1
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Chen JN, Pan ZH, Qiu QH, Wang C, Long LS, Zheng LS, Kong XJ. Soluble Gd 6Cu 24 clusters: effective molecular electrocatalysts for water oxidation. Chem Sci 2024; 15:511-515. [PMID: 38179510 PMCID: PMC10762933 DOI: 10.1039/d3sc05849b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2023] [Accepted: 12/04/2023] [Indexed: 01/06/2024] Open
Abstract
The water oxidation half reaction in water splitting for hydrogen production is extremely rate-limiting. This study reports the synthesis of two heterometallic clusters (Gd6Cu24-IM and Gd6Cu24-AC) for application as efficient water oxidation catalysts. Interestingly, the maximum turnover frequency of Gd6Cu24-IM in an NaAc solution of a weak acid (pH 6) was 319 s-1. The trimetallic catalytic site, H2O-GdIIICuII2-H2O, underwent two consecutive two-electron two-proton coupled transfer processes to form high-valent GdIII-O-O-CuIII2 intermediates. Furthermore, the O-O bond was formed via intramolecular interactions between the CuIII and GdIII centers. The results of this study revealed that synergistic catalytic water oxidation between polymetallic sites can be an effective strategy for regulating O-O bond formation.
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Affiliation(s)
- Jia-Nan Chen
- Collaborative Innovation Center of Chemistry for Energy Materials, State Key Laboratory of Physical Chemistry of Solid Surface, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University Xiamen 361005 China
| | - Zhong-Hua Pan
- Collaborative Innovation Center of Chemistry for Energy Materials, State Key Laboratory of Physical Chemistry of Solid Surface, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University Xiamen 361005 China
| | - Qi-Hao Qiu
- Collaborative Innovation Center of Chemistry for Energy Materials, State Key Laboratory of Physical Chemistry of Solid Surface, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University Xiamen 361005 China
| | - Cheng Wang
- Collaborative Innovation Center of Chemistry for Energy Materials, State Key Laboratory of Physical Chemistry of Solid Surface, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University Xiamen 361005 China
| | - La-Sheng Long
- Collaborative Innovation Center of Chemistry for Energy Materials, State Key Laboratory of Physical Chemistry of Solid Surface, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University Xiamen 361005 China
| | - Lan-Sun Zheng
- Collaborative Innovation Center of Chemistry for Energy Materials, State Key Laboratory of Physical Chemistry of Solid Surface, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University Xiamen 361005 China
| | - Xiang-Jian Kong
- Collaborative Innovation Center of Chemistry for Energy Materials, State Key Laboratory of Physical Chemistry of Solid Surface, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University Xiamen 361005 China
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2
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Balduf T, Blakemore JD, Caricato M. Computational Insights into the Influence of Ligands on Hydrogen Generation with [Cp*Rh] Hydrides. J Phys Chem A 2023. [PMID: 37436832 DOI: 10.1021/acs.jpca.3c02550] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/14/2023]
Abstract
This work reports a computational investigation of the effect of ancillary ligands on the activity of an Rh catalyst for hydrogen evolution based on the [Cp*Rh] motif (Cp* = η5-pentamethylcyclopentadienyl). Specifically, we investigate why a bipyridyl (bpy) ligand leads to H2 generation but diphenylphosphino-based (dpp) ligands do not. We compare the full ligands to simplified models and systematically vary structural features to ascertain their effect on the reaction energy of each catalytic step. The calculations based on density functional theory show that the main effect on reactivity is the choice of linker atom, followed by its coordination. In particular, P stabilizes the intermediate Rh-hydride species by donating electron density to the Rh, thus inhibiting the reaction toward H2 generation. Conversely, N, a more electron-withdrawing center, favors H2 generation at the price of destabilizing the hydride intermediate, which cannot be isolated experimentally and makes determining the mechanism of this reaction more difficult. We also find that the steric effects of bulky substituents on the main ligand scaffold can lead to large effects on the reactivity, which may be challenging to fine-tune. On the other hand, structural features like the bite angle of the bidentate ligand have a much smaller impact on reactivity. Therefore, we propose that the choice of linker atom is key for the catalytic activity of this species, which can be further fine-tuned by a proper choice of electron-directing groups on the ligand scaffold.
