Tuning Surface Chirality of Adsorbed Gly-Pro Dipeptide/Cu(110) by Changing its Chemical Form via Electrospray Deposition.

Abstract : By changing the Ultra High Vacuum (UHV) deposition method, classical sublimation versus electrospray ionization, one can tune the chemistry of a chiral dipeptide molecule (Gly-Pro, GP), when adsorbed on a Cu(110) surface, from anionic to zwitterionic, respectively. This chemical shift will influence the adsorption mode of the dipeptide; either in a three-point fashion in the case of anionic GP molecules with a strong interaction between the copper surface, both O atoms of the carboxylate moiety and the nitrogen atoms, while in the case of zwitterions GP, the adsorption mode relies on the sole interaction of 1 carboxylate oxygen atom. These different anchoring modes strongly modify the expression of surface 2D chirality and the supramolecular assemblies with two very distinct unit cells.
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Christophe Méthivier, Hervé Cruguel, Dominique Costa, Claire-Marie Pradier, Vincent Humblot. Tuning Surface Chirality of Adsorbed Gly-Pro Dipeptide/Cu(110) by Changing its Chemical Form via Electrospray Deposition.. Langmuir, American Chemical Society, 2016, 32 (51), pp.13759-13763. ⟨10.1021/acs.langmuir.6b03553⟩. ⟨hal-01401619⟩

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