The on-surface reactions of 10-bromo-10'-(2,6-dimethylphenyl)-9,9'-bianthracene on Au(111) surface have been investigated by a combination of bond-resolved scanning tunneling microscopy, scanning tunneling spectroscopy, and tightbinding and mean-field Hubbard calculations. The reactions afford the synthesis of two open-shell nanographenes (1a and 1b) exhibiting different scenarios of all-carbon magnetism. 1a, an allbenzenoid nanographene with previously unreported triangulenelike termini, contains a high proportion of zigzag edges, which endows it with an exceedingly low frontier gap of 110 meV and edge-localized states. The dominant reaction product (1b) is a non-benzenoid nanographene consisting of a single pentagonal ring in a benzenoid framework. The presence of this nonbenzenoid topological defect, which alters the bond connectivity in the hexagonal lattice, results in a non-Kekulé nanographene with a spin S = ½, which is detected as a Kondo resonance. Our work provides evidence of all-carbon magnetism, and motivates the use of topological defects as structural elements toward engineering agnetism in carbon-based nanomaterials for spintronics.
| Identifer | oai:union.ndltd.org:DRESDEN/oai:qucosa:de:qucosa:73172 |
| Date | 13 January 2021 |
| Creators | Mishra, Shantanu, Beyer, Doreen, Berger, Reinhard, Liu, Junzhi, Gröning, Oliver, Urgel, José I., Müllen, Klaus, Ruffieux, Pascal, Feng, Xinliang, Fasel, Roman |
| Publisher | American Chemical Society |
| Source Sets | Hochschulschriftenserver (HSSS) der SLUB Dresden |
| Language | English |
| Detected Language | English |
| Type | info:eu-repo/semantics/acceptedVersion, doc-type:article, info:eu-repo/semantics/article, doc-type:Text |
| Rights | info:eu-repo/semantics/openAccess |
| Relation | 1520-5126, 10.1021/jacs.9b09212, info:eu-repo/grantAgreement/European Commission/H2020 | SGA-RIA/696656//Graphene-based disruptive technologies/Graphene Core 1, info:eu-repo/grantAgreement/European Commission/H2020 | SGA-RIA/785219//Graphene Flagship Core Project 2/Graphene Core 2, info:eu-repo/grantAgreement/European Commission/H2020 | ERC | ERC-COG/819698//Development of Thiophene Based Conjugated Polymers in Two Dimensions/T2DCP |
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