Organic Radical-Linked Covalent Triazine Framework with Paramagnetic Behavior

Area of Science:

• Materials Science
• Organic Chemistry
• Nanotechnology

Background:

• Developing multifunctional organic materials with tailored porosity and magnetic properties is crucial for advanced applications.
• Potential applications include dynamic nuclear polarization-nuclear magnetic resonance, catalysis, and magnetic separation.

Purpose of the Study:

• To synthesize and characterize a novel covalent triazine framework incorporating polychlorotriphenylmethyl radicals.
• To investigate the material's porosity, magnetic properties, and electronic structure for potential applications.

Main Methods:

• Synthesis of polychlorotriphenylmethyl radical-linked covalent triazine framework (PTMR-CTF).
• Nitrogen (N2) sorption analysis to determine pore sizes.
• Electron spin resonance (ESR) and superconducting quantum interference device-vibrating sample magnetometer (SQUID-VSM) for magnetic characterization.
• Density functional theory (DFT) calculations to study spin density and electronic structure.

Main Results:

• Successful synthesis of PTMR-CTF with two distinct micropore sizes.
• Confirmation of unpaired electrons (carbon radicals) via ESR and SQUID-VSM.
• Demonstration of spin-half paramagnetism with a high spin concentration of approximately 2.63 × 10^23 spins/mol.
• DFT calculations elucidated the origin of magnetic moments.

Conclusions:

• PTMR-CTF is a promising multifunctional organic material with tunable porosity and significant magnetic properties.
• The material's characteristics make it suitable for applications in dynamic nuclear polarization-nuclear magnetic resonance, catalysis, and magnetic separation.
• Further research into PTMR-CTF could lead to advancements in these fields.