Regensburg 2025 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

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

O 62.8: Vortrag

Mittwoch, 19. März 2025, 12:30–12:45, H24

On-Surface Synthesis and Reactivity of Biphenylene Network on Au(788) — •Ye Liu, Yingling Zhang, Zilin Ruan, Tim Naumann, Faming Kang, Ulrich Koert, and J. Michael Gottfried — Department of Chemistry, University of Marburg, 35032 Marburg, Germany

The recently synthesized biphenylene network (BPN), a new sp2-hybridized carbon allotrope comprising four-, six-, and eight-membered rings, significantly differs from graphene in its electronic and chemical properties. Theoretical studies predict that BPN features a multiradical ground state, with its open-shell character predominantly localized at the four-membered rings. However, experimental confirmation of these predictions has been hindered by the limited quality of the material currently available. To address this challenge, we employed Au(788), a surface characterized by narrow terraces, and designed an extended molecular precursor to promote the formation of the desired structure. For comparison, we also investigated interpolymer dehydrofluorination (HF-zipping) reactions of the precursor on Au(111). Scanning probe microscopy (SPM) analysis revealed that pure BPN fused chains formed on Au(788) exhibit superior structural quality compared to those synthesized on Au(111). These findings provide a solid experimental foundation for probing the theoretically predicted properties of BPN, opening avenues for the further exploration of its distinctive electronic and chemical behavior.

Keywords: Biphenylene; Multiradical ground state; Interpolymer dehydrofluorination; Au(788); Scanning probe microscopy