
| | - Songna Zhang
- Department of Chemistry, ZJU-NHU United R&D Center, Zhejiang University, Hangzhou 310027, P.R. China
| | - Jia Yao
- Department of Chemistry, ZJU-NHU United R&D Center, Zhejiang University, Hangzhou 310027, P.R. China
| | - Haoran Li
- Department of Chemistry, ZJU-NHU United R&D Center, Zhejiang University, Hangzhou 310027, P.R. China
- State Key Laboratory of Chemical Engineering, Department of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, P.R. China
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Dao R, Wang X, Chen K, Zhao C, Yao J, Li H. Landscape of the structure–O–H bond dissociation energy relationship of oximes and hydroxylamines. Phys Chem Chem Phys 2017; 19:22309-22320. [PMID: 28805227 DOI: 10.1039/c7cp03809g] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Extensive data are provided for in-depth understanding of the structure–O–H-bond-dissociation-energy-relationship of oximes and hydroxylamines, and novel insights are brought to electronic effects.
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Affiliation(s)
- Rina Dao
- Department of Chemistry
- ZJU-NHU United R&D Center
- Zhejiang University
- Hangzhou 310027
- P. R. China
| | - Xinyu Wang
- Department of Chemistry
- ZJU-NHU United R&D Center
- Zhejiang University
- Hangzhou 310027
- P. R. China
| | - Kexian Chen
- School of Food Science and Biotechnology
- Zhejiang Gongshang University
- Hangzhou
- P. R. China
| | - Chenxuan Zhao
- Department of Chemistry
- ZJU-NHU United R&D Center
- Zhejiang University
- Hangzhou 310027
- P. R. China
| | - Jia Yao
- Department of Chemistry
- ZJU-NHU United R&D Center
- Zhejiang University
- Hangzhou 310027
- P. R. China
| | - Haoran Li
- Department of Chemistry
- ZJU-NHU United R&D Center
- Zhejiang University
- Hangzhou 310027
- P. R. China
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