In this work, we demonstrate the bottom-up on-surface synthesis of poly(para-dibenzo[bc,kl]-coronenylene) (PPDBC), a zigzag edge-encased analog of poly(para-phenylene) (PPP), and its lateral fusion into zigzag edge-extended graphene nanoribbons (zeeGNRs). Toward this end, we designed a dihalogenated di(meta-xylyl)anthracene monomer displaying strategic methyl groups at the substituted phenyl ring and investigated its applicability as precursor in the thermally induced surface-assisted polymerization and cyclodehydrogenation. The structure of the resulting zigzag edge-rich (70%) polymer PPDBC was unambiguously confirmed by scanning tunneling microscopy (STM) and non-contact atomic force microscopy (nc-AFM). Remarkably, by further thermal treatment at 450 °C two and three aligned PPDBC chains can be laterally fused into expanded zeeGNRs, with a ribbon width of nine (N = 9) up to 17 (N = 17) carbon atoms. Moreover, the resulting zeeGNRs exhibit a high ratio of zigzag (67%) vs armchair (25%) edge segments and feature electronic band gaps as low as 0.9 eV according to gaps quasiparticle calculations.
| Identifer | oai:union.ndltd.org:DRESDEN/oai:qucosa:de:qucosa:37010 |
| Date | 03 June 2020 |
| Creators | Beyer, Doreen, Wang, Shiyong, Pignedoli, Carlo A., Melidonie, Jason, Yuan, Bingkai, Li, Can, Wilhelm, Jan, Ruffieux, Pascal, Berger, Reinhard, Müllen, Klaus, Fasel, Roman, Feng, Xinliang |
| Publisher | ACS Publications |
| Source Sets | Hochschulschriftenserver (HSSS) der SLUB Dresden |
| Language | English |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, doc-type:article, info:eu-repo/semantics/article, doc-type:Text |
| Rights | info:eu-repo/semantics/openAccess |
| Relation | 1520-5126, 10.1021/jacs.8b10407, info:eu-repo/grantAgreement/Europäischer Sozialfonds/Horizon2020/100270084//Graphenzentrum Dresden/GraphD |
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