Patent ID: 7842804

Claim:
A salt having a cation selected from the group consisting of wherein R 1′ to R 4′ each, independently of one another, have the meaning hydrogen or CN, straight-chain or branched alkyl having 1-20 C atoms, straight-chain or branched alkenyl having 2-20 C atoms and one or more double bonds, straight-chain or branched alkynyl having 2-20 C atoms and one or more triple bonds, dialkylamino containing alkyl groups having 1-4 C atoms, which, however, is not bonded to the heteroatom of the heterocycle, saturated, partially or fully unsaturated cycloalkyl having 3-7 C atoms, which may be substituted by alkyl groups having 1-6 C atoms or aryl-C 1 -C 6 -alkyl, where the substituents R 1′ and R 4′ may be partially or fully substituted by F, but where R 1′ and R 4′ are not simultaneously CN or cannot simultaneously be fully substituted by F, where the substituents R 2′ and R 3′ may be partially or fully substituted by halogens or partially by NO 2 or CN, and where, in the substituents R 1′ to R 4′ , one or two non-adjacent carbon atoms which are not bonded directly to the heteroatom may be replaced by atoms and/or atom groups selected from the group consisting of —O—, —S—, —S(O)—, —SO 2 — and —NR′— or by the end group CN, —C(O)X′ or —SO 2 X′, where R′=H, non-, partially or perfluorinated C 1 - to C 6 -alkyl, C 3 - to C 7 -cycloalkyl, unsubstituted or substituted phenyl, or an unsubstituted or substituted heterocycle, and X′=OH, F, Cl or Br, and an anion having the following formula [PF x (C y F 2y+1−z H z ) 6−x ] − where 2<x<5, 1<y<8 and 0<z<2y+1, where 1-butyl-1-methylpyrrolidinium tris(pentafluoroethyl)trifluorophosphate is excluded.