Abstract
The reactivity and spectroscopic characteristics of the 1-azaxanthone triplet state in aqueous solutions indicate that inversion of states in the triplet manifold occurs in this solvent. Both the reactivity and spectroscopy of 1-azaxanthone suggest a predominantly π,π* character for the lowest triplet state in aqueous solutions, in contrast with organic solvents where 1-azaxanthone has n,π* character, even in polar media. The pH-dependent properties of the 1-azaxanthone triplet and its ketyl radical were examined. Despite the high reactivity of 1-azaxanthone toward photoreduction in organic solvents, in micellar systems the generation of ketyl radicals is inefficient. Studies of magnetic field effects on radical-pair behavior reveal similar characteristics to those observed with other carbonyl compounds, where geminate reaction and micellar exit are competing processes.
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