Physical Triplet Quenching by Electron Donors

Abstract

Absolute radical yields, as determined by flash spectroscopy, are reported for the reaction of the thionine triplet 3TH+ and its protonated form 3TH2++ with a variety of electron donors in methanolic solution. The different yields, extrapolated to infinite donor concentrations, are due to partial physical quenching of the triplets in the electron transfer reaction. The results are indicative of a triplet exciplex as an intermediate in the electron transfer reaction. © 1976, Verlag der Zeitschrift für Naturforschung. All rights reserved.