Assembling Metal-Organic Frameworks in Ionic Liquids and Supercritical CO₂

Area of Science:

• Materials Science
• Green Chemistry
• Chemical Engineering

Background:

• Ionic liquids (ILs) and supercritical carbon dioxide (scCO2) are recognized as environmentally friendly solvents with adjustable properties.
• The synthesis of metal-organic frameworks (MOFs) using ILs and scCO2 is an emerging research area.
• ILs offer excellent solubility and design flexibility for diverse MOF synthesis.
• scCO2 provides tunable solvent power and efficient mass transfer for MOF applications like activation and aerogel formation.

Approach:

• This review synthesizes recent advancements in MOF synthesis utilizing ILs.
• It details the application of scCO2 as a solvent or co-solvent in MOF synthesis and processing.
• The synergistic effects and novel fabrication routes enabled by combining ILs and scCO2 for MOF synthesis are discussed.

Key Points:

• ILs serve as effective media for synthesizing various MOFs due to their broad solubility and tunable nature.
• scCO2 offers advantages in MOF activation, aerogel synthesis, and construction, replacing traditional organic solvents.
• The combined use of ILs and scCO2 presents innovative pathways for creating advanced MOF structures.

Conclusions:

• The integration of ILs and scCO2 provides a powerful and versatile platform for the development of novel MOF materials.
• This approach aligns with green chemistry principles, offering sustainable alternatives for MOF synthesis and processing.
• Future research directions in MOF fabrication using these green solvent systems are highlighted.