Synlett 2022; 33(12): 1137-1141
DOI: 10.1055/a-1709-0280
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Organic Photoredox Catalysis in Synthesis – Honoring Prof. Shunichi Fukuzumi’s 70th Birthday

A Highly Durable, Self-Photosensitized Mononuclear Ruthenium Catalyst for CO2 Reduction

Kenji Kamada
a   Department of Chemistry, Graduate School of Science, Nagoya University, Chikusa, Nagoya 464-8602, Japan
,
Hiroko Okuwa
a   Department of Chemistry, Graduate School of Science, Nagoya University, Chikusa, Nagoya 464-8602, Japan
,
Taku Wakabayashi
a   Department of Chemistry, Graduate School of Science, Nagoya University, Chikusa, Nagoya 464-8602, Japan
,
Keita Sekizawa
b   Toyota Central R&D Laboratories, Inc., Nagakute 480-1192, Japan
,
Shunsuke Sato
b   Toyota Central R&D Laboratories, Inc., Nagakute 480-1192, Japan
,
Takeshi Morikawa
b   Toyota Central R&D Laboratories, Inc., Nagakute 480-1192, Japan
,
Jieun Jung
a   Department of Chemistry, Graduate School of Science, Nagoya University, Chikusa, Nagoya 464-8602, Japan
,
Susumu Saito
a   Department of Chemistry, Graduate School of Science, Nagoya University, Chikusa, Nagoya 464-8602, Japan
c   Research Center for Materials Science (RCMS), Nagoya University, Chikusa, Nagoya 464-8602, Japan
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This work was supported by the Asahi Glass Foundation (Step-up-grant to S.S.), the Japan Society for the Promotion of Science (Scientific Research (B) 19H02713 to S.S. and Early-Career Scientists 21K14642 to J. J.), and partially by the Ministry of the Environment of the Government of Japan.


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.

Supporting Information



Publikationsverlauf

Eingereicht: 30. August 2021

Angenommen nach Revision: 29. November 2021

Accepted Manuscript online:
29. November 2021

Artikel online veröffentlicht:
05. Januar 2022

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