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Tailoring Bond Topologies in Open-Shell Graphene Nanostructures

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.

Identiferoai:union.ndltd.org:DRESDEN/oai:qucosa:de:qucosa:36585
Date07 January 2020
CreatorsMishra, Shantanu, Lohr, Thorsten G., Pignedoli, Carlo A., Liu, Junzhi, Berger, Reinhard, Urgel, JoséI., Müllen, Klaus, Feng, Xinliang, Ruffieux, Pascal, Fasel, Roman
PublisherACS Publications
Source SetsHochschulschriftenserver (HSSS) der SLUB Dresden
LanguageEnglish
Detected LanguageEnglish
Typeinfo:eu-repo/semantics/publishedVersion, doc-type:article, info:eu-repo/semantics/article, doc-type:Text
Rightsinfo:eu-repo/semantics/openAccess
Relation1936-086X, 10.1021/acsnano.8b07225, info:eu-repo/grantAgreement/Europäischer Sozialfonds/Horizon2020/100270084//Graphenzentrum Dresden/GraphD

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