ChemInform Abstract: CHARGE‐TRANSFER MECHANISM FOR QUENCHING OF THE LOWEST 3N,Π* STATE OF VAPOR‐PHASE CARBONYL‐CONTAINING COMPOUNDS BY OXYGEN

Cebul, Frank A.; Kirk, Ken A.; Lupo, D. W.; Pittenger, L. M.; Schuh, Merlyn D.; Williams, Ifor R.; Winston, G.

doi:10.1002/chin.198046052

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“…Interestingly, both pathways contribute to the formation of O 2 (1Δ g ). The strong effect of increasing CT interactions on k T Q and SΔ was further corroborated by Cebul et al (25), Smith (26), Grewer and Brauer (27,28), and Darmanyan et al (29).…”

Section: Discussionmentioning

confidence: 55%

Photosensitized Generation of Singlet Oxygen

Schmidt

2007

Photochemistry and Photobiology

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This work gives an overview of what is currently known about the mechanisms of the photosensitized production of singlet oxygen. Quenching of ππ* excited triplet states by O2 proceeds via internal conversion of excited encounter complexes and exciplexes of sensitizer and O2. Both deactivation channels lead with different efficiencies to singlet oxygen generation. The balance between the deactivation channels depends on the triplet‐state energy and oxidation potential of the sensitizer, and on the solvent polarity. A model has been developed that reproduces rate constants and efficiencies of the competing processes quantitatively. Sensitization by excited singlet states is much more complex and hence only qualitative rules could be elaborated, despite serious efforts of many groups. However, the most important deactivation paths of fluorescence quenching by O2 are again directed by excess energies and charge‐transfer interactions similar to triplet‐state quenching by O2. Finally, two recent developments in photo‐sensitization of singlet oxygen are reviewed: Two‐photon sensitizers with particular application potential for photodynamic therapy and fluorescence imaging of biological samples and singlet oxygen sensitization by nanocrystalline porous silicon, a material with very different photophysics compared to molecular sensitizers.

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Section: Discussionmentioning

confidence: 55%

Photosensitized Generation of Singlet Oxygen

Schmidt

2007

Photochemistry and Photobiology

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ChemInform Abstract: CHARGE‐TRANSFER MECHANISM FOR QUENCHING OF THE LOWEST 3N,Π* STATE OF VAPOR‐PHASE CARBONYL‐CONTAINING COMPOUNDS BY OXYGEN

Cited by 1 publication

References 1 publication

Photosensitized Generation of Singlet Oxygen

Photosensitized Generation of Singlet Oxygen

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