SKM 2023 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 55: Organic Molecules on Inorganic Substrates IV: Adsorption and Growth II

O 55.8: Vortrag

Mittwoch, 29. März 2023, 17:00–17:15, CHE 91

Oxygen-induced reorientation of organometallic chains on Cu(110) — •Ilias Gazizullin, Christophe Nacci, and Leonhard Grill — Physical Chemistry Department, University of Graz, Heinrichstraße 28, Graz, Austria

The deposition of molecules onto crystalline surfaces allows their investigation at the single-molecule level by scanning tunneling microscopy (STM). It furthermore gives access to the controllable on-surface synthesis of covalent polymers [1]. Here, we have studied dibromo-p-terphenyl molecules on Cu(110) and on the Cu(110)-(2x1)O striped phase under ultra-high vacuum conditions with low-temperature STM.

Previously, the Cu(110)-(2x1)O striped phase was used as a template for the synthesis of organometallic structures having different sizes and shapes depending on the width of copper stripes [2]. The focus of our study is how pre- or post-adsorbed oxygen and annealing, which is necessary for covalent polymerization, affect the molecular adsorption on the surface. It turns out that on the striped phase the molecules form organometallic chains on the copper areas, oriented in at least three surface directions. Increasing the sample temperature from 300 K to 450 K induces a reorientation of the organometallic chains, which occurs due to stabilization of the reoriented OM chains by embedding in the Cu-O phase.

References

[1] L. Grill, S. Hecht, Nature Chemistry 12, 115-130 (2020)

[2] Q. Fan, J. Dai, T. Wang, J. Kuttner, G. Hilt, J. M. Gottfried, and J. Zhu, ACS Nano 3, 3747 (2016)