Bonding and Aromaticity in Electron-Rich Boron and Aluminum ClustersClick to copy article linkArticle link copied!
- Cina Foroutan-Nejad*Cina Foroutan-Nejad*Email: [email protected]Institute of Organic Chemistry, Polish Academy of Sciences, Kasprzaka44/52, 01-224 Warsaw, PolandMore by Cina Foroutan-Nejad
Abstract
In this work bonding and aromaticity of triply bonded atoms of group 13 elements (M≡M, M = B and Al) in recently characterized B2Al3–, Na3Al2–, and Na4Al2 are studied. Here, I show that although molecular orbital-based analyses characterize triple bonds, the electropositive nature of group 13 elements gives these bonds unique characteristics. The bond orders derived from the delocalization index, topology of the electron density, and local characteristics of (3, −1) critical points, as defined within the context of quantum theory of atoms in molecules, do not conform with those of ordinary triple bonds. In Na3Al2– and Na4Al2 clusters non-nuclear attractors form between the electropositive Al atoms acting like pseudo atoms. The bond between boron atoms in B2Al3– is more similar to an ordinary triple covalent bond benefiting from the exchange–correlation component of the interatomic interaction energy as defined via interacting quantum atom theory. However, extreme electrostatic repulsion between negatively charged boron atoms attenuates this bond. Finally, current density analysis suggests that B2Al3– is a magnetic aromatic system, nearly 50% more aromatic compared to benzene.
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