Xu, XiushangXiushangXuKinikar, AmoghAmoghKinikarDi Giovannantonio, MarcoMarcoDi GiovannantonioPignedoli, Carlo ACarlo APignedoliRuffieux, PascalPascalRuffieuxMüllen, KlausKlausMüllenFasel, RomanRomanFaselNarita, AkimitsuAkimitsuNarita2024-10-262024-10-262024-02-26https://boris-portal.unibe.ch/handle/20.500.12422/175073On-surface synthesis has emerged as a powerful strategy to fabricate unprecedented forms of atomically precise graphene nanoribbons (GNRs). However, the on-surface synthesis of zigzag GNRs (ZGNR) has met with only limited success. Herein, we report the synthesis and on-surface reactions of 2,7-dibromo-9,9'-bianthryl as the precursor toward π-extended ZGNRs. Characterization by scanning tunneling microscopy and high-resolution noncontact atomic force microscopy clearly demonstrated the formation of anthracene-fused ZGNRs. Unique skeletal rearrangements were also observed, which could be explained by intramolecular Diels-Alder cycloaddition. Theoretical calculations of the electronic properties of the anthracene-fused ZGNRs revealed spin-polarized edge-states and a narrow bandgap of 0.20 eV.en500 - Science::570 - Life sciences; biology500 - Science::540 - Chemistryarticle10.48350/1936813842574710.1021/prechem.3c00116