Patent ID: 7211636

Claim:
An ionic compound comprising a cationic portion and an anionic portion, wherein the cationic portion is [HO(CH 2 ) n —O-Φ] 2 -S + -Φ-S-Φ-S + -[Φ-O—(CH 2 ) n OH] 2 , [HOOC(CH 2 ) 2 —O-Φ] 2 -S + -Φ-S-Φ-S + -[Φ-O—(CH 2 ) 2 COOH] 2 , [HO(CH 2 ) n —O-Φ] 2 -S + -Φ-S-Φ, [HOOC(CH 2 ) n —O-Φ] 2 -S + -Φ-S-Φ, [HO(CH 2 ) n —O-Φ] 2 -S + -Φ, [HO(CH 2 ) n —O-Φ]-S + -Φ 2 , [HOOC(CH 2 ) n —O-Φ] 2 -S + -Φ, [HOOC(CH 2 ) n —O-Φ]-S + -Φ 2 , HO(CH 2 ) n —O-Φ-I + -Φ, HOOC(CH 2 ) n —O-Φ-I + -Φ, [HO(CH 2 ) n —O-Φ] 2 I + or [HOOC(CH 2 ) n —O-Φ] 2 I + and the anionic portion is represented by the formula (1): [BR 4 ] − (1) wherein R may be the same or different and represents a phenyl group substituted with F or CF 3 , and n is an integer of 2 to 6.