Triplet state mechanism for electron transfer oxidation of DNA

Ma, Jin; Wang, Lin; Wang, Wenfeng; Han, Zhewen; Yao, Side; Lin, Nianyun

doi:10.1016/s1011-1344(00)00081-6

Cited by 29 publications

(21 citation statements)

References 32 publications

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“…The behavior of C at 370 nm is found to be intermediate between T and U. In this MQ-C interaction, again both HA and ET have been discerned as MQH d , MQ dÀ and C d+ ($480 nm) [22,23] could be detected. In order to explain the intermediate behavior of C at 370 nm, we have to consider an intermediate ET and/or HA of C than T and U.…”

Section: Resultsmentioning

confidence: 78%

Interaction of quinones with three pyrimidine bases: A laser flash photolysis study

Bose

Basu

2009

Journal of Luminescence

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Section: Resultsmentioning

confidence: 78%

Interaction of quinones with three pyrimidine bases: A laser flash photolysis study

Bose

Basu

2009

Journal of Luminescence

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“…A triplet-triplet absorption for various Ade (25,28) and Gua (29,35) derivatives has not been detected upon their direct excitation with microsecond or nanosecond flash photolysis. But triplet absorption signals have been observed in the 380-470 nm wavelength region in experiments where the triplets were produced by photosensitization (65)(66)(67). PI from a singlet state has been demonstrated for 6-MP and the purine-free base (14).…”

Section: Mechanism Of Pi For the Dna And Rna Bases At 266 Nm Nanosecomentioning

confidence: 99%

Photoionization of DNA and RNA Bases, Nucleosides and Nucleotides Through a Combination of One- and Two-photon Pathways upon 266 nm Nanosecond Laser Excitation¶

Crespo‐Hernández

Arce

2002

Photochem Photobiol

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The 266 nm nanosecond laser photolysis of various purine and pyrimidine derivatives results in their photoionization (PI) as one of the primary photochemical pathways. Electron photoejection occurs through a combination of one- and two-photon mechanisms. The PI values depend on the substituents attached to the chromophore of the base. The net PI of the purine bases at 266 nm are of the same order of magnitude (10(-2)) as those of the pyrimidine bases under similar experimental conditions. The monophotonic component is approximately one-third of the net PI yield of the bases. A nonrelaxed singlet excited state intermediate is tentatively proposed for this pathway. It is proposed that this state is significantly stabilized by water solvation, transforming it into a charge transfer to solvent state from which the hydrated electron evolves.

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“…A triplet–triplet absorption for various Ade (25,28) and Gua (29,35) derivatives has not been detected upon their direct excitation with microsecond or nanosecond flash photolysis. But triplet absorption signals have been observed in the 380–470 nm wavelength region in experiments where the triplets were produced by photosensitization (65–67). PI from a singlet state has been demonstrated for 6‐MP and the purine‐free base (14).…”

Section: Resultsmentioning

confidence: 99%

Photoionization of DNA and RNA Bases, Nucleosides and Nucleotides Through a Combination of One- and Two-photon Pathways upon 266 nm Nanosecond Laser Excitation¶

Crespo‐Hernández

Arce

2007

Photochemistry and Photobiology

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The 266 nm nanosecond laser photolysis of various purine and pyrimidine derivatives results in their photoionization (PI) as one of the primary photochemical pathways. Electron photoejection occurs through a combination of one‐ and two‐photon mechanisms. The PI values depend on the substituents attached to the chromophore of the base. The net PI of the purine bases at 266 nm are of the same order of magnitude (10−2) as those of the pyrimidine bases under similar experimental conditions. The monophotonic component is approximately one‐third of the net PI yield of the bases. A nonrelaxed singlet excited state intermediate is tentatively proposed for this pathway. It is proposed that this state is significantly stabilized by water solvation, transforming it into a charge transfer to solvent state from which the hydrated electron evolves.

show abstract

Triplet state mechanism for electron transfer oxidation of DNA

Cited by 29 publications

References 32 publications

Interaction of quinones with three pyrimidine bases: A laser flash photolysis study

Interaction of quinones with three pyrimidine bases: A laser flash photolysis study

Photoionization of DNA and RNA Bases, Nucleosides and Nucleotides Through a Combination of One- and Two-photon Pathways upon 266 nm Nanosecond Laser Excitation¶

Photoionization of DNA and RNA Bases, Nucleosides and Nucleotides Through a Combination of One- and Two-photon Pathways upon 266 nm Nanosecond Laser Excitation¶

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