title: Picosecond-nanosecond laser photolysis studies of a photoacid generator in solutions: Transient absorption spectroscopy and transient grating measurements.
abstract: 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.
authors.affiliation: 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.
authors.forename: Mie
authors.initials: M
authors.lastname: Saotome
authors.forename: Satoko
authors.initials: S
authors.lastname: Takano
authors.forename: Asako
authors.initials: A
authors.lastname: Tokushima
authors.forename: Syoji
authors.initials: S
authors.lastname: Ito
authors.forename: Satoru
authors.initials: S
authors.lastname: Nakashima
authors.forename: Yutaka
authors.initials: Y
authors.lastname: Nagasawa
authors.forename: Tadashi
authors.initials: T
authors.lastname: Okada
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Miyasaka
mesh_terms: 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
chemical_list: D000143:Acids; D007094:Imides; D008698:Mesylates; C499982:N-trifluoromethylsulfonyloxy-1,8-naphthalimide; D053644:Naphthalimides; D012996:Solutions