QUANTUM YIELDS OF TRIPLET AND O2(1∆g) FORMATION OF 4-THIOURIDINE IN WATER AND ACETONITRILE
| Autor: | René V. Bensasson, Robert W. Redmond, M Rougee, Silvia E. Braslavsky, Christian Salet, Alain Favre, Klaus Heihoff |
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| Rok vydání: | 1990 |
| Předmět: |
Aqueous solution
Chemistry Quantum yield chemistry.chemical_element General Medicine Photochemistry Biochemistry Oxygen chemistry.chemical_compound Molecule High Energy Physics::Experiment Singlet state Physics::Chemical Physics Physical and Theoretical Chemistry Triplet state Phosphorescence Acetonitrile |
| Zdroj: | Photochemistry and Photobiology. 51:635-641 |
| ISSN: | 0031-8655 |
| DOI: | 10.1111/php.1990.51.6.635 |
| Popis: | The quantum yield of triplet formation, phi T, and that of the photosensitized formation of singlet molecular oxygen, phi delta, were determined for a rare nucleoside, 4-thiouridine (4t-Urd), in water and in acetonitrile, using singlet molecular oxygen phosphorescence, laser-induced optoacoustics and time-resolved thermal lensing. These yields, phi T and phi delta, the latter in aerated solutions, were found to be, respectively, in water: 0.67 +/- 0.17 and 0.18 +/- 0.04 and in acetonitrile: 0.61 +/- 0.15 and 0.50 +/- 0.20. The fraction of the 4t-Urd triplet molecules quenched by oxygen leading to singlet molecular oxygen, S delta, was calculated to be between 0.7 and unity in both solvents, this value being indicative of a pi pi*character for the lowest triplet state of 4t-Urd. |
| Databáze: | OpenAIRE |
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