Hydrogen Atom Transfer in the Quenching of Pyrene Fluorescence by Amines

Abstract
The mechanism of the quenching of pyrene fluorescence by primary and secondary amines has been studied by means of fluorescence measurements and transient absorption measurements with the use of laser photolysis as well as conventional flash photolysis methods. It has been confirmed that 1-hydro-1-pyrenyl radicals and amino radicals are produced in the course of the fluorescence quenching reaction. The relative yields of 1-hydro-1-pyrenyl radicals for various amine quenchers were estimated.