The triplet-triplet extinction coefficients of seventeen compounds have been determined in cyclohexane and benzene at room temperature by a method involving energy transfer. Large changes in extinction coefficient at the wavelength maximum Îµ(λmax) were observed upon changing solvent from cyclohexane to benzene. Values of Îµ(λmax) were determined relative to a value of Îµ(λmax) for the ketyl radical (ϕ2ĊOH) of 3220 M–1 cm–1 in water, assuming no change of oscillator strength with solvent. A number of triplet transfer rates, and other reactivities of benzophenone triplet and ketyl radicals, were also estimated.
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Transactions of the Faraday Society
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