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Affiliation(s)
- Ty Balduf
- Department of Chemistry, University of Kansas, 1567 Irving Hill Road, Lawrence, Kansas 66045, United States
| | - James D Blakemore
- Department of Chemistry, University of Kansas, 1567 Irving Hill Road, Lawrence, Kansas 66045, United States
| | - Marco Caricato
- Department of Chemistry, University of Kansas, 1567 Irving Hill Road, Lawrence, Kansas 66045, United States
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3
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Kayanuma M. Theoretical Study of Atom-Transfer Radical Addition Reactions between Perfluoroalkyl Iodides and Styrene Using a Copper Photoredox Catalyst. J Phys Chem A 2023; 127:153-159. [PMID: 36538492 DOI: 10.1021/acs.jpca.2c07519] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
The reaction mechanism of atom-transfer radical addition (ATRA) reactions of perfluoroalkyl iodides with styrene using a Cu(I) photoredox catalyst was analyzed using density functional theory calculations. From among four previously mentioned mechanisms, the ligand-transfer mechanism (ligand abstraction by the radical intermediate) was shown to be most plausible. It was also suggested that the ATRA product would also be reduced by the photoexcited Cu(I) complex.
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Affiliation(s)
- Megumi Kayanuma
- Research Center for Computational Design of Advanced Functional Materials, National Institute of Advanced Industrial Science and Technology, Central 2, 1-1-1 Umezono, Tsukuba, Ibaraki 305-8568, Japan
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4
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Larin EM, Masson-Makdissi J, Jang YJ, Lautens M. Rhodium(I)-Catalyzed Formate-Mediated Domino Heck/1,4-Hydride Addition toward Oxindoles. ACS Catal 2022. [DOI: 10.1021/acscatal.2c04128] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Egor M. Larin
- Davenport Research Laboratories, Department of Chemistry, University of Toronto, Toronto, Ontario M5S 3H6, Canada
| | - Jeanne Masson-Makdissi
- Davenport Research Laboratories, Department of Chemistry, University of Toronto, Toronto, Ontario M5S 3H6, Canada
| | - Young Jin Jang
- Davenport Research Laboratories, Department of Chemistry, University of Toronto, Toronto, Ontario M5S 3H6, Canada
| | - Mark Lautens
- Davenport Research Laboratories, Department of Chemistry, University of Toronto, Toronto, Ontario M5S 3H6, Canada
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5
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Camara F, Gavaggio T, Dautreppe B, Chauvin J, Pécaut J, Aldakov D, Collomb MN, Fortage J. Electrochemical Properties of a Rhodium(III) Mono-Terpyridyl Complex and Use as a Catalyst for Light-Driven Hydrogen Evolution in Water. Molecules 2022; 27:molecules27196614. [PMID: 36235152 PMCID: PMC9571878 DOI: 10.3390/molecules27196614] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2022] [Revised: 09/23/2022] [Accepted: 09/30/2022] [Indexed: 11/16/2022] Open
Abstract
Molecular hydrogen (H2) is considered one of the most promising fuels to decarbonize the industrial and transportation sectors, and its photocatalytic production from molecular catalysts is a research field that is still abounding. The search for new molecular catalysts for H2 production with simple and easily synthesized ligands is still ongoing, and the terpyridine ligand with its particular electronic and coordination properties, is a good candidate to design new catalysts meeting these requirements. Herein, we have isolated the new mono-terpyridyl rhodium complex, [RhIII(tpy)(CH3CN)Cl2](CF3SO3) (Rh-tpy), and shown that it can act as a catalyst for the light-induced proton reduction into H2 in water in the presence of the [Ru(bpy)3]Cl2 (Ru) photosensitizer and ascorbate as sacrificial electron donor. Under photocatalytic conditions, in acetate buffer at pH 4.5 with 0.1 M of ascorbate and 530 μM of Ru, the Rh-tpy catalyst produces H2 with turnover number versus catalyst (TONCat*) of 300 at a Rh concentration of 10 μM, and up to 1000 at a concentration of 1 μM. The photocatalytic performance of Ru/Rh-tpy/HA-/H2A has been also compared with that obtained with the bis-dimethyl-bipyridyl complex [RhIII(dmbpy)2Cl2]+ (Rh2) as a catalyst in the same experimental conditions. The investigation of the electrochemical properties of Rh-tpy in DMF solvent reveals that the two-electrons reduced state of the complex, the square-planar [RhI(tpy)Cl] (RhI-tpy), is quantitatively electrogenerated by bulk electrolysis. This complex is stable for hours under an inert atmosphere owing to the π-acceptor property of the terpyridine ligand that stabilizes the low oxidation states of the rhodium, making this catalyst less prone to degrade during photocatalysis. The π-acceptor property of terpyridine also confers to the Rh-tpy catalyst a moderately negative reduction potential (Epc(RhIII/RhI) = -0.83 V vs. SCE in DMF), making possible its reduction by the reduced state of Ru, [RuII(bpy)(bpy•-)]+ (Ru-) (E1/2(RuII/Ru-) = -1.50 V vs. SCE) generated by a reductive quenching of the Ru excited state (*Ru) by ascorbate during photocatalysis. A Stern-Volmer plot and transient absorption spectroscopy confirmed that the first step of the photocatalytic process is the reductive quenching of *Ru by ascorbate. The resulting reduced Ru species (Ru-) were then able to activate the RhIII-tpy H2-evolving catalyst by reduction generating RhI-tpy, which can react with a proton on a sub-nanosecond time scale to form a RhIII(H)-tpy hydride, the key intermediate for H2 evolution.
