| Abstract
| - In this paper we study the photophysical and photochemical behavior of two aromaticN-oxyimidosulfonate photoacid generators (PAGs), N-trifluoromethylsulfonyloxy-phthalimide(PIT) and N-trifluoromethylsulfonyloxy-1,8-naphthalimide (NIT), by means of absorptionand emission stationary techniques and nanosecond and picosecond laser flash photolysis.Triplet states have been detected for both compounds; lifetimes of 12 μs and 43 μs (acetonitrilesolution) and 2 μs and 28 μs, (benzene solution), were measured for PIT and NIT, respectively.Photoacid generation quantum yields have also been measured (Φ = 0.28 in acetonitrile, Φ= 0.21 in benzene for PIT; Φ = 0.17 in acetonitrile, Φ = 0.09 in benzene for NIT), usingRhodamine B Base as an acid sensor and 2-methyl-4,6-bis(trichloromethyl)-1,3,5-triazineas a suitable actinometer with 308-nm laser excitation. Evidence that photoacid generationoccurs through an ionic mechanism from the singlet state was obtained.
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