Abstract
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 °C for the mixture of tetrabutylammonium trifluoromethanesulfonate (N4444Tfo) 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 SN, even down to −90 °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.
| Original language | English |
|---|---|
| Pages (from-to) | 414-417 |
| Number of pages | 4 |
| Journal | Journal of Molecular Liquids |
| Volume | 274 |
| DOIs | |
| State | Published - Jan 15 2019 |
Funding
This work was supported financially by the National Natural Science Foundation of China (No. 21503196 ). X.S was supported by the U.S. Department of Energy , Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division. S.D. was supported by the U.S. Department of Energy , Office of Science, Basic Energy Sciences, Division of Chemical Sciences, Geosciences, and Biosciences.
| Funders | Funder number |
|---|---|
| U.S. Department of Energy | |
| Office of Science | |
| Basic Energy Sciences | |
| Division of Materials Sciences and Engineering | |
| Chemical Sciences, Geosciences, and Biosciences Division | |
| National Natural Science Foundation of China | 21503196 |
Keywords
- Ammonium salts
- Aprotic organics
- Deep eutectic solvents
- Hydrogen bonds
- Succinonitrile