Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 61, Issue 23, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202114983
Keywords
Carbon Magnetism; Open-Shell Character; Periacenes; Scanning Tunneling Microscopy; Surface Chemistry
Categories
Funding
- Comunidad de Madrid [Y2018/NMT-4783, P2018/NMT-4321]
- ERC [819698, 766555]
- Ministerio de Ciencia, Innovacion y Universidades [PGC2018-098613-B-C21, CTQ2017-83531-R, PID2019-108532GB-I00, CTQ2016-81911-REDT]
- Severo Ochoa Programme for Centers of Excellence in RD (MINECO) [SEV-2016-0686]
- EU Graphene Flagship (Graphene Core 3) [881603]
- German Research Foundation (DFG) within the Cluster of Excellence Center for Advancing Electronics Dresden (cfaed)
- DFG-SNSF Research Project (EnhanTopo) [429265950]
- Praemium Academie of the Academy of Science of the Czech Republic
- MEYS CR [LM2018110]
- European Union [886314]
- GACR [20-13692X]
- European Research Council (ERC) [766555] Funding Source: European Research Council (ERC)
- Marie Curie Actions (MSCA) [886314] Funding Source: Marie Curie Actions (MSCA)
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This study reports the successful on-surface synthesis of the largest pristine member of the n-PA family, peri-heptacene, on an Au(111) substrate under ultra-high vacuum conditions. High-resolution scanning tunneling microscopy and theoretical simulations provide insights into the chemical structure of this previously elusive compound. Scanning tunneling spectroscopy reveals that peri-heptacene exhibits an antiferromagnetic open-shell singlet ground state and a singlet-triplet spin-flip inelastic excitation with an effective exchange coupling of 49 meV.
The synthesis of long n-peri-acenes (n-PAs) is challenging as a result of their inherent open-shell radical character, which arises from the presence of parallel zigzag edges beyond a certain n value. They are considered as pi-electron model systems to study magnetism in graphene nanostructures; being potential candidates in the fabrication of optoelectronic and spintronic devices. Here, we report the on-surface formation of the largest pristine member of the n-PA family, i.e. peri-heptacene (n=7, 7-PA), obtained on an Au(111) substrate under ultra-high vacuum conditions. Our high-resolution scanning tunneling microscopy investigations, complemented by theoretical simulations, provide insight into the chemical structure of this previously elusive compound. In addition, scanning tunneling spectroscopy reveals the antiferromagnetic open-shell singlet ground state of 7-PA, exhibiting singlet-triplet spin-flip inelastic excitations with an effective exchange coupling (J(eff )) of 49 meV.
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