Abstract
Ultrafast pump-probe transient absorption spectroscopy was applied to study, return electron transfer in the areneBr atom charge transfer (CT) complexes. Ultrafast optical excitation of the charge transfer band, of the complex, yields an excited Franck-Condon state of the CT complex, which relaxes to form an ion pair. The rate of charge recombination between the bromide and arene cation strongly depends on arene concentration, indicating on efficient quenching of the ion pair by another donor molecule. The return electron transfer has been studied in various solvents. In general, the observed kinetics is nonexponential, with distribution of relaxation times from 1 ps to ∼1000 ps. The slowest component in the relaxation is attributed to charge recombination of the ion pair in an equilibrium configuration. The rate of charge recombination of the excited areneBr complex does not depend significantly on the donor strength.
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