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The Figure shows contour plots obtained from time-resolved IR measurements of the bimolecular photoinduced electron transfer (ET) between a dicyanoanthracene acceptor and a trimethoxybenzene donor. The two bands originate from the antisymmetric C≡N stretching mode of the acceptor in the excited state (~2160 cm-1) and of its radical anion (~2145 cm-1). The results suggest that the build up of the ion band, hence ET, is faster in nonpolar than in polar solvents, contrary to what is generally expected. This counter-intuitive result can be accounted for in terms of different quenching mechanisms, depending on the solvent polarity.

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Eric Vauthey

Physical Chemistry Department - Sciences II - University of Geneva
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