Abstract New ionic liquids containing alkyl and polyfluoroalkyl substituents and various anions were synthesized from 2, 3, 4, 6, 7, 8, 9, 10-octahydropyrimido [1, 2-a] azepinium ion (1, 8-diazabicyclo [5.4. 0] undec-7-en-8-ium). Their NMR spectra and miscibility with water and organic solvents were studied.