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Kumar P, Tyagi VP, Ghosh M. Exploring the Multifarious Role of the Ligand in Electrocatalytic Hydrogen Evolution Reaction Pathways. Chemistry 2023; 29:e202302195. [PMID: 37728113 DOI: 10.1002/chem.202302195] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2023] [Revised: 09/18/2023] [Accepted: 09/18/2023] [Indexed: 09/21/2023]
Abstract
In recent years, researchers have shifted their focus towards investigating the redox properties of ancillary ligand backbones for small-molecule activation. Several metal complexes have been reported for the electrocatalytic H2 evolution reaction (HER), providing valuable mechanistic insights. This process involves efficient coupling of electrons and protons. Redox-active ligands stipulate internal electron transfer and promote effective orbital overlap between metal and ligand, thereby, enabling efficient proton-coupled electron transfer reactions. Understanding such catalytic mechanisms requires thorough spectroscopic and computational analyses. Herein, we summarize recent examples of molecular electrocatalysts based on 3d transition metals that have significantly influenced mechanistic pathways, thus, emphasizing the multifaceted role of metal-ligand cooperativity.
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Affiliation(s)
- Pankaj Kumar
- Department of Chemistry, Ashoka University, Plot #2, Rajiv Gandhi Education City, National Capital Region, 131029, Sonipat, Haryana, India
| | - Vyom Prakash Tyagi
- Department of Chemistry, Ashoka University, Plot #2, Rajiv Gandhi Education City, National Capital Region, 131029, Sonipat, Haryana, India
| | - Munmun Ghosh
- Department of Chemistry, Ashoka University, Plot #2, Rajiv Gandhi Education City, National Capital Region, 131029, Sonipat, Haryana, India
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2
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Teindl K, Patrick BO, Nichols EM. Linear Free Energy Relationships and Transition State Analysis of CO 2 Reduction Catalysts Bearing Second Coordination Spheres with Tunable Acidity. J Am Chem Soc 2023; 145:17176-17186. [PMID: 37499125 DOI: 10.1021/jacs.3c03919] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/29/2023]
Abstract
In molecular catalysts, protic functional groups in the secondary coordination sphere (SCS) work in conjunction with an exogenous acid to relay protons to the active site of electrochemical CO2 reduction; however, it is not well understood how the acidity of the SCS and exogenous acid together determine the kinetics of catalytic turnover. To evaluate the relative contributions of proton transfer driving forces, we synthesized a series of modular iron tetraphenylporphyrin electrocatalysts bearing SCS amides of tunable pKa (17.6 to 20.0 in dimethyl sulfoxide (DMSO)) and employed phenols of variable acidity (15.3 to 19.1) as exogenous acids. This system allowed us to (1) evaluate contributions from proton transfer driving forces associated with either the SCS or exogenous acid and (2) obtain mechanistic insights into CO2 reduction as a function of pKa. A series of linear free-energy relationships show that kinetics become increasingly sensitive to variations in SCS pKa when more acidic exogenous acids are used (0.82 ≥ Brønsted α ≥ 0.13), as well as to variations in exogenous acid pKa when SCS acidity is increased (0.62 ≥ Brønsted α ≥ 0.32). An Eyring analysis suggests that the rate-determining transition state becomes more ordered with decreasing SCS acidity, which is consistent with the proposal that SCS acidity modulates charge accumulation and solvation at the rate-limiting transition state. Together, these insights enable the optimization of activation barriers as a function of both SCS and exogenous acid pKa and can further guide the rational design of electrocatalytic systems wherein contributions from all participants in a proton relay are considered.
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Affiliation(s)
- Kaeden Teindl
- Department of Chemistry, The University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
| | - Brian O Patrick
- Department of Chemistry, The University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
| | - Eva M Nichols
- Department of Chemistry, The University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
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3
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McCool JD, Zhang S, Cheng I, Zhao X. Rational development of molecular earth-abundant metal complexes for electrocatalytic hydrogen production. CHINESE JOURNAL OF CATALYSIS 2022. [DOI: 10.1016/s1872-2067(22)64150-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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4
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Abstract
We report an intermolecular Ni-catalyzed reductive coupling of aryl iodides and isatins to form 3-hydroxyoxindoles. In contrast to common metal-mediated methods, sec-butanol is used as a mild stoichiometric reductant resulting in benign waste products. This formal 1,2-addition reaction is facilitated by a 1,5-diaza-3,7-diphosphacyclooctane (P2N2) ligand. Two Ni(0)-P2N2 species are prepared and found to be catalytically active, supporting a mechanistic hypothesis that this reaction proceeds by a modified carbonyl-Heck-type pathway.
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Affiliation(s)
- Amrah Nasim
- Centre for Catalysis Research and Innovation, Department of Chemistry and Biomolecular Sciences, University of Ottawa, 10 Marie Curie, Ottawa, Ontario K1N 6N5, Canada
| | - Gilian T Thomas
- Centre for Catalysis Research and Innovation, Department of Chemistry and Biomolecular Sciences, University of Ottawa, 10 Marie Curie, Ottawa, Ontario K1N 6N5, Canada
| | - Jeffrey S Ovens
- Centre for Catalysis Research and Innovation, Department of Chemistry and Biomolecular Sciences, University of Ottawa, 10 Marie Curie, Ottawa, Ontario K1N 6N5, Canada
| | - Stephen G Newman
- Centre for Catalysis Research and Innovation, Department of Chemistry and Biomolecular Sciences, University of Ottawa, 10 Marie Curie, Ottawa, Ontario K1N 6N5, Canada
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5
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Wiedner ES, Appel AM, Raugei S, Shaw WJ, Bullock RM. Molecular Catalysts with Diphosphine Ligands Containing Pendant Amines. Chem Rev 2022; 122:12427-12474. [PMID: 35640056 DOI: 10.1021/acs.chemrev.1c01001] [Citation(s) in RCA: 33] [Impact Index Per Article: 16.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Pendant amines play an invaluable role in chemical reactivity, especially for molecular catalysts based on earth-abundant metals. As inspired by [FeFe]-hydrogenases, which contain a pendant amine positioned for cooperative bifunctionality, synthetic catalysts have been developed to emulate this multifunctionality through incorporation of a pendant amine in the second coordination sphere. Cyclic diphosphine ligands containing two amines serve as the basis for a class of catalysts that have been extensively studied and used to demonstrate the impact of a pendant base. These 1,5-diaza-3,7-diphosphacyclooctanes, now often referred to as "P2N2" ligands, have profound effects on the reactivity of many catalysts. The resulting [Ni(PR2NR'2)2]2+ complexes are electrocatalysts for both the oxidation and production of H2. Achieving the optimal benefit of the pendant amine requires that it has suitable basicity and is properly positioned relative to the metal center. In addition to the catalytic efficacy demonstrated with [Ni(PR2NR'2)2]2+ complexes for the oxidation and production of H2, catalysts with diphosphine ligands containing pendant amines have also been demonstrated for several metals for many different reactions, both in solution and immobilized on surfaces. The impact of pendant amines in catalyst design continues to expand.
