A C216-Nanographene Molecule with Defined Cavity as Extended Coronoid

Area of Science:

• Materials Science
• Organic Chemistry
• Nanotechnology

Background:

• Graphene exhibits unique electronic and chemical properties due to its 2D structure.
• Understanding the impact of structural modifications, such as holes, is crucial for advanced applications.
• Polycyclic Aromatic Hydrocarbons (PAHs) are fundamental building blocks in materials science.

Purpose of the Study:

• To synthesize and characterize the first coronoid nanographene molecule with a defined cavity.
• To establish a model system for investigating the influence of holes on graphene properties.
• To explore the synthetic pathways for creating complex, hole-containing nanographenes.

Main Methods:

• Multi-step organic synthesis involving Yamamoto coupling and Diels-Alder reactions.
• Oxidative cyclodehydrogenation for the final ring closure.
• Structural and spectroscopic characterization using MALDI-TOF, FTIR, Raman, and UV-vis spectroscopy.
• Density Functional Theory (DFT) simulations for theoretical validation.

Main Results:

• Successful synthesis of the coronoid nanographene C216 molecule.
• Unambiguous validation of the molecular structure, including the presence of a defined cavity.
• Demonstration of a feasible synthetic route to complex nanographenes.
• Spectroscopic data consistent with DFT computational predictions.

Conclusions:

• The synthesized C216 molecule serves as a pioneering model for studying hole effects in graphene.
• The synthetic methodology is adaptable for creating related nanographene structures.
• This work opens new avenues for designing functional materials based on hole-engineered graphene.