PHOTOELECTROCHEMICAL ELECTRON-SPIN RESONANCE .3. THE REDUCTION OF FLUORESCEIN - A PHOTO-DISP2 REACTION
The reduction of the dye fluorescein in an aqueous solution of high pH (13), at mercury-plated electrodes, has been investigated using in situ electrochemical e.s.r. and a channel electrode flow cell. In the dark, a simple reversible one-electron reduction is observed leading to the formation of the...
| Main Authors: | , , |
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| Format: | Journal article |
| Language: | English |
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1988
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| _version_ | 1797065061990137856 |
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| author | Compton, R Coles, B Pilkington, M |
| author_facet | Compton, R Coles, B Pilkington, M |
| author_sort | Compton, R |
| collection | OXFORD |
| description | The reduction of the dye fluorescein in an aqueous solution of high pH (13), at mercury-plated electrodes, has been investigated using in situ electrochemical e.s.r. and a channel electrode flow cell. In the dark, a simple reversible one-electron reduction is observed leading to the formation of the stable semi-fluorescein radical anion. On irradiation with 390 nm light, appreciable photocurrents are observed and the process takes on the characteristics of a DISP reaction with the formation of leucofluorescein: the two-electron reduction product. Analysis of the e.s.r. signal-photocurrent-solution flow-rate data allows the precise mechanism of the reaction to be deduced, and this is shown to involve a rate-determining electron transfer between excited and ground-state semi-fluorescein molecules. |
| first_indexed | 2024-03-06T21:23:15Z |
| format | Journal article |
| id | oxford-uuid:4232923e-ffc4-46fd-87f4-18d320f5c364 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-06T21:23:15Z |
| publishDate | 1988 |
| record_format | dspace |
| spelling | oxford-uuid:4232923e-ffc4-46fd-87f4-18d320f5c3642022-03-26T14:48:04ZPHOTOELECTROCHEMICAL ELECTRON-SPIN RESONANCE .3. THE REDUCTION OF FLUORESCEIN - A PHOTO-DISP2 REACTIONJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:4232923e-ffc4-46fd-87f4-18d320f5c364EnglishSymplectic Elements at Oxford1988Compton, RColes, BPilkington, MThe reduction of the dye fluorescein in an aqueous solution of high pH (13), at mercury-plated electrodes, has been investigated using in situ electrochemical e.s.r. and a channel electrode flow cell. In the dark, a simple reversible one-electron reduction is observed leading to the formation of the stable semi-fluorescein radical anion. On irradiation with 390 nm light, appreciable photocurrents are observed and the process takes on the characteristics of a DISP reaction with the formation of leucofluorescein: the two-electron reduction product. Analysis of the e.s.r. signal-photocurrent-solution flow-rate data allows the precise mechanism of the reaction to be deduced, and this is shown to involve a rate-determining electron transfer between excited and ground-state semi-fluorescein molecules. |
| spellingShingle | Compton, R Coles, B Pilkington, M PHOTOELECTROCHEMICAL ELECTRON-SPIN RESONANCE .3. THE REDUCTION OF FLUORESCEIN - A PHOTO-DISP2 REACTION |
| title | PHOTOELECTROCHEMICAL ELECTRON-SPIN RESONANCE .3. THE REDUCTION OF FLUORESCEIN - A PHOTO-DISP2 REACTION |
| title_full | PHOTOELECTROCHEMICAL ELECTRON-SPIN RESONANCE .3. THE REDUCTION OF FLUORESCEIN - A PHOTO-DISP2 REACTION |
| title_fullStr | PHOTOELECTROCHEMICAL ELECTRON-SPIN RESONANCE .3. THE REDUCTION OF FLUORESCEIN - A PHOTO-DISP2 REACTION |
| title_full_unstemmed | PHOTOELECTROCHEMICAL ELECTRON-SPIN RESONANCE .3. THE REDUCTION OF FLUORESCEIN - A PHOTO-DISP2 REACTION |
| title_short | PHOTOELECTROCHEMICAL ELECTRON-SPIN RESONANCE .3. THE REDUCTION OF FLUORESCEIN - A PHOTO-DISP2 REACTION |
| title_sort | photoelectrochemical electron spin resonance 3 the reduction of fluorescein a photo disp2 reaction |
| work_keys_str_mv | AT comptonr photoelectrochemicalelectronspinresonance3thereductionoffluoresceinaphotodisp2reaction AT colesb photoelectrochemicalelectronspinresonance3thereductionoffluoresceinaphotodisp2reaction AT pilkingtonm photoelectrochemicalelectronspinresonance3thereductionoffluoresceinaphotodisp2reaction |