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Affiliation(s)
- Fakourou Camara
- DCM, CNRS, Université Grenoble Alpes, 38000 Grenoble, France
- SyMMES, IRIG, CEA, CNRS, Université Grenoble Alpes, 38000 Grenoble, France
| | - Thomas Gavaggio
- DCM, CNRS, Université Grenoble Alpes, 38000 Grenoble, France
| | | | - Jérôme Chauvin
- DCM, CNRS, Université Grenoble Alpes, 38000 Grenoble, France
| | - Jacques Pécaut
- SyMMES, IRIG, CEA, CNRS, Université Grenoble Alpes, 38000 Grenoble, France
| | - Dmitry Aldakov
- SyMMES, IRIG, CEA, CNRS, Université Grenoble Alpes, 38000 Grenoble, France
| | - Marie-Noëlle Collomb
- DCM, CNRS, Université Grenoble Alpes, 38000 Grenoble, France
- Correspondence: (M.-N.C.); (J.F.)
| | - Jérôme Fortage
- DCM, CNRS, Université Grenoble Alpes, 38000 Grenoble, France
- Correspondence: (M.-N.C.); (J.F.)
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6
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Jiang B, Gil‐Sepulcre M, Garrido‐Barros P, Gimbert‐Suriñach C, Wang J, Garcia‐Anton J, Nolis P, Benet‐Buchholz J, Romero N, Sala X, Llobet A. Unravelling the Mechanistic Pathway of the Hydrogen Evolution Reaction Driven by a Cobalt Catalyst. Angew Chem Int Ed Engl 2022; 61:e202209075. [PMID: 35922381 PMCID: PMC9804897 DOI: 10.1002/anie.202209075] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2022] [Indexed: 01/09/2023]
Abstract
A cobalt complex bearing a κ-N3 P2 ligand is presented (1+ or CoI (L), where L is (1E,1'E)-1,1'-(pyridine-2,6-diyl)bis(N-(3-(diphenylphosphanyl)propyl)ethan-1-imine). Complex 1+ is stable under air at oxidation state CoI thanks to the π-acceptor character of the phosphine groups. Electrochemical behavior of 1+ reveals a two-electron CoI /CoIII oxidation process and an additional one-electron reduction, which leads to an enhancement in the current due to hydrogen evolution reaction (HER) at Eonset =-1.6 V vs Fc/Fc+ . In the presence of 1 equiv of bis(trifluoromethane)sulfonimide, 1+ forms the cobalt hydride derivative CoIII (L)-H (22+ ), which has been fully characterized. Further addition of 1 equiv of CoCp*2 (Cp* is pentamethylcyclopentadienyl) affords the reduced CoII (L)-H (2+ ) species, which rapidly forms hydrogen and regenerates the initial CoI (L) (1+ ). The spectroscopic characterization of catalytic intermediates together with DFT calculations support an unusual bimolecular homolytic mechanism in the catalytic HER with 1+ .
