Miscibility of tetrafluoroborate ionic liquids with dihydroxy alcohols

► The longer alkyl chain in imidazolium cation of investigated ionic liquid, the worse miscibility with 1,2-ethanediol ► Miscibility of tetrafluoroborate ILs with (1,ω)diols is much worse than that with (1,2)diols. ► Miscibility of butanediol isomers with [bmim][BF4] or [omim][BF4] is better for the solvent with lower dielectric constant.