Stimuli-responsive photoswitch-actinide binding: a match made in MOFs

Area of Science:

• Coordination Chemistry
• Photochemistry
• Materials Science

Background:

• Actinide-ligand binding is crucial for nuclear medicine and recycling.
• Controlling these interactions is key to developing advanced nuclear technologies.

Purpose of the Study:

• To report the first instance of actinide binding modes controlled by external stimuli via photochromic moieties.
• To investigate the thermodynamic and kinetic aspects of stimulus-responsive actinide-ligand systems.

Main Methods:

• Utilized isothermal titration calorimetry, crystallography, spectroscopy, and theoretical modeling.
• Examined actinide compounds including thorium, uranium, and plutonium.
• Investigated binding in both solution and metal-organic framework (MOF) matrices.

Main Results:

• Demonstrated that actinide binding modes can be controlled by photochromic moieties.
• Quantified changes in photoswitch isomerization constants and enthalpies upon metal coordination.
• Successfully incorporated this concept into a metal-organic framework (MOF).

Conclusions:

• The developed concept provides a novel approach to stimuli-responsive actinide-based platforms.
• This work opens new avenues for addressing challenges in f-block chemistry.
• Potential applications include nuclear medicine and nuclear waste management.