Optical electron transfer for smart devices

In molecular computing how does structure influence electron transfer ?

In their Dalton Transactions Hot Article, Frederic Paul and his team look at the intramolecular electron transfer in a fluorenyl iron compound with a view to optimising mixed valent compounds for smart molecular devices.

Optical electron transfer through 2,7-diethynylfluorene spacers in mixed-valent complexes containing electron-rich “(η2-dppe)(η5-C5Me5)Fe” endgroups
Floriane Malvolti, Cedric Rouxel, Olivier Mongin, Philippe Hapiot, Loic Toupet, Mireille Blanchard-Desce and Frédéric Paul, Dalton Trans., 2011, DOI: 10.1039/C1DT10231A

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One Response to “Optical electron transfer for smart devices”

  1. Frederic Paul says:

    For several years, we have been interested in exploiting the redox-active “Fe(Cp*)(dppe)C≡C” endgroup(s) in various types of molecular devices based on intra-molecular electron transfer reactions or on magnetic exchange interactions, depending on its redox state.
    Accordingly, we usually try to investigate in a systematic way how structural modifications at the alkynyl end do affect the electronic “communication” of this particular endgroup with the rest of the molecule.
    As shown in this paper, the Hush model provides a simple and convenient means to extract an apparent electronic coupling from the intervalence band of symmetric mixed valent (MV) complexes. Albeit often criticized, we believe that the Hush model is still very useful for extracting structure-properties relationships in consistent series of MV compounds due to its relative simplicity, its strong “empiric” nature and its straightforwardness of application. Indeed, these apparent electronic coupling values allow for (at least) a “qualitative” comparison between various types of organic bridges, which constitute decisive information for experimentalists (like us), trying to design new molecular devices based on electron transfer and involving such a redox-active terminus.
    We thus hope that our present contribution will be of use to other groups working with related compounds or molecular devices.

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