Efficient Cp*Ir Catalysts with Imidazoline Ligands for CO 2 Hydrogenation: Cp*Ir Catalysts with Imidazoline Ligands for CO 2 Hydrogenation
Abstract
Here, we report newly developed iridium catalysts with electron-donating imidazoline moieties as ligands for the hydrogenation of CO2 to formate in aqueous solution. Interestingly, these new complexes promote CO2 hydrogenation much more effectively than their imidazole analogues and exhibit a turnover frequency (TOF) of 1290 h–1 for the bisimidazoline complex compared to that of 20 h–1 for the bisimidazole complex at 1 MPa and 50 °C. Additionally, the hydrogenation proceeds smoothly even under atmospheric pressure at room temperature. The TOF of 43 h–1 for the bisimidazoline complex is comparable to that of a dinuclear complex (70 h–1, highest TOF reported) [Nat. Chem. 2012, 4, 383], which incorporates proton-responsive ligands with pendent-OH groups in the second coordination sphere. The catalytic activity of the complex with an N-methylated imidazoline moiety is much the same as that of the corresponding pyridylimidazoline analogue. Our result and the UV/Vis titrations of the imidazoline complexes indicate that the high activity is not attributable to the deprotonation of NH on the imidazoline under the reaction conditions.
- Authors:
-
- National Inst. of Advanced Industrial Science and Technology (AIST), Tsukuba (Japan)
- Dalian Univ. of Technology, Panjin (China). School of Petroleum and Chemical Engineering
- Brookhaven National Lab. (BNL), Upton, NY (United States). Chemistry Dept.
- Publication Date:
- Research Org.:
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1335387
- Report Number(s):
- BNL-111790-2016-JA
Journal ID: ISSN 1434-1948; R&D Project: CO026; KC0304030
- Grant/Contract Number:
- SC00112704
- Resource Type:
- Accepted Manuscript
- Journal Name:
- European Journal of Inorganic Chemistry
- Additional Journal Information:
- Journal Volume: 2015; Journal Issue: 34; Journal ID: ISSN 1434-1948
- Publisher:
- ChemPubSoc Europe
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; homogeneous catalysis; Ir complex; CO2 hydrogenation
Citation Formats
Xu, Shaoan, Onishi, Naoya, Tsurusaki, Akihiro, Manaka, Yuichi, Wang, Wan-Hui, Muckerman, James T., Fujita, Etsuko, and Himeda, Yuichiro. Efficient Cp*Ir Catalysts with Imidazoline Ligands for CO 2 Hydrogenation: Cp*Ir Catalysts with Imidazoline Ligands for CO 2 Hydrogenation. United States: N. p., 2015.
Web. doi:10.1002/ejic.201501030.
Xu, Shaoan, Onishi, Naoya, Tsurusaki, Akihiro, Manaka, Yuichi, Wang, Wan-Hui, Muckerman, James T., Fujita, Etsuko, & Himeda, Yuichiro. Efficient Cp*Ir Catalysts with Imidazoline Ligands for CO 2 Hydrogenation: Cp*Ir Catalysts with Imidazoline Ligands for CO 2 Hydrogenation. United States. https://doi.org/10.1002/ejic.201501030
Xu, Shaoan, Onishi, Naoya, Tsurusaki, Akihiro, Manaka, Yuichi, Wang, Wan-Hui, Muckerman, James T., Fujita, Etsuko, and Himeda, Yuichiro. Mon .
"Efficient Cp*Ir Catalysts with Imidazoline Ligands for CO 2 Hydrogenation: Cp*Ir Catalysts with Imidazoline Ligands for CO 2 Hydrogenation". United States. https://doi.org/10.1002/ejic.201501030. https://www.osti.gov/servlets/purl/1335387.
@article{osti_1335387,
title = {Efficient Cp*Ir Catalysts with Imidazoline Ligands for CO 2 Hydrogenation: Cp*Ir Catalysts with Imidazoline Ligands for CO 2 Hydrogenation},
author = {Xu, Shaoan and Onishi, Naoya and Tsurusaki, Akihiro and Manaka, Yuichi and Wang, Wan-Hui and Muckerman, James T. and Fujita, Etsuko and Himeda, Yuichiro},
abstractNote = {Here, we report newly developed iridium catalysts with electron-donating imidazoline moieties as ligands for the hydrogenation of CO2 to formate in aqueous solution. Interestingly, these new complexes promote CO2 hydrogenation much more effectively than their imidazole analogues and exhibit a turnover frequency (TOF) of 1290 h–1 for the bisimidazoline complex compared to that of 20 h–1 for the bisimidazole complex at 1 MPa and 50 °C. Additionally, the hydrogenation proceeds smoothly even under atmospheric pressure at room temperature. The TOF of 43 h–1 for the bisimidazoline complex is comparable to that of a dinuclear complex (70 h–1, highest TOF reported) [Nat. Chem. 2012, 4, 383], which incorporates proton-responsive ligands with pendent-OH groups in the second coordination sphere. The catalytic activity of the complex with an N-methylated imidazoline moiety is much the same as that of the corresponding pyridylimidazoline analogue. Our result and the UV/Vis titrations of the imidazoline complexes indicate that the high activity is not attributable to the deprotonation of NH on the imidazoline under the reaction conditions.},
doi = {10.1002/ejic.201501030},
journal = {European Journal of Inorganic Chemistry},
number = 34,
volume = 2015,
place = {United States},
year = {Mon Nov 09 00:00:00 EST 2015},
month = {Mon Nov 09 00:00:00 EST 2015}
}
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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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