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Affiliation(s)
- Bing Jiang
- Departament de QuímicaUniversitat Autònoma de Barcelona Cerdanyola del Valles08193BarcelonaSpain
| | - Marcos Gil‐Sepulcre
- Institute of Chemical Research of Catalonia (ICIQ)Barcelona Institute of Science and Technology (BIST)Av. Països Catalans 1643007TarragonaSpain
| | - Pablo Garrido‐Barros
- Institute of Chemical Research of Catalonia (ICIQ)Barcelona Institute of Science and Technology (BIST)Av. Països Catalans 1643007TarragonaSpain
| | - Carolina Gimbert‐Suriñach
- Departament de QuímicaUniversitat Autònoma de Barcelona Cerdanyola del Valles08193BarcelonaSpain,Institute of Chemical Research of Catalonia (ICIQ)Barcelona Institute of Science and Technology (BIST)Av. Països Catalans 1643007TarragonaSpain
| | - Jia‐Wei Wang
- Institute of Chemical Research of Catalonia (ICIQ)Barcelona Institute of Science and Technology (BIST)Av. Països Catalans 1643007TarragonaSpain
| | - Jordi Garcia‐Anton
- Departament de QuímicaUniversitat Autònoma de Barcelona Cerdanyola del Valles08193BarcelonaSpain
| | - Pau Nolis
- Servei de Ressonància Magnètica NuclearUniversitat Autònoma de Barcelona08193 BellaterraBarcelonaCataloniaSpain
| | - Jordi Benet‐Buchholz
- Institute of Chemical Research of Catalonia (ICIQ)Barcelona Institute of Science and Technology (BIST)Av. Països Catalans 1643007TarragonaSpain
| | - Nuria Romero
- Departament de QuímicaUniversitat Autònoma de Barcelona Cerdanyola del Valles08193BarcelonaSpain,Laboratoire de Chimie de Coordination (LCC)—UPR 8241205 Route de Narbonne, BP4409931077Toulouse Cedex 4France
| | - Xavier Sala
- Departament de QuímicaUniversitat Autònoma de Barcelona Cerdanyola del Valles08193BarcelonaSpain
| | - Antoni Llobet
- Departament de QuímicaUniversitat Autònoma de Barcelona Cerdanyola del Valles08193BarcelonaSpain,Institute of Chemical Research of Catalonia (ICIQ)Barcelona Institute of Science and Technology (BIST)Av. Països Catalans 1643007TarragonaSpain
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7
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Generation and characterization of hydrides of bipyridyl-iridium(III) complexes for photocatalysis. J Electroanal Chem (Lausanne) 2022. [DOI: 10.1016/j.jelechem.2022.116770] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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8
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Jiang B, Gil-Sepulcre M, Garrido-Barros P, Gimbert-Suriñach C, Wang JW, Garcia-Anton J, Nolis P, Benet-Buchholz J, Romero N, Sala X, Llobet A. Unravelling the Mechanistic Pathway of the Hydrogen Evolution Reaction Driven by a Cobalt Catalyst. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202209075] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Bing Jiang
- Autonomous University of Barcelona: Universitat Autonoma de Barcelona Chemistry SPAIN
| | | | | | | | - Jia-Wei Wang
- ICIQ: Institut Catala d'Investigacio Quimica ICIQ SPAIN
| | - Jordi Garcia-Anton
- Autonomous University of Barcelona: Universitat Autonoma de Barcelona Chemistry SPAIN
| | - Pau Nolis
- Autonomous University of Barcelona: Universitat Autonoma de Barcelona Chemistry SPAIN
| | | | - Nuria Romero
- LCC: Laboratoire de Chimie de Coordination LCC SPAIN
| | - Xavier Sala
- Universitat Autonoma de Barcelona Chemistry Campus BellaterraFacultat de CiènciesEdifici C 08193 Cerdanyola del Vallès SPAIN
| | - Antoni Llobet
- ICIQ: Institut Catala d'Investigacio Quimica ICIQ SPAIN
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9
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Comadoll CG, Henke WC, Hopkins Leseberg JA, Douglas JT, Oliver AG, Day VW, Blakemore JD. Examining the Modular Synthesis of [Cp*Rh] Monohydrides Supported by Chelating Diphosphine Ligands. Organometallics 2021. [DOI: 10.1021/acs.organomet.1c00525] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Chelsea G. Comadoll
- Department of Chemistry, University of Kansas, 1567 Irving Hill Road, Lawrence, Kansas 66045, United States
| | - Wade C. Henke
- Department of Chemistry, University of Kansas, 1567 Irving Hill Road, Lawrence, Kansas 66045, United States
| | - Julie A. Hopkins Leseberg
- Department of Chemistry, University of Kansas, 1567 Irving Hill Road, Lawrence, Kansas 66045, United States
| | - Justin T. Douglas
- Nuclear Magnetic Resonance Laboratory, Molecular Structures Group, University of Kansas, 2034 Becker Drive, Lawrence, Kansas 66047, United States
| | - Allen G. Oliver
- Department of Chemistry and Biochemistry, University of Notre Dame, 149 Stepan Chemistry, Notre Dame, Indiana 46556, United States
| | - Victor W. Day
- Department of Chemistry, University of Kansas, 1567 Irving Hill Road, Lawrence, Kansas 66045, United States
| | - James D. Blakemore
- Department of Chemistry, University of Kansas, 1567 Irving Hill Road, Lawrence, Kansas 66045, United States
