1-Vinyl-3-butylimidazolium bromide (M1) was prepared from 1-vinylimidazole using
alkylation reaction with 1-bromobutane. 1-Bromobutane (5.05 g, 33.43 mmol) was added
dropwise to 1-vinylimidazole (2.65 g, 28.16 mmol) with moderate n-hexane used as the
solvent under nitrogen environment. The reaction temperature was 70 oC while the times of
reaction was 24 hours. The mixture continues to be stirred until cooling to room temperature
Electronic Supplementary Material (ESI) for Journal of Materials Chemistry C.
This journal is © The Royal Society of Chemistry 2015when the reaction ended. Then n-hexane was evaporated at 35 oC. Next 25 mL ethyl acetate
was added to this reaction mixture, and it was stirred vigorously. The mixture was then
filtered to remove excess 1-bromobutane. That was product remained, which was dried in
vacuum for about 24 hours at 40 oC. The product was obtained as a brown sticky liquid (5.96
g, 86.4% yield).