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| Content Provider | Royal Society of Chemistry (RSC) |
|---|---|
| Author | Gruen, Henry Görner, Helmut |
| Copyright Year | 2010 |
| Abstract | The photophysical and photochemical properties of violanthrone (V1) and two 16,17-R derivatives with R = OC8H17 and OCOC17H35 (V2 and V3, respectively) in solution were examined. The fluorescence quantum yield of V3 is Φf = 0.2, while that of V1 is low (0.01) and V2 even lower. A radical-induced reduction takes place in the presence of a photosensitizer, such as acetone, acetophenone or benzophenone, and an alcohol as donor. The reduction quantum yield in an argon-saturated solution, e.g. in 1-phenylethanol and glycerol triacetate, is close to unity. The products are the corresponding dihydroquinones (VH2s), which fluoresce strongly at 560–600 nm, Φf = 0.6–1, and undergo back-oxidation on the admission of oxygen. The flash photolysis of violanthrones in the presence of both sensitizer and donor reveals ketyl radicals after the pulse, the intermediacy of the semiquinone radicals (VH˙) at 650–750 nm and the formation of VH2s in the 0–1 ms range. |
| Starting Page | 1088 |
| Ending Page | 1093 |
| Page Count | 6 |
| File Format | HTM / HTML PDF |
| ISSN | 1474905X |
| Volume Number | 9 |
| Issue Number | 8 |
| Journal | Photochemical & Photobiological Sciences |
| DOI | 10.1039/c0pp00028k |
| Language | English |
| Publisher | Royal Society of Chemistry |
| Access Restriction | Open |
| Subject Keyword | Oxygen Fluorescence Glycerol Benzophenone Semiquinone Quantum Violanthrone Acetophenone Flash photolysis Photosensitizer Ketyl Photochemistry Acetone |
| Content Type | Text |
| Resource Type | Article |
| Subject | Physical and Theoretical Chemistry |
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