Odd-even effects in the structure and stability of azobenzene-substituted alkanethiolates on Au(111) and Ag(111) substrates

• Verfasst von: Gnatek, Dominika [VerfasserIn]
• Verfasst von: Schuster, Swen [VerfasserIn]
• Verfasst von: Ossowski, Jakub [VerfasserIn]
• Verfasst von: Khan, Musammir [VerfasserIn]
• Verfasst von: Rysz, Jakub [VerfasserIn]
• Verfasst von: Krakert, Simone [VerfasserIn]
• Verfasst von: Terfort, Andreas [VerfasserIn]
• Verfasst von: Zharnikov, Michael [VerfasserIn]
• Verfasst von: Cyganik, Piotr [VerfasserIn]
• Titel: Odd-even effects in the structure and stability of azobenzene-substituted alkanethiolates on Au(111) and Ag(111) substrates
• Verf.angabe: Dominika Gnatek, Swen Schuster, Jakub Ossowski, Musammir Khan, Jakub Rysz, Simone Krakert, Andreas Terfort, Michael Zharnikov, and Piotr Cyganik
• E-Jahr: 2015
• Jahr: October 20, 2015
• Umfang: 16 S.
• Fussnoten: Gesehen am 15.06.2020
• Titel Quelle: Enthalten in: The journal of physical chemistry <Washington, DC> / C
• Ort Quelle: Washington, DC : Soc., 2007
• Jahr Quelle: 2015
• Band/Heft Quelle: 119(2015), 46, Seite 25929-25944
• ISSN Quelle: 1932-7455
• DOI: doi:10.1021/acs.jpcc.5b07899
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 170056174X

Abstract

Structural properties and stability of the self-assembled monolayers (SAMs) of two prototypical azobenzene-based alkanethiols (C6H5-N═N-C6H4-(CH2)n-SH) on Au(111) and Ag(111) substrates were studied in detail using a combination of complementary experimental techniques. The azobenzene moiety in these films was linked to the thiol headgroup via short aliphatic spacers of variable length, i.e., (CH2)3 or (CH2)4, corresponding to a different parity of n. For both Au(111) and Ag(111) substrates, a pronounced dependence of the packing density and molecular inclination on the parity of n was observed, with a higher packing density (by ∼14%) and smaller inclination (by ∼17°) of the azobenzene moieties for n = odd as compared to n = even on Au(111) and reversed, but somewhat reduced, behavior on Ag(111). This dependence was related to the well-known odd-even effects in molecular assembly on noble metal substrates, reported previously for a variety of oligophenyl-substituted alkanethiolate SAMs and observed now for the azobenzene-substituted monolayers as well, underlining their generality. The structural odd-even behavior was accompanied by odd-even effects in the stability of the substrate-S bond, with the latter effects being directly correlated to the respective structure variation. The above results are of general importance for the design of functional monomolecular films and of a particular significance as a basis for dedicated photoisomerization experiments.