Closed Aromatic Tubes-Capsularenes.

Area of Science:

• Organic Chemistry
• Supramolecular Chemistry
• Materials Science

Background:

• Molecular cages and containers are crucial for host-guest chemistry and molecular recognition.
• Developing synthetic routes to novel molecular architectures with unique properties is an ongoing challenge.

Purpose of the Study:

• To introduce a novel synthetic methodology for creating closed-tube arene structures, termed capsularenes.
• To explore the structural, thermal, and optoelectronic properties of these new molecular entities.

Main Methods:

• Synthesis of vase-shaped molecular baskets functionalized with dimethoxyethane acetal groups.
• Acid-catalyzed intramolecular cyclization of acetals to form aliphatic aldehydes, followed by trioxane ring formation.
• Characterization using X-Ray crystallography, electron diffraction, spectroscopy (NMR, UV/Vis, fluorescence), cyclic voltammetry, and thermogravimetry.

Main Results:

• A highly efficient synthetic route to capsularenes of varying sizes (0.7×0.9 nm to 0.7×1.4 nm) was established.
• Capsularenes exhibit exceptional rigidity, unique topology, and significant thermal stability.
• Preliminary investigations suggest tuneable optoelectronic characteristics.

Conclusions:

• Capsularenes represent a new class of molecular architectures with promising properties.
• The developed synthetic method offers a versatile platform for creating tailored capsularenes.
• These compounds hold potential for applications in organic electronics and supramolecular chemistry.