A multi-stimuli responsive ruthenium complex for catalytic water oxidation.

Area of Science:

• Coordination Chemistry
• Photochemistry
• Catalysis

Background:

• Ruthenium complexes are versatile catalysts.
• Multi-stimuli-responsive materials offer advanced functionalities.
• Controlling catalytic activity with external stimuli is crucial for developing smart catalytic systems.

Purpose of the Study:

• To synthesize a ruthenium complex with multi-stimuli-responsive isomerization.
• To investigate the complex's catalytic activity toward water oxidation under different stimuli.
• To elucidate the mechanism of responsiveness and identify key structural features.

Main Methods:

• Synthesis of a novel ruthenium complex.
• Spectroscopic analysis to confirm isomerization.
• Catalytic testing for water oxidation under visible-light irradiation and heat.
• Density Functional Theory (DFT) calculations.

Main Results:

• The synthesized ruthenium complex demonstrated multi-stimuli-responsive isomerization.
• Visible-light irradiation induced photoisomerization, altering catalytic activity.
• Thermal treatment triggered back-isomerization, restoring catalytic activity.
• DFT calculations identified a pendant moiety as critical for controlling catalytic performance.

Conclusions:

• A novel ruthenium complex exhibits tunable catalytic activity for water oxidation via photo- and thermal-isomerization.
• The pendant moiety plays a crucial role in modulating the catalytic response.
• This work presents a promising platform for developing smart, stimuli-responsive catalytic systems.