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

Zhongtao Feng and Rei Kinjo ()
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Zhongtao Feng: Nanyang Technological University
Rei Kinjo: Nanyang Technological University

Nature Communications, 2025, vol. 16, issue 1, 1-7

Abstract: 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.

Date: 2025
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DOI: 10.1038/s41467-025-64970-2

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