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6
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Nocera DG. Proton-Coupled Electron Transfer: The Engine of Energy Conversion and Storage. J Am Chem Soc 2022; 144:1069-1081. [PMID: 35023740 DOI: 10.1021/jacs.1c10444] [Citation(s) in RCA: 52] [Impact Index Per Article: 26.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Proton-coupled electron transfer (PCET) underpins energy conversion in chemistry and biology. Four energy systems are described whose discoveries are based on PCET: the water splitting chemistry of the Artificial Leaf, the carbon fixation chemistry of the Bionic Leaf-C, the nitrogen fixation chemistry of the Bionic Leaf-N and the Coordination Chemistry Flow Battery (CCFB). Whereas the Artificial Leaf, Bionic Leaf-C, and Bionic Leaf-N require strong coupling between electron and proton to reduce energetic barriers to enable high energy efficiencies, the CCFB requires complete decoupling of the electron and proton so as to avoid parasitic energy-wasting reactions. The proper design of PCET in these systems facilitates their implementation in the areas of (i) centralized large scale grid storage of electricity and (ii) decentralized energy storage/conversion using only sunlight, air and any water source to produce fuel and food within a sustainable cycle for the biogenic elements of C, N and P.
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Affiliation(s)
- Daniel G Nocera
- Department of Chemistry and Chemical Biology, Harvard University, 12 Oxford Street, Cambridge, Massachusetts 02138, United States
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7
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Sánchez P, Goel B, Neugebauer H, Lalancette RA, Grimme S, Hansen A, Prokopchuk DE. Ligand Protonation at Carbon, not Nitrogen, during H 2 Production with Amine-Rich Iron Electrocatalysts. Inorg Chem 2021; 60:17407-17413. [PMID: 34735115 DOI: 10.1021/acs.inorgchem.1c03142] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
We present monometallic H2 production electrocatalysts containing electron-rich triamine-cyclopentadienyl (Cp) ligands coordinated to iron. After selective CO extrusion from the iron tricarbonyl precursors, electrocatalysis is observed via cyclic voltammetry in the presence of an exogenous acid. Contrary to the fact that amines in the secondary coordination sphere are often protonated during electrocatalysis, comprehensive quantum-chemical calculations indicate that the amines likely do not function as proton relays; instead, endo-Cp ring protonation is most favorable after 1e- reduction. This unusual mechanistic pathway emphasizes the need to consider a broad domain of H+/e- addition products by synergistically combining experimental and theoretical resources.
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Affiliation(s)
- Práxedes Sánchez
- Department of Chemistry, Rutgers University─Newark, 73 Warren Street, Newark, New Jersey 07102, United States
| | - Bhumika Goel
- Department of Chemistry, Rutgers University─Newark, 73 Warren Street, Newark, New Jersey 07102, United States
| | - Hagen Neugebauer
- Mulliken Center for Theoretical Chemistry, Institut für Physikalische und Theoretische Chemie, Rheinische Friedrich-Wilhelms Universität Bonn, Beringstraße 4, Bonn 53115, Germany
| | - Roger A Lalancette
- Department of Chemistry, Rutgers University─Newark, 73 Warren Street, Newark, New Jersey 07102, United States
| | - Stefan Grimme
- Mulliken Center for Theoretical Chemistry, Institut für Physikalische und Theoretische Chemie, Rheinische Friedrich-Wilhelms Universität Bonn, Beringstraße 4, Bonn 53115, Germany
| | - Andreas Hansen
- Mulliken Center for Theoretical Chemistry, Institut für Physikalische und Theoretische Chemie, Rheinische Friedrich-Wilhelms Universität Bonn, Beringstraße 4, Bonn 53115, Germany
| | - Demyan E Prokopchuk
- Department of Chemistry, Rutgers University─Newark, 73 Warren Street, Newark, New Jersey 07102, United States
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8
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Laureanti JA, Su Q, Shaw WJ. A protein scaffold enables hydrogen evolution for a Ni-bisdiphosphine complex. Dalton Trans 2021; 50:15754-15759. [PMID: 34704584 DOI: 10.1039/d1dt03295j] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
An artificial metalloenzyme acting as a functional biomimic of hydrogenase enzymes was activated by assembly via covalent attachment of the molecular complex, [Ni(PNglycineP)2]2-, within a structured protein scaffold. Electrocatalytic H2 production was observed from pH 3.0 to 10.0 for the artificial enzyme, while no electrocatalytic activity was observed for similar [Ni(PNP)2]2+ systems.
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Affiliation(s)
- Joseph A Laureanti
- Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, WA 99352, USA.
| | - Qiwen Su
- Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, WA 99352, USA.
| | - Wendy J Shaw
- Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, WA 99352, USA.
