Dresden 2020 – scientific programme
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O: Fachverband Oberflächenphysik
O 63: Focus Session: Functional Molecules at Surfaces III
O 63.12: Talk
Wednesday, March 18, 2020, 13:30–13:45, TRE Ma
Characterizing Tip-Induced Motion and 3D Adsorption Conformations of Terphenyl Derivates on Metal Surfaces — •Qigang Zhong1,2, Daniel Ebeling1, Jalmar Tschakert1, Shixuan Du3, Doreen Mollenhauer4, Hermann A. Wegner5, Lifeng Chi2, and Andre Schirmeisen1 — 1Institute of Applied Physics, Justus-Liebig University Giessen, Germany — 2Institute of Functional Nano & Soft Materials, Soochow University, China — 3Institute of Physics, Chinese Academy of Sciences, China — 4Institute of Physical Chemistry, Justus Liebig University, Germany — 5Institute of Organic Chemistry, Justus Liebig University, Germany
Studying adsorption conformations and motion of single molecules confined on a 2D surface is essential for understanding surface catalysis, molecular reactions, or self-assembly at the atomic level. Due to site-specific molecule-substrate interactions the adsorption conformations are often non-planar, which can lead to characteristic dynamics of the adsorbed molecules. Here, we investigate the non-stationary features of two terphenyl-based molecules (4,4''-diamino-p-terphenyl, DATP and 4-bromo-3''-iodo-p-terphenyl, BrI-TP) on Cu(111) with single-bond resolution using noncontact atomic force microscopy[1,2]. Frustrated translational or rotational movements of the molecules between two metastable adsorption positions on Cu(111) are observed under the influence of the probe tip. Such non-stationary adsorption states can affect, e.g. the hierarchical dehalogenation of BrI-TP or the local binding affinity and the self-assembly process of DATP.
[1] Nat. Commun. 9, 3277 (2018). [2] ACS Nano 13, 324 (2019).