CO2 Hydrogenation Catalyzed by Iridium Complexes with a Proton-Responsive Ligand
Naoya Onishi1,2, Shaoan Xu1,2, Yuichi Manaka1
1†National Institute of Advanced Industrial Science and Technology, Tsukuba Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan.
Iridium complexes with hydroxy-functionalized ligands efficiently catalyze carbon dioxide (CO2) hydrogenation for hydrogen storage. These ligands enhance catalytic activity through electronic and secondary coordination sphere effects, enabling efficient CO2 conversion at room temperature.
Area of Science:
- Catalysis
- Green Chemistry
- Materials Science
Background:
- CO2 hydrogenation is crucial for hydrogen storage and release.
- Iridium complexes are investigated for CO2 conversion catalysis.
- Ligand design significantly impacts catalyst performance.
Purpose of the Study:
- To develop efficient iridium catalysts for CO2 hydrogenation.
- To investigate the role of proton-responsive ligands in catalysis.
- To enhance catalytic activity through ligand functionalization.
Main Methods:
- Synthesis of iridium complexes with N^N-bidentate ligands.
- Catalytic testing of CO2 hydrogenation in aqueous media.
- Structural and electronic analysis of ligand effects.
Main Results:
- [(Cp*IrCl)2(TH2BPM)]Cl2 demonstrated high catalytic activity for CO2 hydrogenation.
- Hydroxy-functionalized azole-type ligands significantly enhanced catalytic efficiency.
- Synergistic effects from electronic and pendent-base interactions were observed.
Conclusions:
- Proton-responsive ligands with hydroxy groups are effective for CO2 hydrogenation.
- Ligand design, particularly with electron-donating functionalities, is key to improving iridium-catalyzed CO2 conversion.
- This work offers a promising route for hydrogen storage and CO2 utilization.
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