咪唑类离子液体的微波水浴合成及性能研究

Study on microwave-assisted synthesis and performance of imidazole ionic liquids

以N-甲基咪唑、氯代正丁烷、KPF6及NaBF4等为原料,分别在微波和水浴2种加热条件下利用二步法合成出2种咪唑类离子液体[BMIM]PF6和[BMIM]BF4。比较了2种方法在中间体合成及阴离子置换中的优势和劣势,并利用IR,TGA和LSV等方法表征了所得离子液体的结构特征及电化学性能。结果表明,2种方法所合成的离子液体在物化性质上无明显差异。微波法在合成中间体时可显著缩短反应时间,产率可达90%以上;水浴加热法则更有利于阴离子置换。故采用微波法与水浴加热法相结合的方式合成离子液体可收到良好的效果。

Two kinds of imidazole ionic liquids （[BMIM] PF6 and [BMIM] BF4 ） are synthesized from N-methyl-midazolium, chlorobutane, KPF6 and NaBF4 under microwave irradiation and water bath heating respectively by two-step method. The ad- vantage and disadvantage in the synthesis of intermediate and anion exchange are compared, and the structure characteristics and electrochemical performance are characterized. The result shows that the ionic liquids synthesized by two different methods have no evident discrepancy. The reaction time can be cut down markedly under the microwave, and the productivity can exceed 90 %, while the water bath heating is propitious to anion exchange. So combining the two methods will get a favorable result.