Singlet oxygen chemically

Schweitzer, C. and Schmidt, R. (2003) Physical mechanisms of generation and deactivation of singlet oxygen. Chemical Reviews, 103, 1685-1757. 

Hamon, M.A., Stensaas, K.L., Sugar, M.A., Tumminello, K.C. and Allred, A.K. (2007) Reacting soluble single-walled carbon nanotubes with singlet oxygen. Chemical Physics Letters, 447 (1-3), 1-4. 

Song, B., Wang, G.L., and Yuan, J.L. (2005) A new europium chelate-based phosphorescence probe specific for singlet oxygen. Chemical Communications, 3553—3555. 

Primer, A. A. Singlet Oxygen Chemical Rubber Company (CRC) Cleveland, OH, 1985 Vols. 1-4. 

Decomposition of adducts such as triphenyl phosphite—ozone provides a convenient method for accomplishing chemical oxidations involving singlet oxygen and making it a useful oxygenating agent for synthetic and mechanistic appHcations. 

Another type of chemical change is initiated by light, which may trigger autolytic, that is, free radical (Type I) or singlet oxygen (Type II) reactions. These changes are routinely classified as oxidation. Rancidity in cosmetics, especially those containing unsaturated Hpids, is commonly prevented by use of antioxidants (qv). 

Keywords Cycloadditions, Chemical orbital theory. Donor-acceptor interaction. Electron delocalization band. Electron transfer band, Erontier orbital. Mechanistic spectrum, NAD(P)H reactions. Orbital amplitude. Orbital interaction. Orbital phase. Pseudoexcitation band. Quasi-intermediate, Reactivity, Selectivity, Singlet oxygen. Surface reactions... 

Carotenoid chemical structure is usually not affected by the physical quenching. Another mechanism can occur in which a carotenoid chemically quenches singlet oxygen and is thus transformed in derived products. ... 

Fiedor, 1. et al., Cyclic endoperoxides of beta-carotene, potential pro-oxidants, as products of chemical quenching of singlet oxygen, Biochim. Biophys. Acta Bioenerg., 1709, 1, 2005. 

The same Chapter examines specific mefiiodolo cal tedmiques applicable to identify atoms of hydrogen, oxygen, silver, alkyl radicals, molecules of singlet oxygen in gaseous phase. These methods can be widely applicable for practical physical and chemical studies. 

Fig. 5.6. Changes in electrical resistance of ZnO film under the action of singlet oxygen at its chemical generation [66]. Arrow-heads indicate on/off switching...

Nevertheless, in the sensor study of heterogeneous reactions of singlet oxygen, it is better to employ selective sources that do not generate other active particles and produce though low, but stable concentrations of 02( ). These sources can be photochemical and chemical... 

Strong evidence in favor of mechanism B was obtained when it was discovered that singlet oxygen produced chemically by the reaction of hydrogen peroxide and sodium hydrochlorite or from gaseous oxygen excited by an electrodeless discharge yields the same products as the direct photolysis/85-8 ... 

Since the corresponding endoperoxide precursors are all too unstable for isolation, the diimide reduction constitutes an important chemical structure confirmation of these elusive intermediates that are obtained in the singlet oxygenation of the respective 1,3-dienes. However, the aza-derivative 14 and the keto-derivative 15 could not be prepared,17> because the respective endoperoxides of the pyrroles 18) and cyclopentadienones suffered complex transformations even at —50 °C, so that the trapping by the diimide reagent was ineffective. 

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