Modularly Precise Construction of B,N-Embedded Large-Sized Polycyclic Aromatic Hydrocarbon Nanographene

Area of Science:

• Organic Chemistry
• Materials Science
• Nanotechnology

Background:

• Boron- and nitrogen-doped nanographenes are promising materials for advanced electronic and optical applications.
• Developing scalable synthesis methods for large, well-defined doped nanographenes remains a significant challenge.

Purpose of the Study:

• To introduce a modular "fjord-stitching" reverse strategy for synthesizing large-sized B,N-embedded nanographenes.
• To characterize the structural, electronic, and photoluminescent properties of the synthesized compounds.

Main Methods:

• Utilized a "fjord-stitching" reverse strategy for modular synthesis.
• Employed single crystal X-ray diffraction for structural analysis.
• Measured photoluminescence quantum yield and determined bandgap properties.

Main Results:

• Successfully synthesized two large-sized B,N-embedded nanographenes: BN-TBTi and BN-TBTo.
• Both compounds demonstrated excellent stability and a nonzero bandgap.
• BN-TBTo exhibits a large C78B2N4 π-skeleton (approx. 2.4 x 1.5 nm) with decent photoluminescence quantum yield.

Conclusions:

• The "fjord-stitching" method is effective for preparing large, doped nanographenes.
• The synthesized BN-nanographenes possess favorable electronic and optical properties for potential applications.
• This work expands the scope of synthetic strategies for functional carbon nanomaterials.