Microwave-assisted synthesis and characterization of 1-hexyl-3-methylimidazolium hexafluorophosphate ionic liquid

The intermediate 1-hexyl-3-methylimidazolium bromide ([HMIM]Br) was synthesized from N-methylimidazolium and 1-hexylbromide under microwave radiation,and 1-hexyl-3-methylimidazolium hexafluorophosphate ( [HMIM]PF6) was then prepared using [HMIM]Br and KPF6 by anion exchange.Compared with traditional methods,the reaction time required was greatly reduced. The structure of the synthesized product was confirmed by FT-IR,1HNMR and 13CNMR,and the purity of the product was determined to be above 99.0% using high performance liquid chromatography.