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10
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Wolff N, Rivada‐Wheelaghan O, Tocqueville D. Molecular Electrocatalytic Hydrogenation of Carbonyls and Dehydrogenation of Alcohols. ChemElectroChem 2021. [DOI: 10.1002/celc.202100617] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Niklas Wolff
- Laboratoire d'Électrochimie Moléculaire Université de Paris, CNRS F-75006 Paris France
| | | | - Damien Tocqueville
- Laboratoire d'Électrochimie Moléculaire Université de Paris, CNRS F-75006 Paris France
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11
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Rennie BE, Eleftheriades RG, Morris RH. Systematic Trends in the Electrochemical Properties of Transition Metal Hydride Complexes Discovered by Using the Ligand Acidity Constant Equation. J Am Chem Soc 2020; 142:17607-17629. [PMID: 32941024 DOI: 10.1021/jacs.0c08000] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Understanding the thermodynamics of paramagnetic transition metal hydride complexes, especially of the abundant 3d metals, is important in the design of electrocatalysts and organometallic catalysts. The pKaMeCN([MHLn]+/[MLn) of paramagnetic hydrides in MeCN are estimated for the first time using the ligand acidity constant (LAC) equation where contributions to the pKaMeCN from each ligand are simply added together, with the sum corrected for effects of charge and 5d metals. The pKaLAC-MeCN([MHLn]+/MLn) of over 200 hydride complexes MHLn are used, along with their electrochemical potentials from the literature, in an uncommonly applied thermochemical cycle in order to reveal systematic trends in the redox couples MIII/II and MV/IV (M = Cr, Mo, W), MnII/I, ReVI/V and ReIV/III, MIII/II and MIV/III (M = Fe, Ru, Os), and MIII/II and MII/I (M = Co, Rh, and Ir) and allow the estimation of the bond dissociation free energies BDFE(MH) of the unoxidized hydrides MHLn and the prediction of the electrochemical potential for their oxidation. Density functional theory (DFT) calculations are used to validate the pKaLAC-MeCN values of hydrides of WIII, MnII, FeIII, RuIII, CoII, and NiIII. When a pKaLAC-MeCN is less than zero for a given complex [MHLn]+, the oxidation of MHLn is irreversible due to proton loss from the oxidized complex to the solvent. When pKaLAC-MeCN ≫ 0, the oxidation is reversible when there is no gross change in the coordination geometry upon a change in the redox state. Twenty paramagnetic hydrides prepared in bulk all have pKaLAC-MeCN > 8.
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Affiliation(s)
- Benjamin E Rennie
- Department of Chemistry, University of Toronto, 80 Saint George St., Toronto, Ontario M5S3H6, Canada
| | - Renée G Eleftheriades
- Department of Chemistry, University of Toronto, 80 Saint George St., Toronto, Ontario M5S3H6, Canada
| | - Robert H Morris
- Department of Chemistry, University of Toronto, 80 Saint George St., Toronto, Ontario M5S3H6, Canada
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12
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Bani-Yaseen AD, Elbashier E. Computational Insights on the Electrocatalytic Behavior of [Cp*Rh] Molecular Catalysts Immobilized on Graphene for Heterogeneous Hydrogen Evolution Reaction. Sci Rep 2020; 10:5777. [PMID: 32238849 PMCID: PMC7113254 DOI: 10.1038/s41598-020-62758-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2020] [Accepted: 03/13/2020] [Indexed: 12/03/2022] Open
Abstract
The heterogeneous metal-based molecular electrocatalyst can typically exhibit attractive features compared to its homogeneous analogue including recoverability and durability. As such, it is necessary to evaluate the electrocatalytic behavior of heterogenized molecular catalysts of interest toward gaining insights concerning the retainability of such behaviors while benefiting from heterogenization. In this work, we examined computationally the electrochemical properties of nanographene-based heterogenized molecular complexes of Rhodium. We assessed, as well, the electrocatalytic behavior of the heterogenized molecular catalyst for hydrogen evolution reaction (HER). Two electrochemical pathways were examined, namely one- and two-electron electrochemical reduction pathways. Interestingly, it is computationally demonstrated that [RhIII(Cp*)(phen)Cl]+-Gr can exhibit redox and electrocatalytic properties for HER that are comparable to its homogeneous analogue via a two-electron reduction pathway. On the other hand, the one-electron reduction pathway is notably found to be less favorable kinetically and thermodynamically. Furthermore, molecular insights are provided with respect to the HER employing molecular orbitals analyses and mechanistic aspects. Importantly, our findings may provide insights toward designing more efficient graphene-based molecular heterogeneous electrocatalysts for more efficient energy production.
