A pulse radiolysis and pulsed laser study of the pyrromethene 567 triplet state |
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Authors: | A A Gorman I Hamblett T A King M D Rahn |
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Institution: | a Department of Chemistry, University of Manchester, Manchester M13 9PL, UK b Department of Physics and Astronomy, University of Manchester, Manchester M13 9PL, UK |
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Abstract: | The triplet state of pyrromethene 567, a molecule with potential as a solid state laser dye, has been characterized in benzene by pulse radiolysis in terms of its absorption spectrum, lifetime, self-quenching, electronic excitation energy, triplet–triplet extinction coefficient and oxygen quenching rate constant. The use of laser flash photolysis has then allowed determination of the triplet quantum yield, efficiency of formation of singlet oxygen (1Δg), and the rate constant for reaction of the latter species with the ground state. The affects of oxygen on the fluorescence and triplet yields demonstrate that oxygen-induced intersystem crossing is important, the sum of these parameters being unity within experimental error. The mechanism of reaction of P-567 with 1Δg in benzene is predominantly physical in character with only a small ( 6%) contribution from chemical reaction. |
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Keywords: | Pyrromethane 567 Dye fading Triplet states Singlet oxygen Chemical quenching |
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