The crystal structures of 1-(4-halo-2,3,5,6-tetrafluorophenyl)-3-benzylimidazolium bromides: The relative importance of anion–π, lone pair–π, π π stacking and halogen bonding interactions

•Orthogonal columns of π─π stacked polyfluorophenyl and phenyl rings in three directions.•Columns of alternating polyfluorophenyl rings and bromide anions.•Columns of alternating polyfluorophenyl rings and iodine atoms.•Comparison of the strengths of anion─π, lone pair─π, π─π stacking and halogen bonding interactions.