Patent ID: 7153974

Claim:
A compound of the formula K + A − (I) wherein: K + is a cation selected from where R 1 to R 6 are identical or different and are each individually H, halogen, an alkyl radical (C 1 to C 8 ), which is unsubstituted or partially or fully substituted by F, Cl, N(C n F (2n+1−x) H x ) 2 , O(C n F (2n+1−x) H x ), or (C n F (2n+1−x) H x ), where 1<n<6 and 0<x≦13, a phenyl radical which is unsubstituted or partially or fully substituted by F, Cl, N(C n F (2n+1+x) H x ) 2 , O(C n F (2n+1−1) H x ), SO 2 (C n F (2n+1−x) H x ) or C n F (2n+1−x) H x where 1<n<6 and 0<x≦13, or one or more pairs of adjacent R 1 to R 6 can also be an alkylene or alkenylene radical having up to 8 C atoms and which is unsubstituted or partially or fully unsubstituted by halogen, N(C n F (2n+1x) H x ) 2 , O(C n F (2n+1−x) H x ), SO 2 (C n F (2n+1−x) H x or C n F (2n+1−x) H x where 1<n<6 and 0≦x≦13; and A − is an anion of the following formula [PF x (C y F 2y+1−z H z ) 6−x ] − where 1≦x<6 2≦y≦8 and 0≦z≦2y+1.