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9
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Kireev NV, Kiryutin AS, Pavlov AA, Yurkovskaya AV, Musina EI, Karasik AA, Shubina ES, Ivanov KL, Belkova NV. Nickel(II) Dihydrogen and Hydride Complexes as the Intermediates of H
2
Heterolytic Splitting by Nickel Diazadiphosphacyclooctane Complexes. Eur J Inorg Chem 2021. [DOI: 10.1002/ejic.202100489] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Nikolay V. Kireev
- A. N. Nesmeyanov Institute of Organoelement Compounds Russian Academy of Sciences Vavilov Street 28 119991 Moscow Russia
| | - Alexey S. Kiryutin
- International Tomography Center Novosibirsk State University Pirogova street 1 Novosibirsk 630090 Russia
| | - Alexander A. Pavlov
- A. N. Nesmeyanov Institute of Organoelement Compounds Russian Academy of Sciences Vavilov Street 28 119991 Moscow Russia
| | - Alexandra V. Yurkovskaya
- International Tomography Center Novosibirsk State University Pirogova street 1 Novosibirsk 630090 Russia
| | - Elvira I. Musina
- A. E. Arbuzov Institute of Organic and Physical Chemistry Kazan Scientific Center Russian Academy of Sciences Arbuzov str. 8 420088 Kazan Russia
| | - Andrey A. Karasik
- A. E. Arbuzov Institute of Organic and Physical Chemistry Kazan Scientific Center Russian Academy of Sciences Arbuzov str. 8 420088 Kazan Russia
| | - Elena S. Shubina
- A. N. Nesmeyanov Institute of Organoelement Compounds Russian Academy of Sciences Vavilov Street 28 119991 Moscow Russia
| | - Konstantin L. Ivanov
- International Tomography Center Novosibirsk State University Pirogova street 1 Novosibirsk 630090 Russia
| | - Natalia V. Belkova
- A. N. Nesmeyanov Institute of Organoelement Compounds Russian Academy of Sciences Vavilov Street 28 119991 Moscow Russia
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10
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Wang VCC. Beyond the Active Site: Mechanistic Investigations of the Role of the Secondary Coordination Sphere and Beyond in Multi-electron Electrocatalytic Reactions. ACS Catal 2021. [DOI: 10.1021/acscatal.0c04770] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Vincent C.-C. Wang
- Department of Chemistry, National Sun Yat-sen University, Kaohsiung, 80424, Taiwan, Republic of China
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11
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Roubelakis MM, Bediako DK, Dogutan DK, Nocera DG. Influence of the proton relay spacer on hydrogen electrocatalysis by cobalt hangman porphyrins. J PORPHYR PHTHALOCYA 2021. [DOI: 10.1142/s108842462150067x] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
A cobalt hangman porphyrin system with a phenyl spacer between the porphyrin ring and an internal carboxylic acid group as well as its non-hangman analogue were synthesized and utilized for the study of the proton-coupled electron transfer (PCET) kinetics attendant to electrocatalytic hydrogen evolution. Cyclic voltammetry (CV) together with simulations show that a short distance between the proton relay and the redox active cobalt center as well as the increased proton donating strength results in superior catalytic activity. The mechanism of hydrogen generation is at the nexus of proton transfer–electron transfer (PTET) and concerted proton–electron transfer (CPET), as opposed to an ETPT mechanism that is characteristic of hangman systems with longer proton relay networks.
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Affiliation(s)
- Manolis M. Roubelakis
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, MA 02138, USA
| | - D. Kwabena Bediako
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, MA 02138, USA
- Department of Chemistry, University of California, Berkeley, California 94720, USA
| | - Dilek K. Dogutan
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, MA 02138, USA
| | - Daniel G. Nocera
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, MA 02138, USA
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12
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Margarit CG, Asimow NG, Thorarinsdottir AE, Costentin C, Nocera DG. Impactful Role of Cocatalysts on Molecular Electrocatalytic Hydrogen Production. ACS Catal 2021. [DOI: 10.1021/acscatal.1c00253] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Charles G. Margarit
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, United States
| | - Naomi G. Asimow
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, United States
| | - Agnes E. Thorarinsdottir
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, United States
| | - Cyrille Costentin
- Département de Chimie Moléculaire, Université Grenoble-Alpes, CNRS, UMR 5250, 38000 Grenoble, France
- Université de Paris, 75013 Paris, France
| | - Daniel G. Nocera
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, United States
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13
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Fantuzzi F, Nascimento MAC, Ginovska B, Bullock RM, Raugei S. Splitting of multiple hydrogen molecules by bioinspired diniobium metal complexes: a DFT study. Dalton Trans 2021; 50:840-849. [PMID: 33237062 DOI: 10.1039/d0dt03411h] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Splitting of molecular hydrogen (H2) into bridging and terminal hydrides is a common step in transition metal chemistry. Herein, we propose a novel organometallic platform for cleavage of multiple H2 molecules, which combines metal centers capable of stabilizing multiple oxidation states, and ligands bearing positioned pendant basic groups. Using quantum chemical modeling, we show that low-valent, early transition metal diniobium(ii) complexes with diphosphine ligands featuring pendant amines can favorably uptake up to 8 hydrogen atoms, and that the energetics are favored by the formation of intramolecular dihydrogen bonds. This result suggests new possible strategies for the development of hydrogen scavenger molecules that are able to perform reversible splitting of multiple H2 molecules.
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Affiliation(s)
- Felipe Fantuzzi
- Instituto de Química, Universidade Federal do Rio de Janeiro, Av. Athos da Silveira Ramos 149, 21941.909, Rio de Janeiro, Brazil.
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14
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Abstract
Two complementary rational synthetic routes have been developed in order to synthesize hangman chlorins, which differ with regard to the order of the installation (pre- and post-formation of the chlorin macrocycle) and position of the xanthene backbone about the chlorin periphery. The versatility of the synthetic method is demonstrated with the preparation of ten new hangman chlorins bearing a xanthene backbone and a pendant carboxylic acid. Cyclic voltammograms of hangman chlorins exhibit a hangman effect derived from intermolecular proton transfer. This hangman effect is manifested in catalytic hydrogen evolution production.
