Regensburg 2025 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 17: Poster Focus Session Molecular Nanostructures on Surfaces: On-Surface Synthesis and Single-Molecule Manipulation

O 17.6: Poster

Montag, 17. März 2025, 18:00–20:00, P2

Controlling on-surface chemical reactions through photochemistry — •Hao Jiang, Yu He, Jiayi Lu, Zhiwen Zhu, and Qiang Sun — Materials Genome Institute, Shanghai University, 200444 Shanghai , China

On-surface synthesis targets extended nanostructures by covalent coupling of organic molecules on surfaces. The most common way to induce reactions of precursor molecules on the surface is by heating, which will however increase the possibility of forming side reactions and lacks selectivity in many cases, thus limiting wider applications of on-surface synthesis. In contrast to the thermally triggered chemistry, photochemistry provides an alternative way to activate molecules. Light has been demonstrated to break certain covalent bonds in a less constructive fashion. Moreover, light has more adjustable parameters such as intensity, wavelength, polarization, etc., to control reactions more finely. Recently, we demonstrated the use of light polarizations to reveal the mechanism of dehalogenation reaction and realized photo induced dechlorination reactionon metal surfaces.

In this poster, we will showcase the wavelength dependence in on-surface synthesis and demonstrate how to harness photochemistry to achieve reaction selectivity in on-surface reactions. Three organic molecules, each with the same functional group, exhibit different chemical reactivities under photon excitation. Our work provides fundamental insights into photoinduced on-surface reactions and illustrates the potential of photochemistry for achieving highly selective and controllable reactions.

Keywords: on-surface synthesis; photochemistry; scanning tunneling microscopy