Permanent Porosity in the Room-Temperature Magnet and Magnonic Material V(TCNE)₂

Area of Science:

• Materials Science
• Magnetism
• Nanotechnology

Background:

• Developing materials with both permanent porosity and high-temperature magnetic order is crucial for fundamental physics and emerging technologies.
• Molecule-based magnets offer tunable properties but often lack permanent porosity.

Purpose of the Study:

• To create a room-temperature magnet with permanent microporosity.
• To investigate the gas adsorption properties and magnetic behavior of the porous magnet.

Main Methods:

• Synthesized V(TCNE)2·0.95CH2Cl2 via solution-phase reaction.
• Desolvated the precursor to obtain porous V(TCNE)2.
• Characterized magnetic properties using variable-temperature magnetization data and Bloch fit.
• Assessed porosity and gas adsorption using Langmuir surface area measurements and gas sorption analysis.

Main Results:

• V(TCNE)2 exhibits a characteristic temperature (T*) of 590 K and a Langmuir surface area of 850 m²/g.
• The porous V(TCNE)2 framework adsorbs small gas molecules (H2, N2, O2, CO2, ethane, ethylene).
• Gas adsorption slightly modulates the magnetic properties, with ethylene causing a significant decrease in T*.

Conclusions:

• Demonstrated the first microporous room-temperature magnet.
• Highlighted the potential for incorporating small molecules, including molecular qubits, into porous magnetic frameworks.
• Opened avenues for advanced applications in materials science and nanotechnology.