3D and 2D aromatic units behave like oil and water in the case of benzocarborane derivatives

Jordi Poater, Clara Viñas, Miquel Solà () and Francesc Teixidor ()
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Jordi Poater: Universitat de Barcelona
Clara Viñas: Campus Universitat Autònoma de Barcelona
Miquel Solà: Universitat de Girona, C/ Maria Aurèlia Capmany, 69
Francesc Teixidor: Campus Universitat Autònoma de Barcelona

Nature Communications, 2022, vol. 13, issue 1, 1-8

Abstract: Abstract A large number of 2D/2D and 3D/3D aromatic fusions that keep their aromaticity in the fused compounds have been synthesized. In addition, we have previously proven the electronic relationship between the 3D aromaticity of boron hydrides and the 2D aromaticity of PAHs. Here we report the possible existence of 3D/2D aromatic fusions that retain the whole aromaticity of the two units. Our conclusion is that such a 3D/2D aromatic combination is not possible due to the ineffective overlap between the π-MOs of the planar species and the n + 1 molecular orbitals in the aromatic cage that deter an effective electronic delocalization between the two fused units. We have also proven the necessary conditions for 3D/3D fusions to take place, and how aromaticity of each unit is decreased in 2D/2D and 3D/3D fusions.

Date: 2022
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DOI: 10.1038/s41467-022-31267-7

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