Turco, Elia; Mishra, Shantanu; Melidonie, Jason; Eimre, Kristjan; Obermann, Sebastian; Pignedoli, Carlo A.; Fasel, Roman; Feng, Xinliang; Ruffieux, Pascal (2021). On-Surface Synthesis and Characterization of Super-nonazethrene. The journal of physical chemistry letters, 12(34), pp. 8314-8319. American Chemical Society 10.1021/acs.jpclett.1c02381
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Beginning with the early work of Clar et al. in 1955, zethrenes and their laterally extended homologues, super-zethrenes, have been intensively studied in the solution phase and widely investigated as optical and charge transport materials. Superzethrenes are also considered to exhibit an open-shell ground state and may thus serve as model compounds to investigate nanoscale π-magnetism. However, their synthesis is extremely challenging due to their high reactivity. We report here the on-surface synthesis of the hitherto largest zethrene homologue - super-nonazethrene - on Au(111). Using single-molecule scanning tunneling microscopy and spectroscopy, we show that super-nonazethrene exhibits an open-shell singlet ground state featuring a large spin polarization-driven electronic gap of 1 eV. Consistent with the emergence of an open-shell ground state, high-resolution tunneling spectroscopy reveals singlet–triplet spin excitations in super-nonazethrene, characterized by a strong intramolecular magnetic exchange coupling of 51 meV. Given the paucity of zethrene chemistry on surfaces, our results therefore provide unprecedented access to large, open-shell zethrene compounds amenable to scanning probe measurements, with potential application in molecular spintronics.
Item Type: |
Journal Article (Original Article) |
|---|---|
Division/Institute: |
08 Faculty of Science > Department of Chemistry, Biochemistry and Pharmaceutical Sciences (DCBP) |
UniBE Contributor: |
Fasel, Roman |
Subjects: |
500 Science > 530 Physics 500 Science > 540 Chemistry |
ISSN: |
1948-7185 |
Publisher: |
American Chemical Society |
Language: |
English |
Submitter: |
Roman Fasel |
Date Deposited: |
17 Feb 2022 15:18 |
Last Modified: |
05 Dec 2022 16:05 |
Publisher DOI: |
10.1021/acs.jpclett.1c02381 |
PubMed ID: |
34428064 |
BORIS DOI: |
10.48350/164876 |
URI: |
https://boris.unibe.ch/id/eprint/164876 |
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