Citation: GUO Yijiang, CHEN Qingde, SHEN Xinghai. Syntheses and Properties of Novel Boron-Containing Ionic Liquids 1-Alkyl-3-methylimidazolium Benzyoltrifluoroborates[J]. Chinese Journal of Applied Chemistry, ;2019, 36(10): 1186-1193. doi: 10.11944/j.issn.1000-0518.2019.10.190163 shu

Syntheses and Properties of Novel Boron-Containing Ionic Liquids 1-Alkyl-3-methylimidazolium Benzyoltrifluoroborates

Beijing National Laboratory for Molecular Sciences, Fundamental Science on Radiochemistry and Radiation Chemistry Laboratory, Center for Applied Physics and Technology, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China

Corresponding author: CHEN Qingde, qdchen@pku.edu.cn SHEN Xinghai, xshen@pku.edu.cn
Received Date: 4 June 2019
Revised Date: 24 July 2019
Accepted Date: 29 August 2019

Fund Project: the National Natural Science Foundation of China U1507203the National Natural Science Foundation of China U1830202Supported by the National Natural Science Foundation of China(No.U1830202, No.U1507203)

Figures(5)

Three novel boron-containing ionic liquids(ILs), 1-alkyl-3-methylimidazolium benzyoltrifluoroborates([C_nmim], n=4, 6, 8), were successfully synthesized and some of their physico-chemical properties were characterized by nuclear magnetic resonance(NMR), differential scanning calorimeter(DSC), and thermogravimetric analysis(TGA). It was found that their decomposition temperatures were around 200℃. With the increase of the length of carbon chain on the imidazolium ring, the melting temperature, viscosity and hydrophobicity gradually increased.[C₄mim] was hydrophilic, while[C₆mim] and[C₈mim] were hydrophobic. In particular, the later two were more stable when they mixed with water for a long time. In other words, the shortcoming of tetrafluoroborate ILs(i.e., strong hydrophilicity, especially the easy hydrolysis of BF₄^-) was overcome to great extent. Thus, it is hopeful for the two ILs to be used in the field of spent fuel reprocessing, which will effectively impove the critical safety.
- boron-containing ionic liquid(s),
- benzyoltrifluoroborate,
- hydrophobicity,
- stability
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