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Influence of subsurface layers on the adsorption of large organic molecules on close-packed metal surfaces

AuthorsVitali, Lucia
KeywordsMetal−organic interfaces
Subsurface layers
Local relaxation
Scanning tunneling microscopy
Density functional theory
Issue Date2011
PublisherAmerican Chemical Society
CitationACS Nano 5(2): 1360-1365 (2011)
AbstractThe asymmetric molecule 4-[trans-2-(pyrid-4-yl-vinyl)] benzoic acid (PVBA) adsorbed on Cu(111) is characterized by scanning tunneling microscopy (STM) and density functional theory (DFT) to determine the influence of subsurface atomic layers on the adsorption. In contrast to the 6-fold symmetry of the first atomic layer of close-packed surfaces, we find that the arrangement of the isolated molecules follows predominantly a 3-fold symmetry. This reduction in symmetry, where the molecule selects a specific orientation along the −211 axes, reveals the contribution of lower-lying Cu layers to the molecular arrangement. Our calculations rationalize the interaction of the substrate with the molecule in terms of electrostatic screening and local relaxation phenomena.
Description6 páginas, 3 figuras, 1 tabla.-- et al.
Publisher version (URL)http://dx.doi.org/10.1021/nn103058e
Appears in Collections:(CFM) Artículos
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