摘要:
采用绿色化学合成法，以N-丁基咪唑和1，2-二甲基咪唑为反应原料，碳酸酯为烷基化试剂，合成了2种离子液体的中间体1-丁基-3-甲基咪唑碳酸甲酯盐([n-BMIM]OCO2Me)和1,2-二甲基-3-乙基咪唑碳酸乙酯盐([EMMIM]OCO2Et)，然后通过与HBF4及HPF6的反应，得到4种离子液体：1-丁基-3-甲基咪唑四氟硼酸盐([n-BMIM]BF4)、1-丁基-3-甲基咪唑六氟磷酸盐([n-BMIM]PF6)、1，2-二甲基-3-乙基咪唑四氟硼酸盐([EMMIM]BF4)和1,2-二甲基-3-乙基咪唑六氟磷酸盐([EMMIM]PF6).产物结构经FT-IR， 1H-NMR和质谱分析确认.最后通过差示扫描量热分析（DSC）测定6种离子液体的结晶温度或熔点.
关键词:
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离子液体
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碳酸酯
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合成
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表征
Abstract:
The alkyl imidazolium-based ionic liquids, 1-n-butyl-3-methylimidazole methyl carbonate ([n-BMIM]OCO2Me]) and 1,2-dimethyl-3-ethylimidazole ethyl carbonate ([EMMIM]OCO2Et]), were synthesized from N-methylimidazole, 1,2-dimethylimidazole and carbonates. Reacting with HBF4 and HPF6 at room temperature, [n-BMIM]OCO2Me] and [EMMIM]OCO2Et] were converted into four ionic liquids: 1-n-butyl-3-methylimidazolium tetrafluoroborate ([n-BMIM]BF4]), 1-n-butyl-3-methylimidazolium hexafluorophosphate ([n-BMIM]PF6]), 1,2-dimethyl-3-ethylimidazolium tetrafluoroborate ([EMMIM]BF4), and 1,2-dimethyl-3-ethylimidazolium hexafluorophosphate ([EMMIM]PF6). The six ionic liquids were characterized and analysed by FT-IR, 1H-NMR, ESI-MS and DSC. Environmental pollution was avoided by the green chemical synthetic method in comparison with the traditional two-step synthesis.
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