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The role of surface defects in large organic molecule adsorption: substrate configuration effects

Research output: Contribution to journalJournal articlepeer-review

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  • Thomas Waldmann
  • Christina Nenon
  • Katrin Tonigold
  • Harry E. Hoster
  • Axel Gross
  • R. Juergen Behm
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<mark>Journal publication date</mark>14/08/2012
<mark>Journal</mark>Physical Chemistry Chemical Physics
Issue number30
Volume14
Number of pages6
Pages (from-to)10726-10731
Publication StatusPublished
<mark>Original language</mark>English

Abstract

The role of the configuration of metal surface atoms in the interaction between individual large, planar organic molecules and a metal substrate was investigated by low-temperature scanning tunneling microscopy and density functional theory calculations, including a semi-empirical correction scheme to account for dispersion effects. As test case, we used the adsorption of the oligopyridine derivative 2-phenyl-4,6-bis(6-(pyridine-2-yl)-4-(pyridine-4-yl) pyridine-2-yl) pyrimidine (2,4'-BTP) on a stepped Ag(100) surface. Both experiment, via statistical evaluation of the adsorption site and orientation of 2,4'-BTP admolecules, and theory indicate distinct structural effects. The results are compared with the adsorption behavior of pyridine derivatives and benzene on metal surfaces. Consequences on the understanding of the interaction between heteroatoms or functional groups in large organic adsorbates and metal atoms in typical nano-scaled surface defects and hence of the interaction with more realistic metal surfaces are discussed.