The interaction between the excited triplet state of ketones and olefins: the role of triplet exciplexes

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Abstract
The quenching of triplet acetone in degassed acetonitrile solution by electron-rich and electron-deficient olefins has been measured by flash emission technique. With the exception of fumaronitrile, the efficiency of quenching of triplet ketones by olefins is not determined by the triplet energy of the ketone, but by the ability of the excited ketone to donate or accept electrons. The results are consistent with the assumption that back dissociation of the triplet exciplex is an important process in the overall reaction and accounts for quenching rate constants which are less than those for diffusion-controlled reactions. Lifetimes and binding energies of the triplet exciplexes have been estimated.

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