highlight 2 2017

Previous investigations on chiral recognition in photoinduced bimolecular electron transfer (ET) processes were inconclusive because diffusion was the rate-limiting step of the fluorescence quenching. However, measurements with a ~100 fs resolution give access to the static, diffusion-free, stage of the ET quenching. The left figure shows an acceleration of the nanosecond-resolved fluorescence dynamics of a chiral fluorophore (F) upon addition of a chiral electron donor (Q), pointing to an efficient ET quenching. The early dynamics (right panel) are strongly non-exponential and dominated by static quenching. It is the same independent of whether the (+), the (-) or the racemic forms of the fluorophore react with the (-)-form of Q. The absence of chiral recognition has important implications on the mechanism of this widespread reaction.

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Eric Vauthey

Physical Chemistry Department - Sciences II - University of Geneva
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