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Affiliation(s)
- Mengran Liu
- Department of Chemistry and Chemical Biology, Harvard University, 12 Oxford Street, Cambridge, Massachusetts 02138, United States
| | - Dilek K Dogutan
- Department of Chemistry and Chemical Biology, Harvard University, 12 Oxford Street, Cambridge, Massachusetts 02138, United States
| | - Daniel G Nocera
- Department of Chemistry and Chemical Biology, Harvard University, 12 Oxford Street, Cambridge, Massachusetts 02138, United States
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15
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Margarit CG, Asimow NG, Gonzalez MI, Nocera DG. Double Hangman Iron Porphyrin and the Effect of Electrostatic Nonbonding Interactions on Carbon Dioxide Reduction. J Phys Chem Lett 2020; 11:1890-1895. [PMID: 32022566 DOI: 10.1021/acs.jpclett.9b03897] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Hangman porphyrins influence the reaction rates of small molecule activation by positioning a functional group in the secondary coordination sphere of the metal center. Electrocatalysis by hangman porphyrins has examined only one face modification of the macrocycle with a hanging group, thus allowing for circumvention of secondary sphere effects by reaction of the small molecule on the opposite face of the hangman cleft. We now report the synthesis and characterization of a double hangman Fe porphyrin in which both faces of the macrocycle are modified with a hanging group. With this double hangman architecture, we are able to unequivocally examine the role of electrostatic interactions on the carbon dioxide reduction reaction (CO2RR) and show that CO2RR rates are significantly attenuated, consistent with the initial reduction of CO2 to generate the anion, whose binding is diminished within the negatively charged carboxylic groups of the hangman cleft. The results demonstrate the pronounced role that nonbonding electrostatic interactions may play in CO2RR and highlight the need to manage deleterious electrostatic interactions during catalytic turnover.
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Affiliation(s)
- Charles G Margarit
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, United States
| | - Naomi G Asimow
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, United States
| | - Miguel I Gonzalez
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, United States
| | - Daniel G Nocera
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, United States
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16
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Reuillard B, Blanco M, Calvillo L, Coutard N, Ghedjatti A, Chenevier P, Agnoli S, Otyepka M, Granozzi G, Artero V. Noncovalent Integration of a Bioinspired Ni Catalyst to Graphene Acid for Reversible Electrocatalytic Hydrogen Oxidation. ACS APPLIED MATERIALS & INTERFACES 2020; 12:5805-5811. [PMID: 31912737 PMCID: PMC7009173 DOI: 10.1021/acsami.9b18922] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/19/2019] [Accepted: 01/07/2020] [Indexed: 06/10/2023]
Abstract
Efficient heterogeneous catalysis of hydrogen oxidation reaction (HOR) by platinum group metal (PGM)-free catalysts in proton-exchange membrane (PEM) fuel cells represents a significant challenge toward the development of a sustainable hydrogen economy. Here, we show that graphene acid (GA) can be used as an electrode scaffold for the noncovalent immobilization of a bioinspired nickel bis-diphosphine HOR catalyst. The highly functionalized structure of this material and optimization of the electrode-catalyst assembly sets new benchmark electrocatalytic performances for heterogeneous molecular HOR, with current densities above 30 mA cm-2 at 0.4 V versus reversible hydrogen electrode in acidic aqueous conditions and at room temperature. This study also shows the great potential of GA for catalyst loading improvement and porosity management within nanostructured electrodes toward achieving high current densities with a noble-metal free molecular catalyst.
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Affiliation(s)
- Bertrand Reuillard
- Univ. Grenoble
Alpes, CEA, CNRS, IRIG, Laboratoire de Chimie et Biologie des Métaux, F-38000 Grenoble, France
| | - Matías Blanco
- Department of Chemical Sciences, University of Padova, Via Marzolo 1, 35131 Padova, Italy
| | - Laura Calvillo
- Department of Chemical Sciences, University of Padova, Via Marzolo 1, 35131 Padova, Italy
| | - Nathan Coutard
- Univ. Grenoble
Alpes, CEA, CNRS, IRIG, Laboratoire de Chimie et Biologie des Métaux, F-38000 Grenoble, France
| | - Ahmed Ghedjatti
- Univ. Grenoble
Alpes, CEA, CNRS, IRIG, Laboratoire de Chimie et Biologie des Métaux, F-38000 Grenoble, France
| | - Pascale Chenevier
- Univ. Grenoble Alpes, CEA,
CNRS, IRIG, SYMMES, F-38000 Grenoble, France
| | - Stefano Agnoli
- Department of Chemical Sciences, University of Padova, Via Marzolo 1, 35131 Padova, Italy
| | - Michal Otyepka
- Regional Centre
of Advanced Technologies and Materials, Department of Physical Chemistry, Palacký University Olomouc, 17. listopadu 1192/12, 771 46 Olomouc, Czech Republic
| | - Gaetano Granozzi
- Department of Chemical Sciences, University of Padova, Via Marzolo 1, 35131 Padova, Italy
| | - Vincent Artero
- Univ. Grenoble
Alpes, CEA, CNRS, IRIG, Laboratoire de Chimie et Biologie des Métaux, F-38000 Grenoble, France
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17
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Liu T, Tyburski R, Wang S, Fernández-Terán R, Ott S, Hammarström L. Elucidating Proton-Coupled Electron Transfer Mechanisms of Metal Hydrides with Free Energy- and Pressure-Dependent Kinetics. J Am Chem Soc 2019; 141:17245-17259. [PMID: 31587555 DOI: 10.1021/jacs.9b08189] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Proton-coupled electron transfer (PCET) was studied in a series of tungsten hydride complexes with pendant pyridyl arms ([(PyCH2Cp)WH(CO)3], PyCH2Cp = pyridylmethylcyclopentadienyl), triggered by laser flash-generated RuIII-tris-bipyridine oxidants, in acetonitrile solution. The free energy dependence of the rate constant and the kinetic isotope effects (KIEs) showed that the PCET mechanism could be switched between concerted and the two stepwise PCET mechanisms (electron-first or proton-first) in a predictable fashion. Straightforward and general guidelines for how the relative rates of the different mechanisms depend on oxidant and base are presented. The rate of the concerted reaction should depend symmetrically on changes in oxidant and base strength, that is on the overall ΔG0PCET, and we argue that an "asynchronous" behavior would not be consistent with a model where the electron and proton tunnel from a common transition state. The observed rate constants and KIEs were examined as a function of hydrostatic pressure (1-2000 bar) and were found to exhibit qualitatively different dependence on pressure for different PCET mechanisms. This is discussed in terms of different volume profiles of the PCET mechanisms as well as enhanced proton tunneling for the concerted mechanism. The results allowed for assignment of the main mechanism operating in the different cases, which is one of the critical questions in PCET research. They also show how the rate of a PCET reaction will be affected very differently by changes of oxidant and base strength, depending on which mechanism dominates. This is of fundamental interest as well as of practical importance for rational design of, for example, catalysts for fuel cells and solar fuel formation, which operate in steps of PCET reactions. The mechanistic richness shown by this system illustrates that the specific mechanism is not intrinsic to a specific synthetic catalyst or enzyme active site but depends on the reaction conditions.
