A bis-exTTF macrocyclic receptor that associates C60 with micromolar affinity

Area of Science:

• Supramolecular Chemistry
• Organic Chemistry
• Materials Science

Background:

• Fullerenes, such as C(60), are important carbon allotropes with unique electronic properties.
• Developing efficient receptors for fullerenes is crucial for their separation, sensing, and application in materials science.
• Previous extended tetrathiafulvalene (exTTF)-based receptors have shown limited binding affinities for C(60).

Purpose of the Study:

• To design and synthesize a novel exTTF-based macrocyclic receptor with enhanced affinity for C(60).
• To investigate the binding properties of the new receptor in solution.
• To establish a new benchmark for C(60) binding constants using exTTF-based systems.

Main Methods:

• Synthesis of a new exTTF-based macrocyclic compound.
• Spectroscopic titration experiments (e.g., UV-Vis, NMR) to study host-guest complexation.
• Determination of binding constants using Benesi-Hildebrand or similar methods in chlorobenzene.

Main Results:

• The synthesized exTTF-based macrocyclic receptor effectively associates with C(60) fullerenes.
• A high binding constant exceeding 10^6 M(-1) was measured in chlorobenzene at room temperature.
• This represents a significant improvement of three orders of magnitude compared to previous exTTF-based receptors.

Conclusions:

• The novel exTTF-based macrocyclic receptor demonstrates exceptional binding affinity for C(60).
• This work provides one of the highest reported binding constants for C(60) complexation.
• The developed receptor holds promise for advanced applications in fullerene chemistry and materials science.