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Affiliation(s)
- Abdulilah Dawoud Bani-Yaseen
- Department of Chemistry & Earth Sciences, College of Arts & Science, Qatar University, P.O. Box 2713, Doha, State of Qatar.
| | - Elkhansa Elbashier
- Department of Chemistry & Earth Sciences, College of Arts & Science, Qatar University, P.O. Box 2713, Doha, State of Qatar
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13
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Gueret R, Castillo CE, Rebarz M, Thomas F, Sliwa M, Chauvin J, Dautreppe B, Pécaut J, Fortage J, Collomb MN. Cobalt(II) Pentaaza-Macrocyclic Schiff Base Complex as Catalyst for Light-Driven Hydrogen Evolution in Water: Electrochemical Generation and Theoretical Investigation of the One-Electron Reduced Species. Inorg Chem 2019; 58:9043-9056. [DOI: 10.1021/acs.inorgchem.9b00447] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Robin Gueret
- Univ. Grenoble Alpes, CNRS, DCM, 38000 Grenoble, France
| | | | - Mateusz Rebarz
- Université de Lille, CNRS, UMR 8516, LASIR, Laboratoire de Spectrochimie Infrarouge et Raman, F59 000 Lille, France
| | | | - Michel Sliwa
- Université de Lille, CNRS, UMR 8516, LASIR, Laboratoire de Spectrochimie Infrarouge et Raman, F59 000 Lille, France
| | | | - Baptiste Dautreppe
- Univ. Grenoble Alpes, CNRS, DCM, 38000 Grenoble, France
- Univ. Grenoble Alpes, CEA, CNRS, IRI, SYMMES 38000 Grenoble, France
| | - Jacques Pécaut
- Univ. Grenoble Alpes, CEA, CNRS, IRI, SYMMES 38000 Grenoble, France
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14
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Boyd EA, Lionetti D, Henke WC, Day VW, Blakemore JD. Preparation, Characterization, and Electrochemical Activation of a Model [Cp*Rh] Hydride. Inorg Chem 2019; 58:3606-3615. [PMID: 30256096 DOI: 10.1021/acs.inorgchem.8b02160] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Monomeric half-sandwich rhodium hydride complexes are often proposed as intermediates in catalytic cycles, but relatively few such compounds have been isolated and studied, limiting understanding of their properties. Here, we report preparation and isolation of a monomeric rhodium(III) hydride complex bearing the pentamethylcyclopentadienyl (Cp*) and bis(diphenylphosphino)benzene (dppb) ligands. The hydride complex is formed rapidly upon addition of weak acid to a reduced precursor complex, Cp*Rh(dppb). Single-crystal X-ray diffraction data for the [Cp*Rh] hydride, which were previously unavailable for this class of compounds, provide evidence of the direct Rh-H interaction. Complementary infrared spectra show the Rh-H stretching frequency at 1986 cm-1. In contrast to results with other [Cp*Rh] complexes bearing diimine ligands, treatment of the isolated hydride with strong acid does not result in H2 evolution. Electrochemical studies reveal that the hydride complex can be reduced only at very negative potentials (ca. -2.5 V vs ferrocenium/ferrocene), resulting in Rh-H bond cleavage and H2 generation. These results are discussed in the context of catalytic H2 generation, and development of design rules for improved catalysts bearing the [Cp*] ligand.
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Affiliation(s)
- Emily A Boyd
- Department of Chemistry , University of Kansas , 1251 Wescoe Hall Drive , Lawrence , Kansas 66045 , United States
| | - Davide Lionetti
- Department of Chemistry , University of Kansas , 1251 Wescoe Hall Drive , Lawrence , Kansas 66045 , United States
| | - Wade C Henke
- Department of Chemistry , University of Kansas , 1251 Wescoe Hall Drive , Lawrence , Kansas 66045 , United States
| | - Victor W Day
- Department of Chemistry , University of Kansas , 1251 Wescoe Hall Drive , Lawrence , Kansas 66045 , United States
| | - James D Blakemore
- Department of Chemistry , University of Kansas , 1251 Wescoe Hall Drive , Lawrence , Kansas 66045 , United States
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