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通过三烷基钖四氟硼酸盐与烷基咪唑作用一步合成了一系列二烷基咪唑四氟硼酸离子液体,所有反应在室温下5～120分钟内完成,产率均>99%.对以上离子液体中可能含有的主要杂质进行了测定,结果表明,通过一步法合成的离子液体中卤素离子、Na+和卤代烷的含量均低于检出限,烷基咪唑的含量在0～0.53wt%范围内.此方法具有简单、快速、清洁等优点,是一种制备高纯度离子液体可行方法.
A series of dialkylimidazolium tetrafluoroborate ionic liquids were synthesized by the reaction of trialkylphosphonium tetrafluoroborate and alkylimidazole. All the reactions were completed within 5 ~ 120 minutes at room temperature with the yield> 99% The main impurities that may be contained in the above ionic liquids were measured. The results show that the content of halogen ions, Na + and alkyl halides in the ionic liquid synthesized by the one-step method are lower than the detection limits, and the content of alkyl imidazole is in the range of 0-0.53wt% This method is simple, fast, clean, etc., is a feasible method for preparing high purity ionic liquids.