Photoinduced Cation Translocation in a Calix 4 biscrown: Towards a New Type of Light-Driven Molecular Shuttle

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TitrePhotoinduced Cation Translocation in a Calix 4 biscrown: Towards a New Type of Light-Driven Molecular Shuttle
Type de publicationJournal Article
Nouvelles publications2010
AuteursValeur B, Leray I, Zhao LY, Souchon V, Metivier R, Plaza P, Ley C, Lacombat F, Martin MM
JournalChemphyschem
Volume11
Fascicule11
Pagination2416-2423
Année de publicationAug
Numéro1439-4235
Accession NumberISI:000281061500020
Résumé

The photophysics of a ditopic receptor of potassium ion consisting of a 1,3-alternate calix[4]biscrown with a merocyanine dye (DCM) inserted into each crown is reported. Thanks to the large difference between the binding affinity for one and two potassium ions, one can find relative total concentrations of ligand and potassium ion at which the 1:1 complex is most predominant with respect to the free ligand and the 2:1 complex whose amounts are a few percents. Investigation of the 1:1 complex by femtosecond transient absorption spectroscopy provides evidence for the ultrafast movement of a potassium ion through the calix[4]arene tube upon excitation at 400 nm of the dye. Phototranslocation occurs in the picosecond timescale with a non-exponential kinetics without competition with photoejection towards the bulk. The translocation time includes two main short components: 0.83 ps and 10 ps. A smaller-weighted third component of 101 ps might include a competition between phototranslocation and excitation energy transfer as shown by using Forster's theory. These findings open the way to new strategies for light-driven molecular shuttles with the aim of information storage and binary logic computing at a nanometric scale.

URL<Go to ISI>://000281061500020
DOI10.1002/cphc.201000118
Importer un fichierPhotoinduced Cation Translocation in a Calix 4 biscrown: Towards a New Type of Light-Driven Molecular Shuttle
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