Using Hansen solubility parameters to study the encapsulation of caffeine in MOFs

Area of Science:

• Materials Science
• Supramolecular Chemistry
• Chemical Engineering

Background:

• Hansen solubility parameters (HSP) are widely used for solvent-polymer interactions.
• Metal-organic frameworks (MOFs) are porous materials with potential for host-guest chemistry.
• Applying HSP to MOFs could advance rational design of host-guest systems.

Purpose of the Study:

• To initiate the application of HSP to study host-guest interactions in MOFs.
• To investigate caffeine encapsulation within ZIF-8 and NH2-MIL-88B(Fe) MOFs using an HSP approach.

Main Methods:

• Simplified HSP calculations focusing on caffeine-ligand interactions.
• Assumed that caffeine-ligand HSP distance is key for MOF host-guest complex formation.
• Evaluated the potential of HSP for predicting MOF encapsulation behavior.

Main Results:

• Demonstrated the initial feasibility of applying HSP to MOF host-guest systems.
• Identified the potential dominance of ligand interactions in caffeine encapsulation.
• Highlighted the need for further development and validation of the HSP approach for MOFs.

Conclusions:

• The HSP approach shows significant potential for understanding and designing MOF-based host-guest systems.
• Further research is required to refine HSP calculations for MOFs and validate their predictive power.
• This work lays the groundwork for using HSP in the rational design of MOF materials.