Quenching of triplet benzophenone by 2,4,6-tri-tert-butylphenol and formation of its phenoxy radical

Journal Article · Thu May 21 04:00:00 EDT 1987 · J. Phys. Chem.; (United States)

DOI:https://doi.org/10.1021/j100295a029· OSTI ID:6508625

Kajii, Y; Fujita, M; Hiratsuka, H; Obi, K; Mori, Y; Tanaka, I

Quenching of triplet benzophenone in benzene by 2,4,6-tri-tert-butylphenol is studied by the nanosecond laser flash photolysis. The quenching rate constant of triplet benzophenone has been determined to be 6.2 x 10/sup 8/ M/sup -1/ s/sup -1/, which is slightly smaller than the diffusion-controlled limit. The quenching reaction produces benzophenone ketyl and 2,4,6-tri-tert-butylphenoxy radicals simultaneously. The transient spectrum of the latter radical shows characteristic structured bands around 400 nm and a broad absorption between 600 and 700 nm. The extinction coefficient at the peak lambda/sub max/ = 670 nm of red absorption has been estimated to be 1200 M/sup -1/ cm/sup -1/.

• Research Organization: Tokyo Institute of Technology, Japan
• OSTI ID: 6508625
• Journal Information: J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 91:11; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400500* -- Photochemistry
500200 -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
ABSORPTION SPECTRA
AROMATICS
BENZOPHENONE
CHEMICAL PREPARATION
CHEMICAL REACTIONS
DATA
DE-EXCITATION
DECOMPOSITION
ENERGY TRANSFER
ENERGY-LEVEL TRANSITIONS
EXCIMER LASERS
EXPERIMENTAL DATA
GAS LASERS
HYDROXY COMPOUNDS
INFORMATION
KETONES
LASERS
MULTIPLETS
NUMERICAL DATA
ORGANIC COMPOUNDS
PHENOLS
PHENOXY RADICALS
PHOTOCHEMICAL REACTIONS
PHOTOLYSIS
RADIATIONLESS DECAY
RADICALS
SPECTRA
SYNTHESIS
TIME DEPENDENCE
TRIPLETS
VISIBLE SPECTRA