Regensburg 2025 – scientific programme

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O: Fachverband Oberflächenphysik

O 62: Focus Session Molecular Nanostructures on Surfaces: On-Surface Synthesis and Single-Molecule Manipulation III

O 62.5: Invited Talk

Wednesday, March 19, 2025, 11:30–12:00, H24

On-Surface Synthesis with Hydrogen Atoms — •Szymon Godlewski — Jagiellonian University, Krakow, Poland

In recent years the on-surface manipulation and chemical reactions created a playground for atomically precise synthesis and development of new atomic and molecular nanostructures. However, the abilities to produce desired systems are limited, among others, by relying on the catalytic role of the substrate in initiating selected reactions. Therefore striving for the generation of desired systems forces the search of new reaction pathways and catalytic transformations.

In this talk I will demonstrate our approach based on the application of hydrogen atoms in the on-surface experiments. First, I will discuss the synthesis of the acene series based on the application of *extra* hydrogen atoms. The application of atomic hydrogen in on-surface transformations will be exemplified by organometallic hybrids and graphene nanoribbons.

While the surface assisted synthesis approach has proven its effectiveness in the precise formation of new organic compounds on metallic surfaces one of the most challenging limitations arises from the dependence on the catalytic activity of the substrate. This makes the direct transfer to the non-metallic surfaces extremely challenging. In this talk I will present our pathway for the synthesis of new molecular compounds on non-metallic surfaces with prospects for circumventing the need to exploit the catalytic role of metallic substrates.

This work was supported by the National Science Center, Poland (2019/35/B/ST5/02666)

Keywords: acenes; hydrogen; non-metallic substrates; nanographenes