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Affiliation(s)
- Tianfei Liu
- Department of Chemistry, Ångström Laboratory , Uppsala University , Box 532, SE-751 20 Uppsala , Sweden
| | - Robin Tyburski
- Department of Chemistry, Ångström Laboratory , Uppsala University , Box 532, SE-751 20 Uppsala , Sweden
| | - Shihuai Wang
- Department of Chemistry, Ångström Laboratory , Uppsala University , Box 532, SE-751 20 Uppsala , Sweden
| | - Ricardo Fernández-Terán
- Department of Chemistry, Ångström Laboratory , Uppsala University , Box 532, SE-751 20 Uppsala , Sweden
| | - Sascha Ott
- Department of Chemistry, Ångström Laboratory , Uppsala University , Box 532, SE-751 20 Uppsala , Sweden
| | - Leif Hammarström
- Department of Chemistry, Ångström Laboratory , Uppsala University , Box 532, SE-751 20 Uppsala , Sweden
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18
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Shan B, Brennaman MK, Troian-Gautier L, Liu Y, Nayak A, Klug CM, Li TT, Bullock RM, Meyer TJ. A Silicon-Based Heterojunction Integrated with a Molecular Excited State in a Water-Splitting Tandem Cell. J Am Chem Soc 2019; 141:10390-10398. [DOI: 10.1021/jacs.9b04238] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Bing Shan
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
| | - M. Kyle Brennaman
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
| | - Ludovic Troian-Gautier
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
| | - Yanming Liu
- Key Laboratory of Industrial Ecology and Environmental Engineering, Dalian University of Technology, Dalian 116024, China
| | - Animesh Nayak
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
| | - Christina M. Klug
- Center for Molecular Electrocatalysis, Pacific Northwest National Laboratory, P.O. Box 999, K2-12, Richland, Washington 99352, United States
| | - Ting-Ting Li
- Research Center of Applied Solid State Chemistry, Ningbo University, Ningbo 315211, China
| | - R. Morris Bullock
- Center for Molecular Electrocatalysis, Pacific Northwest National Laboratory, P.O. Box 999, K2-12, Richland, Washington 99352, United States
| | - Thomas J. Meyer
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
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19
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Zhan S, De Gracia Triviño JA, Ahlquist MSG. The Carboxylate Ligand as an Oxide Relay in Catalytic Water Oxidation. J Am Chem Soc 2019; 141:10247-10252. [DOI: 10.1021/jacs.9b02585] [Citation(s) in RCA: 35] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Shaoqi Zhan
- Department of Theoretical Chemistry & Biology, School of Engineering Sciences in Chemistry Biotechnology and Health, KTH Royal Institute of Technology, 10691 Stockholm, Sweden
| | - Juan Angel De Gracia Triviño
- Department of Theoretical Chemistry & Biology, School of Engineering Sciences in Chemistry Biotechnology and Health, KTH Royal Institute of Technology, 10691 Stockholm, Sweden
| | - Mårten S. G. Ahlquist
- Department of Theoretical Chemistry & Biology, School of Engineering Sciences in Chemistry Biotechnology and Health, KTH Royal Institute of Technology, 10691 Stockholm, Sweden
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20
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Pegis ML, Martin DJ, Wise CF, Brezny AC, Johnson SI, Johnson LE, Kumar N, Raugei S, Mayer JM. Mechanism of Catalytic O 2 Reduction by Iron Tetraphenylporphyrin. J Am Chem Soc 2019; 141:8315-8326. [PMID: 31042028 DOI: 10.1021/jacs.9b02640] [Citation(s) in RCA: 65] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
The catalytic reduction of O2 to H2O is important for energy transduction in both synthetic and natural systems. Herein, we report a kinetic and thermochemical study of the oxygen reduction reaction (ORR) catalyzed by iron tetraphenylporphyrin (Fe(TPP)) in N, N'-dimethylformamide using decamethylferrocene as a soluble reductant and para-toluenesulfonic acid ( pTsOH) as the proton source. This work identifies and characterizes catalytic intermediates and their thermochemistry, providing a detailed mechanistic understanding of the system. Specifically, reduction of the ferric porphyrin, [FeIII(TPP)]+, forms the ferrous porphyrin, FeII(TPP), which binds O2 reversibly to form the ferric-superoxide porphyrin complex, FeIII(TPP)(O2•-). The temperature dependence of both the electron transfer and O2 binding equilibrium constants has been determined. Kinetic studies over a range of concentrations and temperatures show that the catalyst resting state changes during the course of each catalytic run, necessitating the use of global kinetic modeling to extract rate constants and kinetic barriers. The rate-determining step in oxygen reduction is the protonation of FeIII(TPP)(O2•-) by pTsOH, which proceeds with a substantial kinetic barrier. Computational studies indicate that this barrier for proton transfer arises from an unfavorable preassociation of the proton donor with the superoxide adduct and a transition state that requires significant desolvation of the proton donor. Together, these results are the first example of oxygen reduction by iron tetraphenylporphyrin where the pre-equilibria among ferric, ferrous, and ferric-superoxide intermediates have been quantified under catalytic conditions. This work gives a generalizable model for the mechanism of iron porphyrin-catalyzed ORR and provides an unusually complete mechanistic study of an ORR reaction. More broadly, this study also highlights the kinetic challenges for proton transfer to catalytic intermediates in organic media.
