超声辅助的异喹啉-离子液体的合成和表征

Ultrasound-assisted synthesis and characterization of isoquinoline-based ionic liquids

为解决传统加热法合成异喹啉-离子液体存在的问题,开发了一种超声辅助合成异喹啉-离子液体的方法。通过异喹啉季铵化过程的对比研究,证明了该方法具有环保性强、产率高、反应时间短等优点。将其扩展至阴离子交换反应,发现超声辐射法有效促进了异喹啉溴化物与简单阴离子[N(CF3SO2)2]-和[PF6]-,以及与复杂阴离子2,4-二氯苯氧乙酸的阴离子交换反应。对所得到的异喹啉-离子液体进行了结构表征以及热行为和溶解度的研究和讨论。结果表明,所得液体具有良好的热稳定性,为快速、高效建立绿色多功能化离子液体库奠定了基础。

To solve the problems in the conventional thermal heating synthesis of isoquinoline-based ionic liquids,an ultrasound-assisted synthesis of isoquinoline-based ionic liquids was developed.The comparative study of the quaternization process of isoquinoline proved that the method has apparent advantages over conventional thermal heating,i.e.,ecofriendly nature,higher yield,and shorter reaction time.The ultrasonic method was then extended to the anion exchange reaction.The results demonstrated that the use of ultrasound irradiation efficiently promoted the anion-exchange reaction of isoquinolinium bromides with simple anions[N(CF3SO2)2]-and[PF6]-.It was also found that the anion-exchange reactions of isoquinolinium bromides with complex 2,4-dichlorophenoxyacetic acid anion were realized under ultrasonic conditions,which could not be achieved under the conventional heating method.The structure characterization,thermal behavior,and solubility of the obtained ionic liquids were investigated and discussed.All ionic liquids exhibited good thermal stability.This article thus provides a rapid and efficient method for the establishment of a multifunctionalized ionic liquids library.