P121
Ultrafast electron transfer in tetracyanoethylene complexes with benzene and toluene.
Wlodzimierz Jarzeba,
Shigeo Murata*,
M. Tachiya*
Jagiellonian University, (*)NIMC
The ultrafast spectroscopy of the electron donor-acceptor complexes of tetracyanoethylene with benzene
and toluene has been investigated in polar and nonpolar solvents. After ultrafast excitation of the charge
transfer band, formation of the contact ion pair is observed. The decay time of the contact ion pair is
observed on a time scale from 1 ps to 1 ns depending on the solvent. In this study we present dependence of
the back electron transfer rate on the driving force for the TCNE-benzene and TCNE-toluene systems in
different solvents. The absolute rate constants for the nonradiative return electron transfer in nonpolar
solvents can be predicted using a coventional nonadiabatic theory of electron transfer and information from
the analysis of the fluorescence spectra of the complexes. The rate constants in polar solvents are obtained
applying the empirical polarity scale based on the dynamic Stokes shift of coumarin 153.
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