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Li P, Liu JB, Han S, Deng W, Yao ZJ. Half-sandwich Ir (III) and Rh (III) complexes as catalysts for water oxidation with double-site. Appl Organomet Chem 2019. [DOI: 10.1002/aoc.5040] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Peng Li
- School of Chemical and Environmental Engineering; Shanghai Institute of Technology; Shanghai 201418 China
| | - Jin-Bao Liu
- Department of Science and Technology; Shanghai Urban Construction Vocational College; Shanghai 201415 China
| | - Sheng Han
- School of Chemical and Environmental Engineering; Shanghai Institute of Technology; Shanghai 201418 China
| | - Wei Deng
- School of Chemical and Environmental Engineering; Shanghai Institute of Technology; Shanghai 201418 China
| | - Zi-Jian Yao
- School of Chemical and Environmental Engineering; Shanghai Institute of Technology; Shanghai 201418 China
- State Key Laboratory of Coordination Chemistry; Nanjing University; Nanjing 210023 China
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Schilling M, Luber S. Computational Modeling of Cobalt-Based Water Oxidation: Current Status and Future Challenges. Front Chem 2018; 6:100. [PMID: 29721491 PMCID: PMC5915471 DOI: 10.3389/fchem.2018.00100] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2018] [Accepted: 03/20/2018] [Indexed: 12/19/2022] Open
Abstract
A lot of effort is nowadays put into the development of novel water oxidation catalysts. In this context, mechanistic studies are crucial in order to elucidate the reaction mechanisms governing this complex process, new design paradigms and strategies how to improve the stability and efficiency of those catalysts. This review is focused on recent theoretical mechanistic studies in the field of homogeneous cobalt-based water oxidation catalysts. In the first part, computational methodologies and protocols are summarized and evaluated on the basis of their applicability toward real catalytic or smaller model systems, whereby special emphasis is laid on the choice of an appropriate model system. In the second part, an overview of mechanistic studies is presented, from which conceptual guidelines are drawn on how to approach novel studies of catalysts and how to further develop the field of computational modeling of water oxidation reactions.
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Affiliation(s)
- Mauro Schilling
- Department of Chemistry, University of Zürich, Zurich, Switzerland
| | - Sandra Luber
- Department of Chemistry, University of Zürich, Zurich, Switzerland
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Shopov DY, Sharninghausen LS, Sinha SB, Mercado BQ, Balcells D, Brudvig GW, Crabtree RH. A Dinuclear Iridium(V,V) Oxo-Bridged Complex Characterized Using a Bulk Electrolysis Technique for Crystallizing Highly Oxidizing Compounds. Inorg Chem 2018; 57:5684-5691. [DOI: 10.1021/acs.inorgchem.8b00757] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Dimitar Y. Shopov
- Department of Chemistry, Yale University, 225 Prospect Street, New Haven, Connecticut 06520, United States
| | - Liam S. Sharninghausen
- Department of Chemistry, Yale University, 225 Prospect Street, New Haven, Connecticut 06520, United States
| | - Shashi Bhushan Sinha
- Department of Chemistry, Yale University, 225 Prospect Street, New Haven, Connecticut 06520, United States
| | - Brandon Q. Mercado
- Department of Chemistry, Yale University, 225 Prospect Street, New Haven, Connecticut 06520, United States
| | - David Balcells
- Hylleraas Center for Quantum Molecular Sciences, Department of Chemistry, University of Oslo, P.O. Box 1033, Blindern, 0315 Oslo, Norway
| | - Gary W. Brudvig
- Department of Chemistry, Yale University, 225 Prospect Street, New Haven, Connecticut 06520, United States
| | - Robert H. Crabtree
- Department of Chemistry, Yale University, 225 Prospect Street, New Haven, Connecticut 06520, United States
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Sinha SB, Shopov DY, Sharninghausen LS, Stein CJ, Mercado BQ, Balcells D, Pedersen TB, Reiher M, Brudvig GW, Crabtree RH. Redox Activity of Oxo-Bridged Iridium Dimers in an N,O-Donor Environment: Characterization of Remarkably Stable Ir(IV,V) Complexes. J Am Chem Soc 2017. [PMID: 28648068 DOI: 10.1021/jacs.7b04874] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Chemical and electrochemical oxidation or reduction of our recently reported Ir(IV,IV) mono-μ-oxo dimers results in the formation of fully characterized Ir(IV,V) and Ir(III,III) complexes. The Ir(IV,V) dimers are unprecedented and exhibit remarkable stability under ambient conditions. This stability and modest reduction potential of 0.99 V vs NHE is in part attributed to complete charge delocalization across both Ir centers. Trends in crystallographic bond lengths and angles shed light on the structural changes accompanying oxidation and reduction. The similarity of these mono-μ-oxo dimers to our Ir "blue solution" water-oxidation catalyst gives insight into potential reactive intermediates of this structurally elusive catalyst. Additionally, a highly reactive material, proposed to be a Ir(V,V) μ-oxo species, is formed on electrochemical oxidation of the Ir(IV,V) complex in organic solvents at 1.9 V vs NHE. Spectroelectrochemistry shows reversible conversion between the Ir(IV,V) and proposed Ir(V,V) species without any degradation, highlighting the exceptional oxidation resistance of the 2-(2-pyridinyl)-2-propanolate (pyalk) ligand and robustness of these dimers. The Ir(III,III), Ir(IV,IV) and Ir(IV,V) redox states have been computationally studied both with DFT and multiconfigurational calculations. The calculations support the stability of these complexes and provide further insight into their electronic structures.
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Affiliation(s)
- Shashi Bhushan Sinha
- Department of Chemistry, Yale University , 225 Prospect Street, New Haven, Connecticut 06520, United States
| | - Dimitar Y Shopov
- Department of Chemistry, Yale University , 225 Prospect Street, New Haven, Connecticut 06520, United States
| | - Liam S Sharninghausen
- Department of Chemistry, Yale University , 225 Prospect Street, New Haven, Connecticut 06520, United States
| | - Christopher J Stein
- Laboratorium für Physikalische Chemie, ETH Zürich , Vladimir-Prelog Weg 2, 8093 Zürich, Switzerland
| | - Brandon Q Mercado
- Department of Chemistry, Yale University , 225 Prospect Street, New Haven, Connecticut 06520, United States
| | - David Balcells
- Centre for Theoretical and Computational Chemistry (CTCC), Department of Chemistry, University of Oslo , P.O. Box 1033 Blindern, N-0315 Oslo, Norway
| | - Thomas Bondo Pedersen
- Centre for Theoretical and Computational Chemistry (CTCC), Department of Chemistry, University of Oslo , P.O. Box 1033 Blindern, N-0315 Oslo, Norway
| | - Markus Reiher
- Laboratorium für Physikalische Chemie, ETH Zürich , Vladimir-Prelog Weg 2, 8093 Zürich, Switzerland
| | - Gary W Brudvig
- Department of Chemistry, Yale University , 225 Prospect Street, New Haven, Connecticut 06520, United States
| | - Robert H Crabtree
- Department of Chemistry, Yale University , 225 Prospect Street, New Haven, Connecticut 06520, United States
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