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- W2013350339 abstract "Through the application of optically active second-harmonic generation measurements (OA-SHG) we have demonstrated that the adsorption of amino acids cysteine (HSCH2CHNH2COOH) and penicillamine (HSC(CH3)2CHNH2COOH) from solution can induce chiral electronic states in an initially achiral polycrystalline Au film. The chiral induction is strongly dependent upon the pH of the deposition solution; adsorption of penicillamine and cysteine under acidic conditions (pH = 3) induces the same level of optical activity, whereas at pH = 11, the optical activity induced by cysteine is reduced by ca. 50% and penicillamine does not induce optical activity at all. The pH dependence indicates that the presence of interadsorbate hydrogen bonds, and consequently the supramolecular assembly of the adsorbates, facilitates the induction of chiral electronic states in the Au surface. This observation demonstrates that the symmetry properties of the extended structure of the self-assembled layer, and not the local adsorption geometry of the isolated adsorbed moiety, play the lead role in the induction of chiral metallic electronic states. The dependence of the chiral induction on COOH groups is identical to that observed in studies of optical activity in chiral thiol-protected nanoparticles, suggesting a common mechanism for the chiral perturbation in extended films and nanoparticles." @default.
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- W2013350339 date "2007-07-28" @default.
- W2013350339 modified "2023-09-23" @default.
- W2013350339 title "Supramolecular Assembly Facilitating Adsorbate-Induced Chiral Electronic States in a Metal Surface" @default.
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- W2013350339 doi "https://doi.org/10.1021/jp074056s" @default.
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