Compositions of matter useful as ionic liquids of the formula Z.sup.+A.sup.-, wherein Z.sup.+ is a cation selected from the group consisting of pyridinium, pyridazinium, pyrimidinium, pyrazinium, imidazolium, pyrazolium, thiazolium, oxazolium, triazolium, and phosphonium, ammonium cations with specified substituents, and A.sup.- is selected from the group consisting of the following three anions wherein R.sup.11, R.sup.12 and R.sup.13 are as specified. R.sup.11--CHF--CF.sub.2--SO.sub.3.sup.- Formula I R.sup.12--CF.sub.2--CF.sub.2--SO.sub.3.sup.- Formula II (R.sup.13--CHF--CF.sub.2--SO.sub.2).sub.2N.sup.- Formula III