Stimuli-Modulated Metal-Organic Framework (MOF) Reactivity toward a Three-Component Coupling Reaction

Area of Science:

• Materials Science
• Catalysis
• Photochemistry

Background:

• Stimuli-responsive heterogeneous catalysis offers in situ regulation and improved recyclability.
• Controlling metal oxidation states is key to modulating catalytic activity.

Purpose of the Study:

• To report the first light-responsive heterogeneous catalyst for three-component coupling reactions.
• To demonstrate photochromic-molecule-directed modulation of copper oxidation states in MOFs.
• To establish correlations between photoisomerization, metal oxidation states, and catalytic reactivity.

Main Methods:

• Covalent integration of a spiropyran derivative into a metal-organic framework (MOF) scaffold.
• Comprehensive spectroscopic analysis and theoretical modeling.
• Testing catalytic performance in three-component coupling reactions under various conditions.

Main Results:

• Demonstrated light-induced modulation of copper oxidation states in MOFs via spiropyran isomerization.
• Established a direct link between photochromic moiety isomerization and catalytic reactivity.
• Confirmed recyclability and sustained catalytic activity of the photochromic MOF catalyst over multiple cycles.
• Successfully synthesized 12 diverse compounds, including pharmaceuticals, with high yields.

Conclusions:

• Developed a novel photochromic MOF-based catalyst for noninvasive control of chemical reactivity.
• Established a new design principle for adaptive catalytic systems.
• Showcased a transformative pathway for controllable chemical synthesis via on-demand metal oxidation state modulation.