@article{oai:kanazawa-u.repo.nii.ac.jp:00007911,
 author = {Takahashi, Kenji and Tezuka, Hiroaki and Kitamura, Shingo and Satoh, Toshifumi and Katoh, Ryuzi},
 issue = {8},
 journal = {Physical Chemistry Chemical Physics},
 month = {Jan},
 note = {The photochemistry of the benzophenone ketyl radical in D1 excited state, BPH(D1), was studied by means of two-color dual-pulse laser flash photolysis (355 and 532 nm) in a room-temperature ionic liquid, 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)amide (Bmim-TFSA), and in methanol. Upon excitation with the 532 nm pulse, BPH(D1) emitted strong fluorescence. The transient absorption and fluorescence spectra of BPH(D1) were measured with nanosecond and sub-nanosecond time resolution, respectively. The observed Stokes shift was 1700 cm-1 in Bmim-TFSA, and this shift was close to that in acetonitrile. The fluorescence lifetime of BPH(D1) was determined to be 5 ns in Bmim-TFSA, and again the value was close to that in acetonitrile. The rate constant of the reaction of BPH(D1) with CCl4 in Bmim-TFSA was determined to be (2.1 ± 0.4) × 109 M-1 s-1, which was 10 times the rate constant calculated on the basis of the bulk viscosity of Bmim-TFSA. The results are discussed in terms of the effective microscopic viscosity of the ionic liquid that was recently reported for the cage effect. © 2010 the Owner Societies., 金沢大学理工研究域自然システム学系},
 pages = {1963--1970},
 title = {Reactions of excited-state benzophenone ketyl radical in a room-temperature ionic liquid},
 volume = {12},
 year = {2010}
}