Berlin 2024 – scientific programme

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O: Fachverband Oberflächenphysik

O 31: Poster: Organic Molecules on Inorganic Substrates

O 31.11: Poster

Tuesday, March 19, 2024, 18:00–20:00, Poster C

functionalized platform molecules on Au and Ag (111) studied with scanning tunneling microscopy — •Behzad Mortezapour¹, Alexander Weismann¹, Sebastian Hamer², Rainer Herges², and Richard Berndt¹ — ¹Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, Germany — ²Otto-Diels-Institut fur Organische Chemie, Christian-Albrechts-Universität zu Kiel, Germany

To prepare well-ordered molecular architectures on solid surfaces we use the triangular molecular platform trioxatriangulenium. Its central carbon atom enables vertical attachment of various ligands. We present low-temperature scanning tunneling microscopy results for platforms with the ligands phenyl, 3-pyridyl and sec-butyl. The molecules were sublimated onto Au (111) and Ag (111) surfaces at ambient temperature with 99 % of the molecules remaining intact. On the reconstructed Au substrate, the molecules arrange into hexagonal and honeycomb arrays, preferentially in fcc areas. On Ag, the molecules solely adopt closed-packed hexagonal patterns. Single molecules were manipulated with the scanning tunneling microscope tip. We show first spectroscopic results and present current-distance measurements that cover the transition from tunneling to a single molecule contact.

Keywords: molecular self- assembly; scanning tunneling microscopy; molecular platform; molecule-metal junction