Abstract
Abstract The rate constants for quenching of the triplet states of eosin and erythrosin (3D*) with various substrates have been evaluated using nanosecond laser flash photolysis while observing the transient absorption bands in the visible/near-IR regions. Intense transient absorption bands due to 3D* were observed at about 1040 nm. An energy-transfer reaction from 3D* to anthracene-9-carboxylic acid was confirmed by the appearance of the absorption band of the triplet state of the acid at 425 nm. The ion radicals of electron donors and electron acceptors were also observed with the decay of 3D*, indicating the occurrence of an electron-transfer reaction. High hydrogen-abstraction abilities of 3D* were also confirmed for substituted phenols and benzenethiols. The negative slopes of the Hammett plots indicate that the reaction center of 3D* has a highly electrophilic nature.
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