Charge recombination in excited donor-acceptor complexes with two absorption bands |
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Authors: | V N Ionkin A I Ivanov and E Vauthey |
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Institution: | (1) Volgograd State University, Vtoraya Prodol’naya ul. 30, Volgograd, 400062, Russia;(2) Geneva University, Geneva, Switzerland |
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Abstract: | The dynamics of charge recombination in a photoexcited donor-acceptor complex comprising 1,2,4-trimethoxybenzene (electron
donor) and tetracyanoethylene (electron acceptor) in several polar solvents (acetonitrile, valeronitrile, and octanonitrile)
was studied in terms of the stochastic approach. The Gibbs energy of charge recombination and the reorganization energies
of the medium and quantum and vibrational degrees of freedom were found by fitting the stationary absorption spectrum. The
electronic couplings were determined by analyzing the time dependences of the population of the ionic state in acetonitrile.
A comparison of the numerical simulation results with the experimental data showed that the nonstationary model under consideration
quantitatively described the dynamics of charge recombination and its dependence on the carrier frequency of excitation pulses
and the relaxation properties of solvents.
Original Russian Text ? V.N. Ionkin, A.I. Ivanov, E. Vauthey, 2009, published in Zhurnal Fizicheskoi Khimii, 2009, Vol. 83,
No. 4, pp. 791–797. |
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