Picosecond-nanosecond laser photolysis studies of a photoacid generator in solutions: Transient absorption spectroscopy and transient grating measurements.
Photochemical reaction profiles of a photoacid generator, N-trifluoromethylsulfonyloxy-1,8-naphthalimide (NI-Sf), in solution phase were investigated by means of picosecond and nanosecond transient absorption spectroscopy as well as transient grating measurements. Picosecond transient absorption spectroscopy directly revealed that the lifetime of the S1 state and the intersystem-crossing yield decreased with increasing solvent polarity. On the other hand, photochemical reaction yield increased with an increase in the solvent polarity. These results indicated that the photochemical reaction started in the S1 state. Transient grating measurement directly detected the diffusion process of the proton and its diffusion coefficient was obtained to be 3.9 x 10(-9) m2 s(-1), which was several times larger than those of the usual solute molecules.
Saotome
Mie
M
Division of Frontier Materials Science, Graduate School of Engineering Science, and Research Center of Materials Science at Extreme Conditions Osaka University, Toyonaka, Osaka, 560-8531, Japan.
Takano
Satoko
S
Tokushima
Asako
A
Ito
Syoji
S
Nakashima
Satoru
S
Nagasawa
Yutaka
Y
Okada
Tadashi
T
Miyasaka
Hiroshi
H
D000143:Acids / Q000737:chemistry; D007094:Imides / Q000737:chemistry* / Q000528:radiation effects; D007700:Kinetics; D007834:Lasers; D008698:Mesylates / Q000737:chemistry* / Q000528:radiation effects; D053644:Naphthalimides; D010777:Photochemistry; D010782:Photolysis; D012996:Solutions / Q000737:chemistry*; D013053:Spectrophotometry / Q000295:instrumentation / Q000379:methods; D013997:Time Factors
D000143:Acids; D007094:Imides; D008698:Mesylates; C499982:N-trifluoromethylsulfonyloxy-1,8-naphthalimide; D053644:Naphthalimides; D012996:Solutions