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06/27/2024 14:16

Aromatic Compounds: A Ring Made up Solely of Metal Atoms

Marietta Fuhrmann-Koch Kommunikation und Marketing
Universität Heidelberg

    The term aromaticity is a basic, long-standing concept in chemistry that is well established for ring-shaped carbon compounds. Aromatic rings consisting solely of metal atoms were, however, heretofore unknown. The research team led by Prof. Dr Lutz Greb, a scientist at Heidelberg University’s Institute of Inorganic Chemistry, recently succeeded in isolating such a metal ring and describing it in full.

    Press Release
    Heidelberg, 27 June 2024

    The term aromaticity is a basic, long-standing concept in chemistry that is well established for ring-shaped carbon compounds. Aromatic rings consisting solely of metal atoms were, however, heretofore unknown. The research team led by Prof. Dr Lutz Greb, a scientist at Heidelberg University’s Institute of Inorganic Chemistry, recently succeeded in isolating such a metal ring and describing it in full.

    Aromatic compounds, or aromatics, are a substance class in organic chemistry, named after the aromatic smell by which the initially discovered compounds of this class were identified. In addition to ring-shaped carbon compounds, aromatic metal complexes are also known, whereby the metal atom is bound to an aromatic organic molecule. The metal ring described by the Heidelberg University chemists is different. It is made up solely of metal atoms of elemental bismuth. The isolation and characterisation of this metal ring was made possible by a new approach of supramolecular stabilisation. Lutz Greb’s research group arranged a negatively charged molecular shell around the positively charged metal ring that inhibits possible decomposition reactions.

    “We assume that our approach can be used as a general method in other areas of stabilisation of positively charged rings and cages. First of all, aromatic compounds consisting solely of metal atoms aid our fundamental understanding. However, several unexpected effects of our work point to a new basic concept in the field of aromaticity. It could be significant for charge transport in metals,” stresses Prof. Greb, who heads up the research group in molecular main group chemistry at the Institute of Inorganic Chemistry.


    Contact for scientific information:

    Prof. Dr Lutz Greb
    Institute of Inorganic Chemistry
    Phone +49 6221 54-8388
    greb@uni-heidelberg.de


    Original publication:

    R. Yadav, A. Maiti, M. Schorpp, J. Graf, F. Weigend & L. Greb: Supramolecular trapping of a cationic all-metal σ-aromatic {Bi4} ring. Nature Chemistry (published online 17 May 2024), https://doi.org/10.1038/s41557-024-01530-z


    More information:

    http://www.uni-heidelberg.de/fakultaeten/chemgeo/aci/greb – Lutz Greb research group


    Images

    The illustration shows a first aromatic ring (purple) made up solely of metal atoms, surrounded by a molecular shell that inhibits possible decomposition reactions.
    The illustration shows a first aromatic ring (purple) made up solely of metal atoms, surrounded by a ...

    Illustration: Lutz Greb


    Criteria of this press release:
    Journalists
    Chemistry
    transregional, national
    Research results
    English


     

    The illustration shows a first aromatic ring (purple) made up solely of metal atoms, surrounded by a molecular shell that inhibits possible decomposition reactions.


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