Imidazolium-based ionic liquid salts: 3,3′-dimethyl-1,1′-(1,4-phenylenedimethylene)diimidazolium bis(tetrafluoroborate) and 3,3′-di-<i>n</i>-butyl-1,1′-(1,4-phenylenedimethylene)diimidazolium bis(trifluoromethanesulfonate)
Acta crystallographica. Section C, Crystal structure communications/Acta crystallographica. Section C, Crystal structure communications.