Abstract
The localized photoexcitation of a Ru(II) polypyridine complex covalently attached by a flexible link to pyrene results in a rapid intramolecular transfer of triplet energy with a forward rate constant of (1.3 {+-} 0.3) x 10{sup 8} s{sup -1} in deaerated methanol solution. On account of the energetic proximity of the states, reverse transfer occurs with a rate constant lower by a factor of 18{+-} 3. This equilibiration is rapid compared with the relaxation processes that are deactivating the system, which have a common lifetime of 11.2 {+-}4 {mu}s. These results may be the first direct observation of an equilibrium being reached in an intramolecular triplet energy transfer reaction. 17 refs., 4 fig.
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