Exchange Interactions and Intermolecular Hybridization in a Spin-1/2 Nanographene Dimer.

Krane, N; Turco, E; Bernhardt, A; Jacob, D; Gandus, G; Passerone, D; Luisier, M; Juríček, M; Fasel, R; Fernández-Rossier, J; Ruffieux, P (2023). Exchange Interactions and Intermolecular Hybridization in a Spin-1/2 Nanographene Dimer. Nano letters, 23(20), pp. 9353-9359. American Chemical Society 10.1021/acs.nanolett.3c02633

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Phenalenyl is a radical nanographene with a triangular shape hosting an unpaired electron with spin S = 1/2. The open-shell nature of the phenalenyl is expected to be retained in covalently bonded networks. As a first step, we report synthesis of the phenalenyl dimer by combining in-solution synthesis and on-surface activation and its characterization on Au(111) and on a NaCl decoupling layer by means of inelastic electron tunneling spectroscopy (IETS). IETS shows inelastic steps that are identified as singlet-triplet excitation arising from interphenalenyl exchange. Spin excitation energies with and without the NaCl decoupling layer are 48 and 41 meV, respectively, indicating significant renormalization due to exchange with Au(111) electrons. Furthermore, third-neighbor hopping-induced interphenalenyl hybridization is fundamental to explaining the position-dependent bias asymmetry of the inelastic steps and activation of kinetic interphenalenyl exchange. Our results pave the way for bottom-up synthesis of S = 1/2 spin-lattices with large exchange interactions.

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 > 570 Life sciences; biology
500 Science > 540 Chemistry

ISSN:

1530-6984

Publisher:

American Chemical Society

Language:

English

Submitter:

Pubmed Import

Date Deposited:

12 Oct 2023 11:07

Last Modified:

26 Oct 2023 00:16

Publisher DOI:

10.1021/acs.nanolett.3c02633

PubMed ID:

37819646

Uncontrolled Keywords:

carbon magnetism decoupling layer inelastic electron tunneling spectroscopy open-shell nanographene phenalenyl radicaloids

BORIS DOI:

10.48350/187118

URI:

https://boris.unibe.ch/id/eprint/187118

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