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O: Fachverband Oberflächenphysik

O 77: Nanostructures at surfaces:1D, 2D, networks II

O 77.3: Vortrag

Donnerstag, 12. März 2026, 11:00–11:15, HSZ/0204

On-Surface Synthesis of a Janus Polyazaacene — •Faming Kang, Tim Naumann, Zilin Ruan, Ye Liu, and J. Michael Gottfried — Fachbereich Chemie, Philipps-Universität Marburg, Hans-Meerwein-Str. 4, 35032 Marburg, Germany

Acenes are a fascinating class of polycyclic aromatic hydrocarbons that have gained considerable research interest due to their potential application in organic electronics as well as their role in advancing fundamental knowledge about conjugated aromatic systems. Isosteric exchange of CH units of the acenes by nitrogen atoms formally gives azaacenes. The nitrogen substitution pattern, i.e., the number, position, and type of nitrogen atoms enables topological design of azaacenes, which facilitates precise tuning of frontier orbital energy level alignment and radical characters. Guided by topological considerations, introducing distinct edge structures on either side further creates Janus azaacenes. Here, we successfully synthesized a Janus polyazaacene on the Au(111) surface, in which one edge was decorated by nitrogen atoms while the other edge keeping unchanged. The length of such a polymer chain can reach up to 50 rings. Using scanning tunneling microscopy, we characterized its geometric structure and electronic property on Au(111), as well as its stability in air.

Keywords: azaacene; Janus structures; electronic property; on-surface synthesis; scanning probe microscopy