THE INTERSYSTEM CROSSING KINETICS OF AROMATIC KETONES IN THE CONDENSED PHASE
Loading...
Date
1977
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Ohio State University
Abstract
The kinetics of the excited state absorption buildup of anthrone in room temperature solutions will be described Excitation with a 10 ps pulse at 355 nm produces an approximately exponential buildup of weak absorption at 533 nm in this solution. We assume that the triplet state of anthrone is responsible for this absorption and deduce an inverse first order rate constant of $ k^{-1} = 40\pm 10 $ ps for this process. Our result is shorter, but just within experimental error of recently reported absorption buildup kinetics at 400 nm in this $system.^{1}$ We will report the comparison of these results with our previous measurements of intersystem crossing kinetics in aromatic $ketones,^{2}$ as well as related systems. It will be shown that the rate constants are quite sensitive to the relative energies of the $^{1}n\Pi^{*}, ^{3}n\Pi^{*},$ and $^{3}n\Pi^{*}$ states in these molecules.
Description
$^{1}$T. Kobayashi and S. Nagakura, Chem. Phys. Lett, 43, 429 (1976). $^{2}$R. W. Anderson, Jr., R. M. Hochstrasser, H. Lutz, and G. W. Scott, Chem. Phys. Lett. 28, 153 (1974); Bull, Am. Phys, Soc, 20, 46 (1975).
Author Institution: Department of Chemistry, University of California
Author Institution: Department of Chemistry, University of California