Abstract
The temperature dependence of the bimolecular rate constant for O 2 ( 3 Σ g ) quenching of a series of aromatic hydrocarbon triplet states, κ T ox , has been determined in toluene. Highly curved Arrhenius plots were obtained, indicating a change in rate-determining step over the available temperature range. At low temperatures, κ T ox of all hydrocarbons approached a common limiting slope that was consistent with 4 / 9 κ d . At higher temperatures, low positive or negative activation energies were observed, indicating the involvement of exciplex intermediacy in the overall quenching process
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