新型离子液体1-烷基-3-甲基咪唑苯甲酰基三氟硼酸盐的合成与性质  

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

作　　者：郭一江 陈庆德[1] 沈兴海[1] GUO Yijiang;CHEN Qingde;SHEN Xinghai(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)

机构地区：[1]北京大学化学与分子工程学院放射化学与辐射化学重点学科实验室北京分子科学国家研究中心北京大学应用物理与技术研究中心

出　　处：《应用化学》2019年第10期1186-1193,共8页Chinese Journal of Applied Chemistry

基　　金：国家自然科学基金(U1830202,U1507203)资助~~

摘　　要：合成了新型离子液体1-烷基-3-甲基咪唑苯甲酰基三氟硼酸盐[Cn mim][BTB](n=4,6,8),并通过NMR、差热、热重等方法研究了其基础物化性质。结果发现,3种离子液体的分解温度在200℃左右;随着阳离子碳链的增长,离子液体的粘度、熔点逐渐升高,并从亲水性变为疏水性。尤其是疏水性的[C6 mim][BTB]和[C8 mim][BTB]在与水长时间的混合中表现出较好的稳定性,基本解决了四氟硼酸盐离子液体亲水性强、BF-4易水解的缺点,有望用于乏燃料后处理并提高临界安全。Three novel boron-containing ionic liquids(ILs),1-alkyl-3-methylimidazolium benzyoltrifluoroborates([Cn mim][BTB],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.[C4 mim][BTB]was hydrophilic,while[C6 mim][BTB]and[C8 mim][BTB]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 BF-4)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.

关 键 词：含硼离子液体 酰基三氟硼酸盐 疏水性 稳定性 

分 类 号：O645.4[理学—物理化学] O652.6[理学—化学]