Replacing one of the peripheral Se with a Se2 bridge is an effective strategy to flatten the C4v CB4Se4 cluster. The global minimum of CB4Se5 contains one fan-shaped planar tetracoordinate carbon (ptC) CB4 core, possessing double 2π + 6σ aromaticity. The peripheral Se2 bridge is dexterous and crucial for the stability of CB4Se5.
L. Bai, R. Sun, Y. Wu and J. Guo, Chem. Commun., 2024, 60, 1341 DOI: 10.1039/D3CC05533G
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