Patent ID: 6841333

Claim:
An ionic photoacid generator comprising: (a) a cation comprising at least one of i. a transition metal containing organometallic cation, ii. an organic onium cation, or iii. a mixture thereof, and (b) an anion of the formula O 3 S—R f —Q—(R h —Z m ) n where: R f is a highly fluorinated divalent aalkylene moiety, wherein there are at least two fluorinated carbon atoms between said Q group and said O 1 S group; R h is a hydrocarbon moiety; n is 1 to 2; m is independently 1 to 3; Q is a covalent bond —C(O)O—, —C(O)S—, —SO 2 O—, —SO 2 S—, —S—, —S(O)— and —SO 2 —, and Z is a pendant group selected from the group consisting of —Cl, —Br, —I, —NO 2 . —SO 3 − , —H, —CN, —NCO, —OCN, —CO 2 − , —OH, —OR 1 ′, —SR 1 ′, —C(O)N(R 1 ′) 2 , —N(R 1 ′)C(O)R 1 ′, —N(R 1 ′)SO 2 R 1 ′, —SO 2 N(R 1 ′) 2 , —SO 2 R 1 ′, —SOR 1 ′, —OC(O)R 1 ′, —C(O)OR 1 ′, —C(O)R 1 ′, —Si(OR 1 ′) 3 , —Si(R 1 ′) 3 , and an epoxy group, where R 3 ′ is independently H, an unbranched or branched, cyclic or acyclic, saturated or unsaturated alkyl group.