Cyclopentannulated Decacyclenes as Carbon-Based Multistage Electron Acceptors

Area of Science:

• Organic Chemistry
• Materials Science
• Electrochemistry

Background:

• Decacyclenes are polycyclic aromatic hydrocarbons with interesting electronic properties.
• Developing efficient electron acceptors is crucial for organic electronics.
• Tuning redox properties of π-conjugated systems remains a key challenge.

Purpose of the Study:

• To synthesize novel cyclopentannulated decacyclenes.
• To investigate their potential as multistage electron acceptors.
• To understand the impact of cyclopentannulation on redox properties.

Main Methods:

• Modular synthesis via Yamamoto cyclotrimerization.
• π-expansion through oxidative cyclodehydrogenation.
• Electrochemical analysis and X-ray crystallography.
• Density functional theory (DFT) calculations.

Main Results:

• Successfully synthesized a series of cyclopentannulated decacyclenes with tunable substituents (fluoro, methoxy, tert-butyl).
• X-ray crystallography revealed propeller-shaped structures and columnar packing.
• Compounds exhibited up to six reversible reductions in a narrow potential range (-1.45 to -2.86 V).
• Demonstrated significantly enhanced electron-accepting ability compared to parent decacyclene.

Conclusions:

• Cyclopentannulation dramatically improves the electron-accepting properties of decacyclenes.
• These compounds are promising candidates for multistage electron acceptors in various applications.
• The synthetic strategy allows for tailored functionalization to optimize performance.