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Affiliation(s)
- Michael L Pegis
- Department of Chemistry , Yale University , P.O Box 208107, New Haven , Connecticut 06520-8107 , United States
| | - Daniel J Martin
- Department of Chemistry , Yale University , P.O Box 208107, New Haven , Connecticut 06520-8107 , United States
| | - Catherine F Wise
- Department of Chemistry , Yale University , P.O Box 208107, New Haven , Connecticut 06520-8107 , United States
| | - Anna C Brezny
- Department of Chemistry , Yale University , P.O Box 208107, New Haven , Connecticut 06520-8107 , United States
| | | | - Lewis E Johnson
- Department of Chemistry , University of Washington , Box 351700 Seattle , Washington 98195-1700 , United States
| | | | | | - James M Mayer
- Department of Chemistry , Yale University , P.O Box 208107, New Haven , Connecticut 06520-8107 , United States
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21
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Dutta A, Shaw WJ. Chemical Method for Evaluating Catalytic Turnover Frequencies (TOF) of Moderate to Slow H 2 Oxidation Electrocatalysts. Organometallics 2019. [DOI: 10.1021/acs.organomet.8b00580] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Arnab Dutta
- Pacific Northwest National Laboratory, Richland, Washington 99354, United States
| | - Wendy J. Shaw
- Pacific Northwest National Laboratory, Richland, Washington 99354, United States
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22
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Dalle K, Warnan J, Leung JJ, Reuillard B, Karmel IS, Reisner E. Electro- and Solar-Driven Fuel Synthesis with First Row Transition Metal Complexes. Chem Rev 2019; 119:2752-2875. [PMID: 30767519 PMCID: PMC6396143 DOI: 10.1021/acs.chemrev.8b00392] [Citation(s) in RCA: 440] [Impact Index Per Article: 88.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2018] [Indexed: 12/31/2022]
Abstract
The synthesis of renewable fuels from abundant water or the greenhouse gas CO2 is a major step toward creating sustainable and scalable energy storage technologies. In the last few decades, much attention has focused on the development of nonprecious metal-based catalysts and, in more recent years, their integration in solid-state support materials and devices that operate in water. This review surveys the literature on 3d metal-based molecular catalysts and focuses on their immobilization on heterogeneous solid-state supports for electro-, photo-, and photoelectrocatalytic synthesis of fuels in aqueous media. The first sections highlight benchmark homogeneous systems using proton and CO2 reducing 3d transition metal catalysts as well as commonly employed methods for catalyst immobilization, including a discussion of supporting materials and anchoring groups. The subsequent sections elaborate on productive associations between molecular catalysts and a wide range of substrates based on carbon, quantum dots, metal oxide surfaces, and semiconductors. The molecule-material hybrid systems are organized as "dark" cathodes, colloidal photocatalysts, and photocathodes, and their figures of merit are discussed alongside system stability and catalyst integrity. The final section extends the scope of this review to prospects and challenges in targeting catalysis beyond "classical" H2 evolution and CO2 reduction to C1 products, by summarizing cases for higher-value products from N2 reduction, C x>1 products from CO2 utilization, and other reductive organic transformations.
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Affiliation(s)
| | | | - Jane J. Leung
- Christian Doppler Laboratory
for Sustainable SynGas Chemistry, Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, United Kingdom
| | - Bertrand Reuillard
- Christian Doppler Laboratory
for Sustainable SynGas Chemistry, Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, United Kingdom
| | - Isabell S. Karmel
- Christian Doppler Laboratory
for Sustainable SynGas Chemistry, Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, United Kingdom
| | - Erwin Reisner
- Christian Doppler Laboratory
for Sustainable SynGas Chemistry, Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, United Kingdom
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23
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Chambers GM, Johnson SI, Raugei S, Bullock RM. Anion control of tautomeric equilibria: Fe-H vs. N-H influenced by NH···F hydrogen bonding. Chem Sci 2019; 10:1410-1418. [PMID: 30842818 PMCID: PMC6369578 DOI: 10.1039/c8sc04239j] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2018] [Accepted: 10/04/2018] [Indexed: 12/21/2022] Open
Abstract
Counterions can play an active role in chemical reactivity, modulating reaction pathways, energetics and selectivity. We investigated the tautomeric equilibrium resulting from protonation of Fe(PEtNMePEt)(CO)3 (PEtNMePEt = (Et2PCH2)2NMe) at Fe or N. Protonation of Fe(PEtNMePEt)(CO)3 by [(Et2O)2H]+[B(C6F5)4]- occurs at the metal to give the iron hydride [Fe(PEtNMePEt)(CO)3H]+[B(C6F5)4]-. In contrast, treatment with HBF4·OEt2 gives protonation at the iron and at the pendant amine. Both the FeH and NH tautomers were characterized by single crystal X-ray diffraction. Addition of excess BF4 - to the equilibrium mixture leads to the NH tautomer being exclusively observed, due to NH···F hydrogen bonding. A quantum chemical analysis of the bonding properties of these systems provided a quantification of hydrogen bonding of the NH to BF4 - and to OTf-. Treatment of Fe(PEtNMePEt)(CO)3 with excess HOTf gives a dicationic complex where both the iron and nitrogen are protonated. Isomerization of the dicationic complex was studied by NOESY NMR spectroscopy.
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Affiliation(s)
- Geoffrey M Chambers
- Center for Molecular Electrocatalysis , Pacific Northwest National Laboratory , Richland , Washington 99352 , USA .
| | - Samantha I Johnson
- Center for Molecular Electrocatalysis , Pacific Northwest National Laboratory , Richland , Washington 99352 , USA .
| | - Simone Raugei
- Center for Molecular Electrocatalysis , Pacific Northwest National Laboratory , Richland , Washington 99352 , USA .
| | - R Morris Bullock
- Center for Molecular Electrocatalysis , Pacific Northwest National Laboratory , Richland , Washington 99352 , USA .
