Oxygen photochemistry

Allen, H. C J. M. Laux, R. Vogt, B. J. Finlayson-Pitts, and J. C. Hemminger, Water-Induced Reorganization of Ultrathin Nitrate Films on NaCI Implications for the Tropospheric Chemistry of Sea Salt Particles, J. Phys. Chem., 100, 6371-6375 (1996). Allen, M., and M. L. Delitsky, A Test of Odd-Oxygen Photochemistry Using Spacelab 3 Atmospheric Trace Molecule Spectroscopy Observations, J. Geophys. Res., 96, 12883-12891 (1991). 

Figure 58 Enamine reaction with singlet oxygen (photochemistry).

K-O Hwang and LA Lucia. Fundamental Insights into the Oxidation of Lignocellulosics Obtained From Singlet Oxygen Photochemistry. J Photochem Photobiol A Chem 168 205-209, 2004. 

Since most clinical photosensitizers are believed to operate through (Type II) singlet oxygen photochemistry, the availability of adequate free oxygen in the tissue is a prerequisite for photobiological effect. The oxygen dependence of PDT has a sharper onset than for ionizing radiation and the onset occurs at lower pO. ... 

Pratt AC Photoreactions of compounds containing heteroatoms other than oxygen. Photochemistry London Royal Society of Chemistry 2002, 33 242-306. 

Petrik NG, Kimmel GA (2011) Oxygen photochemistry on TiO2(110) recyclable, photoactive oxygen produced by annealing adsorbed O2. J Phys Chem Lett 2 2790-2796... 

Fig. 5. Chemistry of cyclized mbbei—bis-a2ide negative acting resist, (a) Preparation of cyclized mbber resin from polyisoprene (b) photochemistry of aromatic bis-a2ide sensiti2ers. The primary photoproduct is a highly reactive nitrene which may combine with molecular oxygen to form oxygenated products, or may react with the resin matrix by addition or insertion to form polymer—polymer linkages.

Photochemical Reactions. The photochemistry of chlorine dioxide is complex and has been extensively studied (29—32). In the gas phase, the primary photochemical reaction is the homolytic fission of the chlorine—oxygen bond to form CIO and O. These products then generate secondary products such as chlorine peroxide, ClOO, chlorine, CI2, oxygen, O2, chlorine trioxide [17496-59-2] CI2O2, chlorine hexoxide [12442-63-6] and... 

The high concentration of oxygen in the atmosphere plays a central role in the photochemistry and chemical reactivity of the atmosphere. Atmospheric oxygen also defines the oxidation reduction potential of surface waters saturated with oxygen. The presence of oxygen defines the speciation of many other aquatic species in surface waters. 

Michaeli, A. Feitelson, J. (1994). Reactivity of singlet oxygen toward amino acids and peptides. Photochemistry and Photobiology, Vol.59, No.3, (March 1994), pp. 284-289, ISSN 0031-8655. 

Montenegro, M.A. Nazareno, M.A Durantini, E.N. Borsarelli, G.D. (2002). Singlet oxygen quenching ability of carotenoids in a reverse micelle membrane mimetic system. Photochemistry and Photobiology, Vol. 75, No. 4, (April 2002), pp.353-361, ISSN 0031-8655... 

At low irradiances, photosynthesis uses virtually 100% of the quanta, but in full sunlight, about 2000 imol quanta s , more quanta are available than can be used in photochemistry. Maximum rates of photosynthesis by Populus or Spinacia leaves of 15 and 70 jumol O2 m s , respectively, would require only 15 x 9 = 135 to 630 jumol quanta m s , or 10-40%. Leaves, therefore, need to be able to dissipate 60-90% of the quanta at high irradiance in an orderly manner such as non-radiative decay if they are to avoid the potentially damaging formation of oxygen radicals from reduced ferredoxin (Asada Takahashi, 1987). When plants are under a stress that restricts CO2 assimilation, excessive light will be reached at even lower irradiances. 

Lindig BA and Rodgers MAJ. 1981. Rate parameters for the quenching of singlet oxygen by water-soluble and lipid-soluble substrates in aqueous and micellar systems. Photochemistry and Photobiology 33(5) 627-634. 

Bard, A.J. and Fox, M.A. (1995) Artificial photosynthesis solar splitting of water to hydrogen and oxygen. Accounts of Chemical Research, 28 (3), 141—145. Imahori, H., Mori, Y., and Matano, Y. (2003) Nanostructured artificial photosynthesis. Journal of Photochemistry and Photobiology C Photochemistry Reviews, 4 (1), 51-83. 

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