Ring currents in a proposed system containing planar hexacoordinate carbon, CB(2-)(6).

Area of Science:

• Quantum chemistry
• Theoretical chemistry
• Aromaticity studies

Background:

• The understanding of aromaticity and magnetic response in novel carbon structures is crucial for developing new materials.
• Hexacoordinate carbon species represent an unconventional area of chemical research with unexplored electronic properties.

Purpose of the Study:

• To investigate the magnetic response and electronic properties of the hypothetical planar hexacoordinate carbon species, CB(2-)(6).
• To elucidate the nature of current densities within this unique carbon framework using advanced computational methods.

Main Methods:

• Calculations were performed at the coupled Hartree-Fock level of theory.
• The continuous transformation of origin of current density (CTOCD) approach was employed to generate current-density maps.

Main Results:

• The study demonstrates that the carbon-containing CB(2-)(6) species exhibits a diamagnetic pi-ring current, characteristic of aromatic systems.
• In contrast, the empty CB(2-)(6) framework supports paramagnetic currents.
• The calculated magnetic properties of both 6pi and 4pi CB(2-)(6) systems align with established models for benzene and cyclooctatetraene.

Conclusions:

• The hypothetical planar hexacoordinate carbon species, CB(2-)(6), displays a stable diamagnetic ring current, suggesting aromatic character.
• The electronic and magnetic properties of CB(2-)(6) can be explained using existing orbital models, despite its unconventional structure.
• This research provides a theoretical foundation for understanding the magnetic behavior of highly coordinated carbon systems.