Asymmetric Saddle-Shaped Nanographenes Integrating Helicene and Heptagon Motifs: Synthesis and Chiroptical Properties.

Key Points

• The aim is to synthesize and analyze the chiroptical properties of curved nanographenes embedding helicene and heptagon motifs.
• Synthesis of nanographenes via Scholl-type oxidative cyclodehydrogenation
• Single-crystal X-ray diffraction analysis
• Density functional theory (DFT) calculations for isomerization barriers
• Enantiomers resolution to assess optical properties
• Curved heptagon-embedded nanographenes were successfully synthesized
• Significant distortion noted in structures with helicene due to synthesis
• Enantiomers of compound 11 had a high isomerization barrier of 38.54 kcal/mol
• Mirror-image circular dichroism and circularly polarized luminescence spectra were displayed