Three-dimensional aromaticity in polyhedral boranes and related molecules.

Area of Science:

• Inorganic Chemistry
• Theoretical Chemistry
• Materials Science

Background:

• Aromaticity is a key concept in chemical bonding, traditionally applied to 2D systems like benzene.
• Boron hydrides exhibit complex structures with unique electronic properties.

Purpose of the Study:

• To explore the analogy of aromaticity between 2D hydrocarbons and 3D borane anions.
• To validate chemical bonding models using computational and experimental data.
• To extend these models to other boron-containing structures.

Main Methods:

• Application of graph theory and tensor surface harmonic theory to chemical bonding.
• Utilizing computational studies to analyze electronic structures.
• Employing experimental electron density distribution determinations.

Main Results:

• Demonstrated analogy between aromaticity in benzene and deltahedral borane anions (BnHn2-, 6 ≤ n ≤ 12).
• Validation of the chemical bonding models through computational and experimental evidence.
• Successful application of related methods to diverse boron structures.

Conclusions:

• Chemical bonding models based on graph and tensor theories effectively describe aromaticity in both 2D and 3D systems.
• The findings extend the understanding of bonding in boranes, boron hydrides, metallaboranes, elemental boron, and metal borides.