Fully Fused Hydrazine-Embedded Nanographene with Near-Infrared Chiroptical Emission

Area of Science:

• Organic Chemistry
• Materials Science
• Nanotechnology

Background:

• Embedding hydrazine into graphenic networks presents synthetic challenges.
• Hydrazine incorporation offers unique redox activity and antiaromatic character.

Purpose of the Study:

• To report the first synthesis of a fully fused hydrazine-embedded nanographene.
• To characterize its structure, redox properties, and optical functions.

Main Methods:

• Dehydrocyclization strategy for synthesis.
• Single-crystal X-ray diffraction for structural analysis.
• Spectroscopic and electrochemical methods for property evaluation.

Main Results:

• Successfully synthesized a helical, saddle-shaped nanographene (1) with an embedded hydrazine moiety.
• Observed near-infrared (NIR) absorption (830 nm) and emission (879 nm).
• Demonstrated multistep redox processes, oxidation-induced planarization, and an antiaromatic-to-aromatic transition.

Conclusions:

• Hydrazine embedment is a viable strategy for constructing atomically precise nanocarbons.
• The synthesized nanographene exhibits unique redox and NIR optical functionalities.
• First observation of circularly polarized luminescence from a helical nanographene in the NIR region.