Topological ring-currents and bond-currents in the altan-[r,s]-coronenes

Area of Science:

• Organic Chemistry
• Theoretical Chemistry
• Materials Science

Background:

• Coronenes are polycyclic aromatic hydrocarbons with unique electronic properties.
• Understanding π-electron delocalization is crucial for designing novel organic materials.
• Altans represent a specific structural modification of coronenes.

Purpose of the Study:

• To investigate the π-electron ring-currents in the altans of four regular [r,s]-coronenes.
• To analyze how the topological structure influences electronic current distribution.
• To identify any unusual electronic behaviors in these modified coronene systems.

Main Methods:

• Utilized the topological Highest Localized Molecular Orbital (HLPM) approach.
• Calculated π-electron ring-currents for various [r,s]-coronene altans.
• Analyzed the bond-current patterns and their distribution within the molecular core and periphery.

Main Results:

• The bond-current pattern of the parent coronene structure is generally maintained in the core of the altan derivatives.
• Altan-[10,5]-coronene exhibits an anomalous diamagnetic current.
• The [4n]-periphery of Altan-[10,5]-coronene shows this unusual current behavior.

Conclusions:

• The HLPM approach effectively characterizes π-electron currents in coronene altans.
• Structural modifications in coronenes can lead to predictable and anomalous electronic behaviors.
• The observed anomalous diamagnetic current in Altan-[10,5]-coronene warrants further theoretical and experimental investigation.