A Macrocyclization of 1,8-Bis(dithiafulvenyl)pyrenes

Area of Science:

• Organic Chemistry
• Materials Science
• Supramolecular Chemistry

Background:

• Pyrene derivatives are known for their unique photophysical and electronic properties.
• Dithiafulvenyl (DTF) groups can impart redox activity to organic molecules.
• Controlling molecular architecture is key to designing advanced functional materials.

Purpose of the Study:

• To synthesize novel redox-active pyrene derivatives functionalized with dithiafulvenyl (DTF) end groups.
• To investigate the electronic properties and oxidative behavior of these new pyrene compounds.
• To explore the formation and characteristics of macrocyclic structures derived from these pyrene derivatives.

Main Methods:

• Synthesis of pyrene derivatives with DTF end groups at the 1 and 8 positions, directly or via phenylene bridges.
• Electrochemical studies to analyze stepwise electron transfers and redox behavior.
• Spectroscopic techniques (e.g., NMR, UV-Vis, Mass Spectrometry) for structural and electronic characterization.
• Molecular modeling to understand structural and supramolecular properties.

Main Results:

• Stepwise electron transfer was observed in 1,8-bis(DTF)pyrene, forming radical cation and dication species.
• Phenylene-extended bis(DTF)pyrene derivatives underwent cyclization to form a macrocyclic trimer via DTF oxidative coupling.
• The synthesized pyrene-based macrocycle exhibited distinct structural, electronic, and supramolecular properties.

Conclusions:

• Novel redox-active pyrene derivatives with tunable electronic properties were successfully synthesized.
• DTF oxidative coupling provides a viable route for constructing complex macrocyclic architectures from pyrene units.
• The pyrene-based macrocycle holds potential for applications in areas requiring redox-active and supramolecularly organized materials.