Regioselective functionalization of core-persubstituted perylene diimides

Area of Science:

• Organic Chemistry
• Materials Science
• Photophysics

Background:

• Perylene diimides (PDIs) are important chromophores with tunable optoelectronic properties.
• Functionalization of PDIs is crucial for developing advanced materials.
• Achieving regioselective functionalization of per-substituted PDIs remains a challenge.

Purpose of the Study:

• To develop a versatile building block for regioselective functionalization of perylene diimides.
• To synthesize novel chromophores with unique optoelectronic properties.
• To explore new molecular architectures based on perylene diimide scaffolds.

Main Methods:

• Synthesis of tetrabromotetrachloro-perylene-3,4:9,10-tetracarboxylic acid dianhydride (Br4Cl4-PTCDA).
• Regioselective functionalization reactions utilizing the Br4Cl4-PTCDA building block.
• Palladium-catalyzed intramolecular ring fusion reactions.

Main Results:

• Efficient regioselective functionalization of perylene diimides was achieved.
• A series of novel chromophores with impressive optoelectronic properties were synthesized.
• Unique propeller-shaped biscarbazole[2,3-b]carbazole diimides with six annulated rings were successfully obtained via palladium-catalyzed cyclization.

Conclusions:

• The developed Br4Cl4-PTCDA building block is a versatile platform for creating complex perylene diimide derivatives.
• The synthesized chromophores exhibit promising optoelectronic characteristics.
• The study demonstrates a novel route to propeller-shaped polycyclic aromatic systems.