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Title: CO2 hydrogenation catalyzed by iridium complexes with a proton-responsive ligand

Journal Article · · Inorganic Chemistry
DOI:https://doi.org/10.1021/ic502904q· OSTI ID:1182536
 [1];  [1];  [2];  [2];  [2];  [3];  [3];  [1]
  1. National Institute of Advanced Industrial Science and Technology, Ibaraki (Japan); Japan Science and Technology Agency, Saitama (Japan)
  2. National Institute of Advanced Industrial Science and Technology, Ibaraki (Japan)
  3. Brookhaven National Lab. (BNL), Upton, NY (United States)

In this study, the catalytic cycle for the production of formic acid by CO₂ hydrogenation and the reverse reaction has received renewed attention because they are viewed as offering a viable scheme for hydrogen storage and release. In this Forum Article, CO₂ hydrogenation catalyzed by iridium complexes bearing N^N-bidentate ligands is reported. We describe how a ligand containing hydroxyl groups as proton-responsive substituents enhances catalytic performance by an electronic effect of the oxyanions and a pendent-base effect through secondary coordination sphere interaction. In particular, [(Cp*IrCl)₂(TH2BPM)]Cl₂ (Cp* = pentamethyl cyclopentadienyl, TH2BPM = 4,4',6,6'-tetrahydroxy-2,2'-bipyrimidine) promotes enormously the catalytic hydrogenation of CO₂ by these synergistic effects under atmospheric pressure and at room temperature. Additionally, newly designed complexes with azole-type ligands are applied to CO₂ hydrogenation. The catalytic efficiencies of the azole-type complexes are much higher than that of the unsubstituted bipyridine complex [Cp*Ir(bpy)(OH₂)]SO₄. Furthermore, the introduction of one or more hydroxyl groups into ligands such as 2-pyrazolyl-6-hydroxypyridine, 2-pyrazolyl-4,6-dihydroxyl pyrimidine, and 4-pyrazolyl-2,6-dihydroxyl pyrimidine enhanced catalytic activity. It is clear that the incorporation of electron-donating hydroxyl groups into proton-responsive ligands is effective for promoting the hydrogenation of CO₂.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC00112704
OSTI ID:
1182536
Report Number(s):
BNL-107637-2015-JA; R&D Project: CO026; KC0304030
Journal Information:
Inorganic Chemistry, Vol. 54, Issue 11; ISSN 0020-1669
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 99 works
Citation information provided by
Web of Science

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Efficient Hydrogen Storage and Production Using a Catalyst with an Imidazoline‐Based, Proton‐Responsive Ligand journal December 2016
Utilization of a Fluorescent Dye Molecule as a Proton and Electron Reservoir journal February 2018
A Precious Catalyst: Rhodium-Catalyzed Formic Acid Dehydrogenation in Water: A Precious Catalyst: Rhodium-Catalyzed Formic Acid Dehydrogenation in Water journal April 2019
Enhanced Hydrogen Generation from Formic Acid by Half-Sandwich Iridium(III) Complexes with Metal/NH Bifunctionality: A Pronounced Switch from Transfer Hydrogenation journal August 2015
Half‐sandwich ruthenium complexes with S chiff base ligands bearing a hydroxyl group: Preparation, characterization and catalytic activities journal November 2019
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