Fluorescent Zn(II)-Based Metal-Organic Framework: Interaction with Organic Solvents and CO₂ and Methane Capture

Area of Science:

• Materials Science
• Chemistry
• Nanotechnology

Background:

• Metal-organic frameworks (MOFs) are crucial for industrial and sensing applications due to their adsorption properties.
• Developing MOFs from sustainable, cost-effective ligands is essential for practical applications.
• Existing MOF fabrication processes can be complex and expensive.

Purpose of the Study:

• To synthesize a novel, structurally stable, and fluorescent metal-organic framework (MOF).
• To investigate the MOF's interactions with organic solvents and its gas sorption capabilities.
• To explore the potential of MOFs derived from sustainable ligands for gas adsorption.

Main Methods:

• Solvothermal synthesis using zinc nitrate and a TPDCA ligand derived from citric acid and cysteine.
• Single crystal X-ray diffraction and microscopic examination to determine MOF structure.
• Gas sorption analysis (CO2 and CH4) and solvent interaction studies.

Main Results:

• A novel two-dimensional MOF, QUF-001 (Zn[TPDCA]•DMF•0.25H2O), was successfully synthesized.
• QUF-001 exhibited fluorescence and structural changes upon interaction with various organic solvents.
• The MOF demonstrated significant sorption capacities for CO2 (1.6 mmol/g) and CH4 (8.1 mmol/g) at 298 K and 50 bar.

Conclusions:

• QUF-001 is a promising, thermally stable, fluorescent MOF synthesized from sustainable precursors.
• The MOF's structure is amenable to solvent inclusion, influencing its properties.
• QUF-001 shows potential for applications in gas adsorption and separation, particularly for CO2 and CH4.