Piperazine-Linked Covalent Organic Frameworks with High Electrical Conductivity.

Area of Science:

• Materials Science
• Organic Chemistry
• Nanotechnology

Background:

• Covalent organic frameworks (COFs) are crystalline porous polymers with diverse applications.
• Developing conductive COFs remains a challenge for advanced electronic applications.

Purpose of the Study:

• To synthesize and characterize novel piperazine-linked covalent organic frameworks (COFs).
• To investigate the electrical conductivity and charge transport properties of these new COFs.

Main Methods:

• Nucleophilic substitution reaction between octaminophthalocyanines and hexadecafluorophthalocyanines.
• Characterization of the 2D framework structure, porosity, and chemical stability.
• Measurement of electrical conductivity and carrier mobility.

Main Results:

• Successfully synthesized piperazine-linked COFs with tetragonal polygon sheets and 1D microporous channels.
• Achieved high electrical conductivity (up to 12.7 S m⁻¹ for films) and carrier mobility (35.4 cm² V⁻¹ s⁻¹).
• Demonstrated excellent chemical stability and permanent porosity.

Conclusions:

• Piperazine-linked COFs represent a new class of highly conductive porous materials.
• The ordered phthalocyanine columns and cationic radicals contribute to superior electrical properties.
• These findings set new benchmarks for conductivity and mobility in COFs, enabling potential electronic applications.