Abstract
A1TPP exhibits intense fluorescence and low-temperature phosphorescence for which the observed properties are entirely consistent with (ππ*) excited states of a diamagnetic metalloporphyrin. In contrast, the paramagnetic CrTPP does not show normal (ππ*) fluorescence, but instead extremely weak triplet-state fluorescence from a tripquartet state is observed at room temperature. The lifetime of this tripquartet state is 295 ps, and its deactivation involves population of a lower-energy tripsextet state which shows inefficient low-temperature phosphorescence. Since the two states are in thermal equilibrium, delayed triplet fluorescence is observed at room temperature.
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Schedule a callMore From: Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases
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