Unambiguous determination of the adsorption geometry of a metal-organic complex on a bulk insulator

Link:
Autor/in:
Erscheinungsjahr:
2010
Medientyp:
Text
Schlagworte:
  • Atomic force microscopy
  • Tips
  • Noncontact atomic
  • Atomic Force Microscopy
  • Self Assembled Monolayers
  • Molecules
  • Atomic force microscopy
  • Tips
  • Noncontact atomic
  • Atomic Force Microscopy
  • Self Assembled Monolayers
  • Molecules
Beschreibung:
  • Individual molecules of Co-Salen, a small chiral paramagnetic metal organic Schiff base complex, were deposited on NaCl(001) and subsequently imaged with noncontact atomic force microscopy employing Cr coated tips in a cryogenic ultrahigh vacuum environment. Images were obtained in which both the position and orientation of the adsorbed molecules and the atomic structure of the surface are resolved simultaneously, enabling the determination of the exact adsorption site. Density functional theory calculations were used to identify the ionic sublattice resolved with the Cr tip and also to confirm the adsorption site and orientation of the molecule on the surface. These calculations show that the central Co atom of the molecule physisorbs on top of a Cl on and is aligned along < 110 >-directions in its lowest energy configuration. In addition, a local energy minimum exists along (100)-directions. Due to the chirality of the molecule, two mirror symmetric configurations rotated by approximately +/- 5 degrees away from these directions are energetically equivalent. The resulting 16 low energy configurations are observed in the experimental images.
Lizenz:
  • info:eu-repo/semantics/restrictedAccess
Quellsystem:
Forschungsinformationssystem der UHH

Interne Metadaten
Quelldatensatz
oai:www.edit.fis.uni-hamburg.de:publications/bc1c05aa-095d-4ef2-b516-8d9aa1609082