Tubularenes.

Area of Science:

• Organic chemistry
• Materials science
• Nanotechnology

Background:

• Conjugated carbon-based nanomaterials are of significant interest.
• Developing novel nanotube architectures remains a challenge.

Purpose of the Study:

• To synthesize and characterize new conjugated, conformationally rigid, and electroactive carbon-based nanotubes, termed tubularenes.
• To explore a novel scaffolding approach for creating nanotube architectures.

Main Methods:

• Synthesis of tubularenes from a resorcin[n _b]arene base.
• One-pot eight-fold C-C bond formation via Suzuki-Miyaura cross-coupling.
• Density Functional Theory (DFT) calculations to assess strain energy.

Main Results:

• Successful synthesis of tubularenes, a novel class of conjugated nanotubes.
• Tubularenes exhibit conformational rigidity and electroactivity.
• DFT calculations revealed significant strain energy (>90 kcal mol^-1).
• The architectures possess large internal void spaces (>260 ų) and are fluorescent.
• Tubularenes can accept up to 4 electrons.

Conclusions:

• This work presents the first scaffolding approach for conjugated nanotube architectures.
• Tubularenes represent a new class of functional carbon nanomaterials with potential applications.