Carbon Dioxide Hydrogenation and Formic Acid Dehydrogenation Catalyzed by Iridium Complexes Bearing Pyridyl-pyrazole Ligands: Effect of an Electron-donating Substituent on the Pyrazole Ring on the Catalytic Activity and Durability

Onishi, Naoya; Kanega, Ryoichi; Fujita, Etsuko; Himeda, Yuichiro

doi:10.1002/adsc.201801323

Title: Carbon Dioxide Hydrogenation and Formic Acid Dehydrogenation Catalyzed by Iridium Complexes Bearing Pyridyl-pyrazole Ligands: Effect of an Electron-donating Substituent on the Pyrazole Ring on the Catalytic Activity and Durability

Journal Article · 02 November 2018 · Advanced Synthesis & Catalysis (ACS)

DOI: https://doi.org/10.1002/adsc.201801323 · OSTI ID:1489353

Onishi, Naoya ^[1]; Kanega, Ryoichi ^[1];

^[2]; Himeda, Yuichiro ^[1]

National Institute of Advanced Industrial Science and Technology, Ibaraki (Japan)
Brookhaven National Lab. (BNL), Upton, NY (United States)

Abstract Cp*Ir (Cp*=pentamethylcyclopentadienyl) complexes with an N , N ‐bidentate ligand such as 2,2′‐bipyridine serve as catalysts for both carbon dioxide (CO ₂ ) hydrogenation to formate and formic acid dehydrogenation in water. Previously, it was shown that the introduction of an electron‐donating substituent on 2,2′‐bipyridine is an effective method to improve the catalytic activity. Especially, the highly electron‐donating hydroxyl (OH) substituent performs much better than other substituents such as methyl or methoxy under basic conditions. However, the introduction of an OH substituent on the ligand has been limited to six‐membered rings such as pyridine or pyrimidine. These results prompted us to develop a new ligand comprising a pyridyl‐pyrazole with an OH group on the pyrazole moiety for Cp*Ir‐catalyzed CO ₂ hydrogenation and formic acid dehydrogenation. The resultant catalyst showed high catalytic activity in CO ₂ hydrogenation and excellent robustness in formic acid dehydrogenation with a turnover number of 10 million. magnified image

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE

Grant/Contract Number:: SC0012704

OSTI ID:: 1489353

Alternate ID(s):: OSTI ID: 1483733

Report Number(s):: BNL-210836-2018-JAAM

Journal Information:: Advanced Synthesis & Catalysis (ACS), Vol. 361, Issue 2; ISSN 1615-4150

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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37 INORGANIC
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Title: Carbon Dioxide Hydrogenation and Formic Acid Dehydrogenation Catalyzed by Iridium Complexes Bearing Pyridyl-pyrazole Ligands: Effect of an Electron-donating Substituent on the Pyrazole Ring on the Catalytic Activity and Durability

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