Singlet excited oxygen

As discussed in Chapter 2, triplet excited anthracene transfers its energy to oxygen to produce singlet excited oxygen OA,). The singlet oxygen in turn attacks a ground state anthracene to form a 9,10-endoperoxide. 

Ozone absorbs in the near UV region and can therefore be decomposed by sunlight with the production of singlet (excited) oxygen 0 The details of the formation of the hydroxyl radicals, OH , are not yet clear, but these radicals lead to secondary processes with hydrocarbons, RH, and with S02 to produce final products like peroxides and sulfuric acid. 

K5. Krinsky, N. L, Singlet excited oxygen as a mediator of the antibacterial action of leukocytes. Science 186, 363-365 (1974). 

Singlet excited oxygen ( Ag) has been considered to convert alkenes into allylic hydroperoxides (246) by a concerted mechanism (247). It now seems likely that reaction occurs via a per-epoxide (248), which subsequently rearranges as... 

Land EJ (1991) Time-resolved luminescence-pulse radiolysis determination of the fractions of porphyrin photosensitizer triplets giving rise to singlet excited oxygen on quenching by ground state triplet oxygen. J Photochem Photobiol A Chem 61 165-170... 

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