Energy and Distribution: A Frontier Orbital Landscape for BN-Embedded Polycyclic Aromatic Hydrocarbons

Area of Science:

• Materials Science
• Organic Chemistry
• Computational Chemistry

Background:

• Polycyclic aromatic hydrocarbons (PAHs) are crucial organic semiconductors.
• Boron and nitrogen (BN) incorporation into PAHs modulates their electronic structure.
• A unified understanding of BN-PAH electronic properties from a frontier molecular orbital (FMO) perspective is lacking.

Purpose of the Study:

• To present a conceptual framework for analyzing BN-embedded PAHs.
• To understand how BN incorporation affects frontier molecular orbitals (FMOs).
• To provide guiding principles for designing novel BN-embedded organic semiconductors.

Main Methods:

• Analysis based on the highest occupied molecular orbital-lowest unoccupied molecular orbital (HOMO-LUMO) gap.
• Assessment of the spatial distribution of frontier molecular orbitals.
• Conceptual framework integrating energy and orbital distribution.

Main Results:

• BN incorporation can either enlarge or narrow the HOMO-LUMO gap, influencing molecular stability and optical properties.
• BN-induced orbital redistribution significantly impacts chemical reactivity and charge-transport behavior.
• The proposed framework rationalizes diverse experimental observations in BN-PAHs.

Conclusions:

• The developed framework offers insights into BN-PAH electronic properties.
• Understanding FMO energy and distribution is key to controlling molecular behavior.
• This work provides guiding principles for the rational design of advanced organic electronic materials.