期刊
JOURNAL OF MOLECULAR LIQUIDS
卷 274, 期 -, 页码 414-417出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.molliq.2018.10.150
关键词
Deep eutectic solvents; Aprotic organics; Hydrogen bonds; Ammonium salts; Succinonitrile
资金
- National Natural Science Foundation of China [21503196]
- U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division
- U.S. Department of Energy, Office of Science, Basic Energy Sciences. Division of Chemical Sciences, Geosciences, and Biosciences
Deep eutectic solvents (DESs) are conventionally prepared by mixing quaternary ammonium salts and protic organic compounds such as alcohol, amide or carboxylic acid. In this work, we report that the DESs can also be obtained by using an aprotic organic compound such as succinonitrile (SN). The eutectic temperature was found to be 12 degrees C for the mixture of tetrabutylammonium trifluoromethanesulfonate (N(4444)Tfo) and SN at a molar ratio of 1:6, but no melting point could be observed for several DESs formed by tetrabutylammonium chloride (N4444Cl) and SR even down to -90 degrees C. Fourier transform infrared spectroscopy (FTIR), Nuclear Magnetic Resonance (NMR) and theoretical calculations indicated the formation of hydrogen bonds between the anions of the ammonium salts and the methylene group of the SN, which greatly impact the melting behavior of the DESs. (C) 2018 Elsevier B.V. All rights reserved.
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