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24
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Wang JW, Liu WJ, Zhong DC, Lu TB. Nickel complexes as molecular catalysts for water splitting and CO2 reduction. Coord Chem Rev 2019. [DOI: 10.1016/j.ccr.2017.12.009] [Citation(s) in RCA: 106] [Impact Index Per Article: 21.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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25
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Thammavongsy Z, Mercer IP, Yang JY. Promoting proton coupled electron transfer in redox catalysts through molecular design. Chem Commun (Camb) 2019; 55:10342-10358. [DOI: 10.1039/c9cc05139b] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Mini-review on using the secondary coordination sphere to facilitate multi-electron, multi-proton catalysis.
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Affiliation(s)
| | - Ian P. Mercer
- Department of Chemistry
- University of California
- Irvine
- USA
| | - Jenny Y. Yang
- Department of Chemistry
- University of California
- Irvine
- USA
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26
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Bergamini G, Natali M. Homogeneous vs. heterogeneous catalysis for hydrogen evolution by a nickel(ii) bis(diphosphine) complex. Dalton Trans 2019; 48:14653-14661. [DOI: 10.1039/c9dt02846c] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
A nickel(ii) bis(diphosphine) complex bearing carboxylic acid groups has been tested as a catalyst for hydrogen evolution under different conditions.
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Affiliation(s)
- Giovanni Bergamini
- Department of Chemical and Pharmaceutical Sciences
- University of Ferrara
- Ferrara
- Italy
| | - Mirco Natali
- Department of Chemical and Pharmaceutical Sciences
- University of Ferrara
- Ferrara
- Italy
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27
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Cheung PM, Burns KT, Kwon YM, Deshaye MY, Aguayo KJ, Oswald VF, Seda T, Zakharov LN, Kowalczyk T, Gilbertson JD. Hemilabile Proton Relays and Redox Activity Lead to {FeNO} x and Significant Rate Enhancements in NO 2- Reduction. J Am Chem Soc 2018; 140:17040-17050. [PMID: 30427681 PMCID: PMC6668709 DOI: 10.1021/jacs.8b08520] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Incorporation of the triad of redox activity, hemilability, and proton responsivity into a single ligand scaffold is reported. Due to this triad, the complexes Fe(PyrrPDI)(CO)2 (3) and Fe(MorPDI)(CO)2 (4) display 40-fold enhancements in the initial rate of NO2- reduction, with respect to Fe(MeOPDI)(CO)2 (7). Utilizing the proper sterics and p Ka of the pendant base(s) to introduce hemilability into our ligand scaffolds, we report unusual {FeNO} x mononitrosyl iron complexes (MNICs) as intermediates in the NO2- reduction reaction. The {FeNO} x species behave spectroscopically and computationally similar to {FeNO}7, an unusual intermediate-spin Fe(III) coupled to triplet NO- and a singly reduced PDI ligand. These {FeNO} x MNICs facilitate enhancements in the initial rate.
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Affiliation(s)
- Pui Man Cheung
- Department of Chemistry, Western Washington University, Bellingham, Washington 98225, United States
| | - Kyle T. Burns
- Department of Chemistry, Western Washington University, Bellingham, Washington 98225, United States
| | - Yubin M. Kwon
- Department of Chemistry, Western Washington University, Bellingham, Washington 98225, United States
| | - Megan Y. Deshaye
- Department of Chemistry, Western Washington University, Bellingham, Washington 98225, United States
| | - Kristopher J. Aguayo
- Department of Chemistry, Western Washington University, Bellingham, Washington 98225, United States
| | - Victoria F. Oswald
- Department of Chemistry, University of California, Irvine, Irvine, California 92697, United States
| | - Takele Seda
- Department of Physics, Western Washington University, Bellingham, Washington 98225, United States
| | - Lev N. Zakharov
- Department of Chemistry, University of Oregon, Eugene, Oregon 97403, United States
| | - Tim Kowalczyk
- Department of Chemistry, Western Washington University, Bellingham, Washington 98225, United States
| | - John D. Gilbertson
- Department of Chemistry, Western Washington University, Bellingham, Washington 98225, United States
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28
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Klug CM, Dougherty WG, Kassel WS, Wiedner ES. Electrocatalytic Hydrogen Production by a Nickel Complex Containing a Tetradentate Phosphine Ligand. Organometallics 2018. [DOI: 10.1021/acs.organomet.8b00548] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Christina M. Klug
- Center for Molecular Electrocatalysis, Pacific Northwest National Laboratory, P.O. Box 999, K2-57, Richland, Washington 99352, United States
| | - William G. Dougherty
- Department of Chemistry, Villanova University, 800 East Lancaster Avenue, Villanova, Pennsylvania 19085, United States
| | - W. Scott Kassel
- Department of Chemistry, Villanova University, 800 East Lancaster Avenue, Villanova, Pennsylvania 19085, United States
| | - Eric S. Wiedner
- Center for Molecular Electrocatalysis, Pacific Northwest National Laboratory, P.O. Box 999, K2-57, Richland, Washington 99352, United States
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29
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30
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Accelerating proton-coupled electron transfer of metal hydrides in catalyst model reactions. Nat Chem 2018; 10:881-887. [DOI: 10.1038/s41557-018-0076-x] [Citation(s) in RCA: 50] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2017] [Accepted: 04/27/2018] [Indexed: 12/19/2022]
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31
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Rosenkoetter KE, Wojnar MK, Charette BJ, Ziller JW, Heyduk AF. Hydrogen-Atom Noninnocence of a Tridentate [SNS] Pincer Ligand. Inorg Chem 2018; 57:9728-9737. [DOI: 10.1021/acs.inorgchem.8b00618] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- Kyle E. Rosenkoetter
- Department of Chemistry, University of California, Irvine, California 92697-2025, United States
| | - Michael K. Wojnar
- Department of Chemistry, University of California, Irvine, California 92697-2025, United States
| | - Bronte J. Charette
- Department of Chemistry, University of California, Irvine, California 92697-2025, United States
| | - Joseph W. Ziller
- Department of Chemistry, University of California, Irvine, California 92697-2025, United States
| | - Alan F. Heyduk
- Department of Chemistry, University of California, Irvine, California 92697-2025, United States
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32
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Robinson SJC, Heinekey DM. Hydride & dihydrogen complexes of earth abundant metals: structure, reactivity, and applications to catalysis. Chem Commun (Camb) 2018; 53:669-676. [PMID: 27928559 DOI: 10.1039/c6cc07529k] [Citation(s) in RCA: 47] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Recent developments in the chemistry of hydride and dihydrogen complexes of iron, cobalt, and nickel are summarized. Applications in homogeneous catalysis are emphasized.
