Authors
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Mishra, S. ; Xu, K. ; Eimre, K. ; Komber, H. ; Ma, J. ; Pignedoli, C. A. ; Fasel, R. ; Feng, X. ; Ruffieux, P.
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Title
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Synthesis and characterization of [7]triangulene
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Date
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07.01.2021
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Number
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58861
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Abstract
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Triangulene and its p-extended homologues constitute non-Kekulé polyradical frameworks with high-spin ground states, and are anticipated to be key components of organic spintronic devices. We report a combined in-solution and on-surface synthesis of the hitherto largest triangulene homologue, [7]triangulene (C78H24), consisting of twenty-eight benzenoid rings fused in a triangular fashion. We employ low-temperature scanning tunneling microscopy to confirm the chemical structure of individual molecules adsorbed on a Cu(111) surface. While neutral [7]triangulene in the gas phase is predicted to have an open-shell septet ground state; our scanning tunneling spectroscopy measurements, in combination with density functional theory calculations, reveal chemisorption of [7]triangulene on Cu(111) together with considerable charge transfer, resulting in a closed-shell state. Furthermore, substantial hybridization between the molecular orbitals of [7]triangulene is observed.
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Publisher
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Nanoscale
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Wikidata
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Citation
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Nanoscale 13 (2021) 1624-1628
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DOI
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https://doi.org/10.1039/D0NR08181G
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Tags
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