| | 1 | Author
| Norio Miyoshi, Giiti Tomita | Requires cookie* | | | Title
| Fluorescein-Photosensitized Furan Oxidation in Methanolic and Reversed Micellar Solutions, Part I Effects of Amines  | | | | Abstract
| The 1,3-diphenylisobenzofuran oxidation reaction was investigated in methanolic and dodecylammonium propionate reversed micellar solutions using fluorescein sodium as photosensitizer. It was found that aniline remarkably enhanced the furan oxidation in methanolic solutions but inhibited it in reversed micellar solutions. This enhancement effect occurred more effectively at lower oxygen concentrations. It was proposed that, in the former solutions, the radical mechanism (Type I) might be involved in the furan oxidation in the presence of aniline besides singiet oxygen mechanism (Type II). The reversed micelle seems to inhibit the Type I reaction, resulting in no enhancement of the furan oxidation by aniline. | | | |
Reference
| Z. Naturforsch. 34b, 1552—1555 (1979); received June 19 1979 | | | |
Published
| 1979 | | | |
Keywords
| Singlet Oxygen, Radicals, Fluorescein, Diphenylisobenzofuran, Reversed Micelles | | | |
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| default:Reihe_B/34/ZNB-1979-34b-1552.pdf | | | | Identifier
| ZNB-1979-34b-1552 | | | | Volume
| 34 | |
| 2 | Author
| Norio Miyoshi, Giiti Tomita | Requires cookie* | | | Title
| Fluorescein-photosensitized Furan Oxidation in Methanolic and Reversed Micellar Solutions, Part II Kinetic Analysis | | | | Abstract
| The 1,3-diphenylisobenzofuran oxidation was investigated in methanolic and dodecyl-ammonium propionate reversed micellar solutions using fluorescein sodium as photo-sensitizer. The furan oxidation was caused by the singlet oxygen mechanism (Type II). Aniline enhanced remarkably the furan oxidation in methanolic solutions, but inhibited highly this oxidation in the reversed micellar solutions. This enhancement of the furan oxidation was considered to be brought about by the occurrence of a radical mechanism (Type I) besides Type II mechanism. No Type I reaction occurred in the micellar solutions. The rate constants concerning with both reaction processes were evaluated by kinetic analysis, employing various aryl-and alkyl-amines. The reaction mechanism of Type I and the quenching mechanism of singlet oxygen by amines were discussed from the relationship between the rate constants, and the ionization potential of amines and the solvent polarity. | | | |
Reference
| (Z. Naturforsch. 35b, 107—111 [1980]; received July 27 1979) | | | |
Published
| 1980 | | | |
Keywords
| Singlet Oxygen, Radicals, Fluorescein, Diphenylisobenzofuran, Reversed Micelles | | | |
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| default:Reihe_B/35/ZNB-1980-35b-0107.pdf | | | | Identifier
| ZNB-1980-35b-0107 | | | | Volume
| 35 | |
| 4 | Author
| Norio Miyoshi, Giiti Tomita | Requires cookie* | | | Title
| Buffer Action of Reversed Micelles | | | | Abstract
| The optical properties (absorption and fluorescence) of fluorescein sodium were investi-gated with changing the bulk pH value in aqueous, water-methanol mixed and dodecyl-ammonium propionate reversed micellar solutions. A strong buffer action was found in the reversed micellar solutions. The pKa values for the equilibrium between fluorescein mono-and di-anions in the ground and excited singlet states highly decreased in the reversed micellar solutions compared with those in non-micellar solutions. The micellar buffer action strongly affected the initial rate of the 1,3-diphenylisobenzofuran oxidation caused by the photosensitization of fluorescein. The buffer action was closely related to the solubilized water content. | | | |
Reference
| Z. Naturforsch. 35b, 736—740 (1980); received January 9 1980 | | | |
Published
| 1980 | | | |
Keywords
| Fluorescein, Reversed Micelles, Buffer Action, Solubilized Water | | | |
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| default:Reihe_B/35/ZNB-1980-35b-0736.pdf | | | | Identifier
| ZNB-1980-35b-0736 | | | | Volume
| 35 | |
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