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Binding Geometry of Hydrogen-Bonded Chain Motif in Self-Assembled Gratings and Layers on Ag(111) (Articolo in rivista)

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Binding Geometry of Hydrogen-Bonded Chain Motif in Self-Assembled Gratings and Layers on Ag(111) (Articolo in rivista) (literal)

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J. Lipton-Duffin, J.A. Miwa, S. G. Urquhart, G. Contini, A. Cossaro, L. Casalis, J. V. Barth, L. Floreano, A. Morgante, F. Rosei (2012)
Binding Geometry of Hydrogen-Bonded Chain Motif in Self-Assembled Gratings and Layers on Ag(111)
in Langmuir; American Chemical Society, Washington (Stati Uniti d'America)
(literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori

J. Lipton-Duffin, J.A. Miwa, S. G. Urquhart, G. Contini, A. Cossaro, L. Casalis, J. V. Barth, L. Floreano, A. Morgante, F. Rosei (literal)

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+ Centre Énergie, Matériaux et Télécommunications, Institut National de la Recherche Scientifique, Université du Québec, 1650 Boulevard Lionel-Boulet, Varennes, QC, J3X 1S2, Canada ? Department of Chemistry, University of Saskatchewan, 110 Science Place, Saskatoon, SK S7N 5C9, Canada § Istituto di Struttura della Materia, CNR, Via Fosso del Cavaliere 100, 00133 Roma, Italy Centro interdipartimentale Nanoscienze & Nanotecnologie & Strumentazione (NAST), University of Rome \"Tor Vergata\", 00133 Roma, Italy CNR-IOM, Laboratorio TASC, Trieste, 34149 TS, Italy # Sincrotrone Trieste S.C.p.A., 34149 Trieste, Italy Department of Physics, University of Trieste, I-34127 Trieste, Italy Physik Department, Technische Universität München, James-Franck Straße, 185748 Garching, Germany (literal)

Titolo

Binding Geometry of Hydrogen-Bonded Chain Motif in Self-Assembled Gratings and Layers on Ag(111) (literal)

Abstract

Upon adsorption on the (111) facet of Ag, 4-[trans-2-(pyrid-4-yl-vinyl)] benzoic acid (PVBA) self-assembles into a highly ordered, chiral twin chain structure at submonolayer coverages with domains that can extend for micrometers in one dimension. Using polarization-dependent measurements of C and N K-shell excitations in near-edge X-ray absorption fine structure (NEXAFS) spectra, we determine the binding geometry of single PVBA molecules within this unique ensemble for both low and high coverage regimes. At submonolayer coverage, the molecule is twisted to facilitate the formation of hydrogen bonds. The gas-phase planarity is gradually recovered as the coverage is increased, with complete planarity coinciding with loss of order in the overlayer. Thermal treatment of the PVBA film results in deprotonation of the carboxyl tail of the molecule, but despite the suppression of the stabilizing hydrogen-bonds, the overlayer remains ordered. (literal)

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