Supramolecular trap for a transient corannulene trianion

Area of Science:

• Supramolecular Chemistry
• Organometallic Chemistry
• Materials Science

Background:

• Corannulene (C20H10) is a unique polycyclic aromatic hydrocarbon with a bowl-shaped structure.
• Understanding the reduced states of corannulene is crucial for developing new functional materials.
• Transient states of molecules often exhibit novel reactivity and structural motifs.

Purpose of the Study:

• To achieve the first structural characterization of the transient triply-reduced state of corannulene.
• To elucidate the self-assembly behavior of corannulene trianions with cesium ions.
• To investigate the electronic structure and geometrical features of the resulting organometallic complex.

Main Methods:

• X-ray crystallography was employed to determine the precise atomic arrangement.
• Corannulene was reduced using metallic cesium to generate the trianions.
• In-depth theoretical calculations (e.g., DFT) were performed to complement experimental data.

Main Results:

• The first structural characterization of the corannulene (C20H10) trianion (C20H10˙3-) was successfully obtained.
• A novel supramolecular sandwich-type assembly, [Cs+//(C20H103-)/4Cs+/(C20H103-)//Cs+], was discovered.
• Two triply-charged corannulene units encapsulated four cesium ions, with additional cesium ions in the external cavities.

Conclusions:

• The study reveals a unique organometallic self-assembly driven by the interaction of corannulene trianions and cesium cations.
• The findings provide fundamental insights into the structural and electronic properties of highly reduced polycyclic aromatic hydrocarbons.
• This work opens avenues for designing novel supramolecular architectures with potential applications in materials science.