Mechanistic and Kinetic Aspects of Photosensitization in the Presence of Oxygen†§
| Autor: | Robert Mechin, Charles Tanielian, Claude Schweitzer, Rachid Seghrouchni |
|---|---|
| Rok vydání: | 2000 |
| Předmět: |
chemistry.chemical_classification
Photosensitizing Agents Free Radicals Singlet oxygen Alkene Radical chemistry.chemical_element Substrate (chemistry) General Medicine Photochemistry Biochemistry Oxygen Kinetics chemistry.chemical_compound chemistry Rose bengal Photooxygenation Physical and Theoretical Chemistry Methylene blue |
| Zdroj: | Photochemistry and Photobiology. 71:12 |
| ISSN: | 0031-8655 |
| DOI: | 10.1562/0031-8655(2000)071<0012:makaop>2.0.co;2 |
| Popis: | Determining whether the first step of photooxygenation is Type I or Type II is a necessary prerequisite in order to establish the mechanism of photodynamic action. But this distinction is not sufficient, because other processes, both consecutive and competitive, commonly participate in the overall mechanism. Thus, in both Type I and Type II reactions, the initial products are often peroxides that can break down and induce free radical reactions. These aspects of photosensitization are discussed and illustrated by sensitizer/substrate systems involving (1) only radical reactions (decatungstate/alkane) and (2) reactions of singlet oxygen occurring in competitive and consecutive processes and possibly followed by radical reactions (methylene blue/2'-deoxyguanosine). Two other previously investigated systems involving, respectively, a Type II interaction followed by radical processes (methylene blue/alkene) and Type II reactions, some of which being competitive or consecutive (rose bengal/alkene), are briefly reconsidered. |
| Databáze: | OpenAIRE |
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