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Edge-condensation to access a crystalline planar icosagen cation with σ-aromaticity

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  • Zhongtao Feng

    (Nanyang Technological University)

  • Rei Kinjo

    (Nanyang Technological University)

Abstract

Parallel to the hexagonal C6 motif in carbon materials (such as graphene and carbon nanotubes) and polyaromatic hydrocarbons, three-membered boron and aluminum rings are the smallest key units seen in their clusters and materials (such as borophene). Herein, we report an edge-condensation protocol of a B3 ring to render a cationic icosagen species. A single-crystal X-ray diffraction analysis and computational studies reveal that the planar B3Al2 core consists of three consecutive three-center two-electron bonds. Remarkably, the icosagen ring exhibits global σ-aromaticity. The reactions with a cationic gallium and a copper complex afford a dicationic B3Al2 species assimilating a Ga atom by coordination with two borafluorene ligands and a dinuclear copper complex bearing a η2-dianionic diborane ligand, respectively, demonstrating the π-donor property as well as the capability of transferring the dianionic diborane fragment.

Suggested Citation

  • Zhongtao Feng & Rei Kinjo, 2025. "Edge-condensation to access a crystalline planar icosagen cation with σ-aromaticity," Nature Communications, Nature, vol. 16(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:16:y:2025:i:1:d:10.1038_s41467-025-64970-2
    DOI: 10.1038/s41467-025-64970-2
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