A study of the photolysis of the aqueous thymine system at 214 nm, 229 nm and 254 nm Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/3f462895s

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  • The photolysis of the aqueous thymine system has been investigated at 214 nm, 229 nm and 254 nm at room temperature. Products of photolysis have been identified as hydrogen peroxide, 6-hydroxy-5- hydroperoxy thymine and tentatively 5-hydroxy-6-hydroperoxy thymine. These together with thymine loss, were determined quantitatively under a variety of conditions. A primary process and mechanism of photolysis have been deduced. Identical photoproducts were produced at all the wavelengths used. Oxygen is necessary for the formation of these products. The results are consistent with a triplet state of thymine being the precursor to the photoproducts, the reaction being initiated by electron transfer from excited thymine to oxygen. We conclude that photooxidation is not a property of a specific absorption band. Variation of quantum yield with wavelength are discussed in terms of intersystem crossing from higher excited singlet states to higher triplet states.
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  • File scanned at 300 ppi using ScandAll PRO 1.8.1 on a Fi-6770A in PDF format. CVista PdfCompressor 5.0 was used for pdf compression and textual OCR.
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  • description.provenance : Made available in DSpace on 2014-03-03T16:51:54Z (GMT). No. of bitstreams: 1 SatcherRobertL1971.pdf: 2397101 bytes, checksum: f7c211a92ebe2956aa791de1baa6ed9d (MD5) Previous issue date: 1971-05-07

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