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O: Fachverband Oberflächenphysik

O 31: Metal & Semiconductor substrates: Adsorption and reaction of small molecules – Poster

O 31.6: Poster

Montag, 9. März 2026, 18:00–20:00, P2

Orientation-dependent Adsorption and Manipulation of a Boron-doped Polycyclic Aromatic Hydrocarbon — •Elishka Vaz¹, Matthias Schnitzlein², Frank Würthner², Matthias Bode¹, and Jing Qi¹ — ¹Physikalisches Institut, Experimentelle Physik 2, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany — ²Institut für Organische Chemie, Organische Chemie II, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany

The incorporation of boron atoms into polycyclic aromatic hydrocarbons (PAHs) alters their electronic properties since the boron centres act as π-acceptors [1]. In this contribution, we present a novel boron-centered PAH with terminal bromine-substituents. Upon adsorption on the Cu(111) surface, the B-PAHs adopt twelve distinct azimuthal orientations: six aligned with the crystallographic directions of the (111) surface, and six rotated by 30^∘. Differential-conductance spectroscopy and apparent-height analyses reveal a pronounced influence of the substrate on both the topographic appearance and electronic structure. Atomic-resolution imaging enables assignment of adsorption sites via interpolation of the surface atomic rows. Moreover, lateral tip-induced manipulation demonstrates controlled stacking along the molecular short axis. Finally, we identify a double-chain arrangement, likely composed of intact molecules, which exhibits a notable spectral shift in the differential-conductance signature relative to isolated adsorbates.
[1] M. Schnitzlein et al., ChemistryEurope 3, e202500135 (2025)

Keywords: STM; STS; PAHs; tip manipulation; adsorption site