π-Extended Nitrogen-Doped Molecular Bowls Comprising Adjacent Pentagons

Area of Science:

• Organic Chemistry
• Materials Science
• Supramolecular Chemistry

Background:

• Classical buckybowls like corannulene are well-studied.
• Research on molecular bowls with double neighboring pentagonal rings is limited.

Purpose of the Study:

• To synthesize novel nitrogen-doped molecular bowls with adjacent pentagonal motifs.
• To investigate the impact of extended π-conjugation on molecular curvature and electronic properties.
• To explore the potential for fullerene binding.

Main Methods:

• Synthesis of nitrogen-doped molecular bowls.
• Analysis of molecular curvature using bowl-depth and π-orbital axis vector angles.
• Spectroscopic analysis (absorption and emission) to study electronic properties.
• Computational studies to determine inversion energy barriers.
• Solution-phase binding studies with fullerene C60.

Main Results:

• Successfully synthesized nitrogen-doped molecular bowls with adjacent pentagonal motifs.
• Preserved molecular curvature compared to parent structures.
• Extended π-conjugation led to bathochromic shifts in spectra and narrowed energy gaps.
• Enhanced aromatic character in fused pentagonal rings.
• Demonstrated binding capability with fullerene C60 in solution.

Conclusions:

• Nitrogen-doped molecular bowls with adjacent pentagonal rings offer unique structural and electronic properties.
• Extended π-conjugation is key to their enhanced optical and electronic characteristics.
• These novel bowls show promise for applications in supramolecular chemistry and materials science, including fullerene complexation.