Photochemical studies of a photodissociative initiator based on a benzophenone derivative possessing a thioether moiety

S-(4-Benzoyl)phenylthiobenzoate (BpSBz) and 4-benzoyl-phenyl benzoate (BpOBz) in acetonitrile were photolyzed under steady-state and laser-flash conditions. Analysis of transients absorptions and final products from the photolysis of BpSBz showed that 4-benzoylphenylthiyl and 4-benzoyl radicals were...

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Bibliographic Details
Published in:Journal of photochemistry and photobiology. A, Chemistry. Chemistry., 2003-02, Vol.155 (1), p.253-259
Main Authors: Wrzyszczynski, Andrzej, Bartoszewicz, Jarogniew, Hug, Gordon L., Marciniak, Bronislaw, Paczkowski, Jerzy
Format: Article
Language:English
Subjects:
BpOBz
BpSBz
Chemistry
Exact sciences and technology
General and physical chemistry
Laser-flash
Photochemistry
Physical chemistry of induced reactions (with radiations, particles and ultrasonics)
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Summary:S-(4-Benzoyl)phenylthiobenzoate (BpSBz) and 4-benzoyl-phenyl benzoate (BpOBz) in acetonitrile were photolyzed under steady-state and laser-flash conditions. Analysis of transients absorptions and final products from the photolysis of BpSBz showed that 4-benzoylphenylthiyl and 4-benzoyl radicals were formed with an initial quantum yield of 0.45. Benzaldehyde was the main final product. In contrast, photolysis of BpOBz did not yield benzaldehyde, and nanosecond laser-flash photolysis of BpOBz showed only a long-lived triplet state. These results suggest that CO bond cleavage does not occur as a primary photochemical reaction of BpOBz. The implications for the use of BpSBz as a photoinitiator of polymerization are discussed.
ISSN:1010-6030
1873-2666
DOI:10.1016/S1010-6030(02)00391-X