Polycyclic aromatic hydrocarbons exhibit a rich spectrum of physicochemical properties depending on the size and, more critically, on the edge and bond topologies. Among them, open-shell systems - molecules hosting unpaired electron densities - represent an important class of materials for organic electronic, spintronic, and optoelectronic devices, but remain challenging to synthesize in solution. We report the on-surface synthesis and scanning tunneling microscopy- and spectroscopybased study of two ultralow-gap open-shell molecules, namely peri-tetracene, a benzenoid graphene fragment with zigzag edge topology, and dibenzo[a,m]dicyclohepta-[bcde,nopq]rubicene, a nonbenzenoid nonalternant structural isomer of peri-tetracene with two embedded azulene units. Our results provide an understanding of the ramifications of altered bond topologies at the single-molecule scale, with the prospect of designing functionalities in carbon-based nanostructures via engineering of bond topology.
| Identifer | oai:union.ndltd.org:DRESDEN/oai:qucosa:de:qucosa:36585 |
| Date | 07 January 2020 |
| Creators | Mishra, Shantanu, Lohr, Thorsten G., Pignedoli, Carlo A., Liu, Junzhi, Berger, Reinhard, Urgel, JoséI., Müllen, Klaus, Feng, Xinliang, Ruffieux, Pascal, Fasel, Roman |
| 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 | 1936-086X, 10.1021/acsnano.8b07225, info:eu-repo/grantAgreement/Europäischer Sozialfonds/Horizon2020/100270084//Graphenzentrum Dresden/GraphD |
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