SEDL / STP / STP1009-EB / STP19692S

Kinetics of Proton Transfer of Extremely Weak Bases in the Lowest Excited Singlet State in Concentrated Mineral Acid Solutions

Kelly, RN


Schulman, SG
College of Pharmacy, University of Florida, Gainesville, FL

Pages: 8    Published: Jan 1988

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Abstract

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.