Equilibrium pK^∗ of carbazole studied by the deprotonation reaction in ammoniacal aqueous media

Abstract

Forward and backward rate constants for the excited state deprotonation reaction of carbazole in ammoniacal aqueous media were determined from both steady state (Weller's fluorescence quenching technique) and direct kinetic studies. The results establish that the equilibrium pK^∗ may be significantly different from the "apparent" pK^∗ obtained by the fluorometric titration method.