Photosensitization without oxygen

Photosensitized reaction occurs in the presence of light and photosensitizers with or without oxygen. A sensitizer, such as chlorophyll, rose bengal, or methylene blue, can ab-... 

Surface water photolysis t,2 = 4.4 h near surface water, t,/2 = 13 d and 68 d in 5-m deep water body without and with sediment-water partitioning in full summer day, 40°N photosensitized oxygenation t,/2 = 2.6 h at near surface water, 40°N, midday, midsummer (Zepp Schlotzhauer 1979) t,/2 4.4-13 h, based on photolysis half-life in water (Howard et al. 1991) ... 

Values for Polymer and Model Compounds. 1,4-Polyisoprene and 1,4-polybutadiene are so sufficiently reactive toward singlet oxygen that we can conveniently obtain / -values by three methods (a) from oxygen-uptake rates by photosensitized oxidation at different polymer concentrations (b) by the initial disappearance rate of rubrene on photooxygenation of solutions with and without polymer (or model olefin) and (c) for 1,4-polyisoprene, by the amount of rubrene consumed upon addition of aliquots of triphenyl phosphite ozonide in the presence and absence of olefin or polymer. The treatment of data from methods (b) and (c) was modified to give /3-values directly from the following equations ... 

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