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Recently, a modified form of the steady state treatment for the determination of excited state proton transfer rate constants was successfully applied to a variety of oxygen-and nitrogen-center aromatic excited-state acids. These compounds shared the characteristic of being more acidic in the first excited state, S1, than in the ground state, S0, and of requiring a concentrated mineral acid medium for protonation. The quantitation of excited-state proton transfer kinetics is presently extended to several protonated N-heterocyclic amines that are weak enough bases in the excited state to require concentrated mineral acids for protonation.
Kinetics, fluorescence efficiency, proton transfer, conjugate acid, conjugate base, monocation, dication, 2-aminoquinoline, 4-aminoquinaldine, 9-aminoacridine
College of Pharmacy, University of Florida, Gainesville, FL