We are investigating salt effect on the cage escape yield (ΦCE) in photoinduced bimolecular electron transfer. To obtain quantitative information, we use a donor-acceptor pair whose ions exhibit distinct spectral signatures and known exctinction coefficients. The two figures show transient absorption spectra recorded 500 ns after excitation of the electron acceptor without and with added salt in high- and medium-polar solvents. Whereas addition of salt has no marked influence in a highly-polar solvent, a strong effect can be observed in a medium-polar environment. This result highlights the importance of electrostatic screening for cage escape and how salts can be used to fine tune the effective polarity of the medium.
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Eric Vauthey
Physical Chemistry Department - Sciences II - University of Geneva
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