Dresden 2026 – scientific programme
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O: Fachverband Oberflächenphysik
O 69: Nanostructures at surfaces:1D, 2D, networks – Poster
O 69.5: Poster
Wednesday, March 11, 2026, 18:00–20:00, P2
Nonalternant Carbon Nanoribbon with 4-5-6-8 Topology via Indenofluorene Polymer Fusion — •Dong Han1, Tim Naumann1, Faming Kang1, Alexandr Oshchepkov2, Mikhail Kalinin2, Ye Liu1, Zilin Ruan1, Konstantin Y. Amsharov2, and J. Michael Gottfried1 — 1Philipps-Universität Marburg, Fachbereich Chemie, Hans-Meerwein-Str. 4, 35032 Marburg, Germany — 2Martin-Luther-Universität Halle-Wittenberg, Institut für Chemie, Organische Chemie, 06120 Halle (Saale), Germany
Carbon nanoribbons (CNRs) with nonhexagonal rings constitute a fascinating class of low-dimensional carbon materials exhibiting tunable chemical and physical properties distinct from those of conventional graphene nanoribbons (GNRs). Here, we report the on-surface synthesis and characterization of a nonalternant 4-5-6-8 CNR. This nanoribbon is obtained via lateral fusion of cis-linked indeno[2,1-a]fluorene (IF) polymer chains, formed by sequential debrominative and dehydrogenative C-C coupling reactions of a halogenated arene. Bond-resolved scanning tunneling microscopy (BR-STM) confirms the atomic structure of the resulting CNR. Scanning tunneling spectroscopy (STS) and density functional theory (DFT) calculations reveal its distinct electronic properties arising from the nonhexagonal rings. Notably, the 4-5-6-8 CNR exhibits a bandgap of 1.13 eV, highlighting the critical role of ring topology in modulating quantum confinement. X-ray photoelectron spectroscopy (XPS) further elucidates reaction pathways and intermediate species. This study establishes a controlled on-surface synthetic route towards structurally complex CNRs.
Keywords: nonalternant carbon nanoribbon; nonhexagonal ring; electronic structure; on-surface synthesis; scanning probe microscopy