title: Surface Chirality of Gly-Pro Dipeptide Adsorbed on a Cu(110) Surface.
abstract: The adsorption of chiral Gly-Pro dipeptide on Cu(110) has been characterized by combining in situ polarization modulation infrared reflection absorption spectroscopy (PM-RAIRS) and X-ray photoelectron spectroscopy (XPS). The chemical state of the dipeptide, and its anchoring points and adsorption geometry, were determined at various coverage values. Gly-Pro molecules are present on Cu(110) in their anionic form (NH2 /COO(-)) and adsorb under a 3-point binding via both oxygen atoms of the carboxylate group and via the nitrogen atom of the amine group. Low-energy electron diffraction (LEED) and scanning tunneling microscopy (STM) have shown the presence of an extended 2D chiral array, sustained via intermolecular H-bonds interactions. Furthermore, due to the particular shape of the molecule, only one homochiral domain is formed, creating thus a truly chiral surface.
authors.affiliation: Sorbonne Universités, UPMC Université Pierre et Marie Curie, Univ Paris 6, Paris, France.|Institut des NanoScience de Paris, Université Pierre et Marie Curie, UPMC Paris 6, Paris, France.
authors.forename: Hervé
authors.initials: H
authors.lastname: Cruguel
authors.affiliation: Sorbonne Universités, UPMC Université Pierre et Marie Curie, Univ Paris 6, Paris, France.|Laboratoire de Réactivité de Surface - UMR CNRS 7197, Université Pierre et Marie Curie, UPMC Paris 6, Paris, France.
authors.forename: Christophe
authors.initials: C
authors.lastname: Méthivier
authors.affiliation: Sorbonne Universités, UPMC Université Pierre et Marie Curie, Univ Paris 6, Paris, France.|Laboratoire de Réactivité de Surface - UMR CNRS 7197, Université Pierre et Marie Curie, UPMC Paris 6, Paris, France.
authors.forename: Claire-Marie
authors.initials: CM
authors.lastname: Pradier
authors.affiliation: Sorbonne Universités, UPMC Université Pierre et Marie Curie, Univ Paris 6, Paris, France.|Laboratoire de Réactivité de Surface - UMR CNRS 7197, Université Pierre et Marie Curie, UPMC Paris 6, Paris, France.
authors.forename: Vincent
authors.initials: V
authors.lastname: Humblot
mesh_terms: D003300:Copper / Q000737:chemistry*; D004151:Dipeptides / Q000737:chemistry*; D004583:Electrons; D016252:Microscopy, Scanning Tunneling / Q000379:methods; D056951:Photoelectron Spectroscopy / Q000379:methods; D013055:Spectrophotometry, Infrared / Q000379:methods; D013237:Stereoisomerism; D013499:Surface Properties
chemical_list: D004151:Dipeptides; C015248:glycylproline; D003300:Copper
keywords: Gly-Pro; homochiral domains; mirror symmetry; molecular chirality; scanning tunneling microscopy; surface chirality