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Observation of the Magnetic Ground State of the Two Smallest Triangular Nanographenes


Turco, Elia; Bernhardt, Annika; Krane, Nils; Valenta, Leoš; Fasel, Roman; Juricek, Michal; Ruffieux, Pascal (2023). Observation of the Magnetic Ground State of the Two Smallest Triangular Nanographenes. JACS Au, 3(5):1358-1364.

Abstract

Fusion of three benzene rings in a triangular fashion gives rise to the smallest open-shell graphene fragment, the phenalenyl radical, whose π-extension leads to an entire family of non-Kekulé triangular nanographenes with high-spin ground states. Here, we report the first synthesis of unsubstituted phenalenyl on a Au(111) surface, which is achieved by combining in-solution synthesis of the hydro-precursor and on-surface activation by atomic manipulation, using the tip of a scanning tunneling microscope. Single-molecule structural and electronic characterizations confirm its open-shell S = 1/2 ground state that gives rise to Kondo screening on the Au(111) surface. In addition, we compare the phenalenyl’s electronic properties with those of triangulene, the second homologue in the series, whose S = 1 ground state induces an underscreened Kondo effect. Our results set a new lower size limit in the on-surface synthesis of magnetic nanographenes that can serve as building blocks for the realization of new exotic quantum phases of matter.

Abstract

Fusion of three benzene rings in a triangular fashion gives rise to the smallest open-shell graphene fragment, the phenalenyl radical, whose π-extension leads to an entire family of non-Kekulé triangular nanographenes with high-spin ground states. Here, we report the first synthesis of unsubstituted phenalenyl on a Au(111) surface, which is achieved by combining in-solution synthesis of the hydro-precursor and on-surface activation by atomic manipulation, using the tip of a scanning tunneling microscope. Single-molecule structural and electronic characterizations confirm its open-shell S = 1/2 ground state that gives rise to Kondo screening on the Au(111) surface. In addition, we compare the phenalenyl’s electronic properties with those of triangulene, the second homologue in the series, whose S = 1 ground state induces an underscreened Kondo effect. Our results set a new lower size limit in the on-surface synthesis of magnetic nanographenes that can serve as building blocks for the realization of new exotic quantum phases of matter.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Department of Chemistry
Dewey Decimal Classification:540 Chemistry
Scopus Subject Areas:Physical Sciences > Analytical Chemistry
Physical Sciences > Chemistry (miscellaneous)
Physical Sciences > Physical and Theoretical Chemistry
Physical Sciences > Organic Chemistry
Language:English
Date:22 May 2023
Deposited On:20 Feb 2024 08:31
Last Modified:30 Jun 2024 03:32
Publisher:American Chemical Society (ACS)
ISSN:2691-3704
OA Status:Gold
Free access at:Publisher DOI. An embargo period may apply.
Publisher DOI:https://doi.org/10.1021/jacsau.2c00666
PubMed ID:37234116
Project Information:
  • : FunderH2020
  • : Grant ID813036
  • : Project TitleULTIMATE - Bottom-Up generation of atomicalLy precise syntheTIc 2D MATerials for high performance in energy and Electronic applications â�� A multi-site innovative training action
  • : FunderH2020
  • : Grant ID881603
  • : Project TitleGrapheneCore3 - Graphene Flagship Core Project 3
  • : FunderH2020
  • : Grant ID716139
  • : Project TitleINSPIRAL - Spin-Delocalization with a Twist: Chiral Open-Shell Helices
  • : FunderH2020
  • : Grant ID819698
  • : Project TitleT2DCP - Development of Thiophene Based Conjugated Polymers in Two Dimensions
  • : FunderSNSF
  • : Grant ID182015
  • : Project TitleOn-surface synthesis of low-dimensional nanomaterials (OSSY)
  • : FunderSNSF
  • : Grant ID205987
  • : Project TitleBottom-up design and exploration of p-electron quantum magnetism
  • : FunderSNSF
  • : Grant ID170534
  • : Project TitleControl of Spin Interactions in Helical Systems
  • : FunderSNSF
  • : Grant ID198900
  • : Project TitleA “Closer Look” at Open-Shell Nanographenes Through Bond and Space
  • : FunderSNSF
  • : Grant ID182892
  • : Project TitleNCCR MARVEL: Materials’ Revolution: Computational Design and Discovery of Novel Materials (phase II)
  • : FunderOffice of Naval Research
  • : Grant IDN00014-18-1-2708
  • : Project Title
  • Content: Published Version
  • Language: English
  • Licence: Creative Commons: Attribution 4.0 International (CC BY 4.0)