Photoacid generator and photoreactive composition
A photoacid generator, which shows very high sensitivity in the near ultraviolet range of about 300 to 400 nm, and also can remarkably increase a reaction rate of a photoreactive composition using the same, and a photoreactive composition which can initiate the reaction even by irradiation with near ultraviolet light within a short time and also can obtain a desired reaction product. A dithienyl sulfide disulfonium salt represented by the formula (A1): a dithienyl sulfide sulfonium salt represented by the formula (B1): and a phenylthiothiophene sulfonium salt represented by the formula (C1):
1. A dithienyl sulfide disulfonium salt represented by the formula (A1):
wherein R 1a to R 4a each independently represents an optionally substituted monocyclic carbon ring group, an optionally substituted condensed polycyclic carbon ring group or an optionally substituted monocyclic heterocyclic group, and X − represents an inorganic acid ion or an organic acid ion.
2. A photoacid generator comprising the dithienyl sulfide disulfonium salt according to claim 1 .
3. A photoreactive composition comprising the photoacid generator according to claim 2 and an acid reactive compound.
4. A dithienyl sulfide sulfonium salt represented by the formula (B1):
wherein R 1b and R 2b each independently represents an optionally substituted monocyclic carbon ring group, an optionally substituted condensed polycyclic carbon ring group or an optionally substituted monocyclic heterocyclic group, R 3b to R 5b each independently represents a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 4 carbon atoms, an acyl group or a hydroxyl group, and X − represents an inorganic acid ion or an organic acid ion.
5. A photoacid generator comprising the dithienyl sulfide sulfonium salt according to claim 4 .
6. A photoreactive composition comprising the photoacid generator according to claim 5 and an acid reactive compound.
7. A phenylthiothiophene sulfonium salt represented by the formula (C1):
wherein R 1c and R 2c each independently represents an optionally substituted monocyclic carbon ring group, an optionally substituted condensed polycyclic carbon ring group or an optionally substituted monocyclic heterocyclic group, an R 3c to R 7c each independently represents a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 4 carbon atoms, an acyl group or a hydroxyl group, and X − represents an inorganic acid ion or an organic acid ion.
8. A photoacid generator comprising the phenylthiothiophene sulfonium salt according to claim 7 .
9. A photoreactive composition comprising the photoacid generator according to claim 8 and an acid reactive compound.