1. A Highly Durable, Self-Photosensitized Mononuclear Ruthenium Catalyst for CO2 Reduction
- Author
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Takeshi Morikawa, Shunsuke Sato, Keita Sekizawa, Taku Wakabayashi, Kenji Kamada, Jieun Jung, Susumu Saito, and Hiroko Okuwa
- Subjects
chemistry.chemical_classification ,Base (chemistry) ,Formic acid ,Induction period ,Organic Chemistry ,chemistry.chemical_element ,Medicinal chemistry ,Catalysis ,Ruthenium ,chemistry.chemical_compound ,chemistry ,Carbon dioxide ,Photosensitizer ,Carbon monoxide - Abstract
A novel mononuclear ruthenium (Ru) complex bearing a PNNP-type tetradentate ligand is introduced here as a self-photosensitized catalyst for the reduction of carbon dioxide (CO2). When the pre-activation of the Ru complex by reaction with a base was carried out, an induction period of catalyst almost disappeared and the catalyst turnover numbers (TONs) over a reaction time of 144 h reached 307 and 489 for carbon monoxide (CO) and for formic acid (HCO2H), respectively. The complex has a long lifespan as a dual photosensitizer and reduction catalyst, due to the sterically bulky and structurally robust (PNNP)Ru framework. Isotope-labeling experiments under 13CO2 atmosphere indicate that CO and HCO2H were both produced from CO2.
- Published
- 2021