Cucurbituril-Shaped Cd₁₈(triazolate)₁₂ Unit-Based Metal-Organic Framework Exhibiting an C₂H₂/CO₂ Separation Ability

Area of Science:

• Materials Science
• Chemistry
• Nanotechnology

Background:

• Metal-organic frameworks (MOFs) are crystalline porous materials with diverse applications.
• Developing novel MOFs with specific functionalities, such as gas separation, is an active research area.
• Efficient separation of acetylene (C2H2) and carbon dioxide (CO2) is crucial for industrial processes.

Purpose of the Study:

• To synthesize and characterize a new metal-organic framework, JXNU-18.
• To investigate the gas adsorption and separation properties of JXNU-18, particularly for C2H2/CO2 mixtures.
• To explore the potential applications of JXNU-18 in gas separation technologies.

Main Methods:

• Synthesis of the MOF JXNU-18 using cadmium ions, triazolate, and 2,5-thiophenedicarboxylate ligands.
• Structural characterization of JXNU-18, including its unique Cd18(TrZ)12 secondary building units.
• Gas adsorption experiments and dynamic gas breakthrough experiments to evaluate separation performance.
• Computational simulations to understand pore structure and C2H2 trapping mechanisms.

Main Results:

• Successful construction of JXNU-18 with unprecedented cucurbituril-shaped Cd18(TrZ)12 units.
• JXNU-18 exhibits efficient separation of C2H2 from CO2, confirmed by adsorption and breakthrough experiments.
• Computational simulations reveal that tubular pores facilitate selective C2H2 trapping.

Conclusions:

• The novel MOF JXNU-18, built from unique Cd18(TrZ)12 units, demonstrates significant C2H2/CO2 separation ability.
• The specific pore architecture of JXNU-18 is key to its selective gas adsorption properties.
• JXNU-18 holds potential for practical applications in industrial gas separation.