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Affiliation(s)
| | - D M Heinekey
- University of Washington, Department of Chemistry, Seattle, WA, USA
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33
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Unpredicted concurrency between P,P-chelate and P,P-bridge coordination modes of 1,5-diR-3,7-di(pyridine-2-yl)-1,5-diaza-3,7-diphosphacyclooctane ligands in copper(I) complexes. Polyhedron 2018. [DOI: 10.1016/j.poly.2017.09.047] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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34
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Luo SP, Peng QX, Liu J, Zhan SZ. Effect of metal centers on electrocatalytic hydrogen generation catalyzed by coordinatively saturated metal-1,10-phenanthroline complexes. Polyhedron 2018. [DOI: 10.1016/j.poly.2017.10.010] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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35
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Johnson SI, Gray HB, Blakemore JD, Goddard WA. Role of Ligand Protonation in Dihydrogen Evolution from a Pentamethylcyclopentadienyl Rhodium Catalyst. Inorg Chem 2017; 56:11375-11386. [DOI: 10.1021/acs.inorgchem.7b01698] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Samantha I. Johnson
- Center for Chemical
Innovation in Solar Fuels, California Institute of Technology, Pasadena, California 91125, United States
- Materials Research Center, California Institute of Technology, Pasadena, California 91125, United States
| | - Harry B. Gray
- Center for Chemical
Innovation in Solar Fuels, California Institute of Technology, Pasadena, California 91125, United States
| | - James D. Blakemore
- Department of Chemistry, University of Kansas, Lawrence, Kansas 66045-7582, United States
| | - William A. Goddard
- Materials Research Center, California Institute of Technology, Pasadena, California 91125, United States
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36
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Klug CM, O’Hagan M, Bullock RM, Appel AM, Wiedner ES. Impact of Weak Agostic Interactions in Nickel Electrocatalysts for Hydrogen Oxidation. Organometallics 2017. [DOI: 10.1021/acs.organomet.7b00103] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Christina M. Klug
- Center for Molecular Electrocatalysis, Pacific Northwest National Laboratory, P.O. Box 999, K2-57, Richland, Washington 99352, United States
| | - Molly O’Hagan
- Center for Molecular Electrocatalysis, Pacific Northwest National Laboratory, P.O. Box 999, K2-57, Richland, Washington 99352, United States
| | - R. Morris Bullock
- Center for Molecular Electrocatalysis, Pacific Northwest National Laboratory, P.O. Box 999, K2-57, Richland, Washington 99352, United States
| | - Aaron M. Appel
- Center for Molecular Electrocatalysis, Pacific Northwest National Laboratory, P.O. Box 999, K2-57, Richland, Washington 99352, United States
| | - Eric S. Wiedner
- Center for Molecular Electrocatalysis, Pacific Northwest National Laboratory, P.O. Box 999, K2-57, Richland, Washington 99352, United States
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37
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Zhang S, Appel AM, Bullock RM. Reversible Heterolytic Cleavage of the H–H Bond by Molybdenum Complexes: Controlling the Dynamics of Exchange Between Proton and Hydride. J Am Chem Soc 2017; 139:7376-7387. [DOI: 10.1021/jacs.7b03053] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Shaoguang Zhang
- Pacific Northwest National Laboratory, P.O. Box 999, K2-12, Richland, Washington 99352, United States
| | - Aaron M. Appel
- Pacific Northwest National Laboratory, P.O. Box 999, K2-12, Richland, Washington 99352, United States
| | - R. Morris Bullock
- Pacific Northwest National Laboratory, P.O. Box 999, K2-12, Richland, Washington 99352, United States
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38
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Stubbs JM, Hazlehurst RJ, Boyle PD, Blacquiere JM. Catalytic Acceptorless Dehydrogenation of Amines with Ru(PR2NR′2) and Ru(dppp) Complexes. Organometallics 2017. [DOI: 10.1021/acs.organomet.6b00870] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- James M. Stubbs
- Department of Chemistry, University of Western Ontario, London, Ontario N6A 5B7, Canada
| | - Richard J. Hazlehurst
- Department of Chemistry, University of Western Ontario, London, Ontario N6A 5B7, Canada
| | - Paul D. Boyle
- Department of Chemistry, University of Western Ontario, London, Ontario N6A 5B7, Canada
| | - Johanna M. Blacquiere
- Department of Chemistry, University of Western Ontario, London, Ontario N6A 5B7, Canada
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39
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Khrizanforova V, Morozov V, Strelnik A, Spiridonova YS, Khrizanforov M, Burganov T, Katsyuba S, Latypov SK, Kadirov M, Karasik A, Sinyashin O, Budnikova Y. In situ electrochemical synthesis of Ni(I) complexes with aminomethylphosphines as intermediates for hydrogen evolution. Electrochim Acta 2017. [DOI: 10.1016/j.electacta.2016.12.081] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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40
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Zhao X, Wang P, Long M. Electro- and Photocatalytic Hydrogen Production by Molecular Cobalt Complexes With Pentadentate Ligands. COMMENT INORG CHEM 2016. [DOI: 10.1080/02603594.2016.1266618] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- Xuan Zhao
- Department of Chemistry, University of Memphis, Memphis, Tennessee, USA
| | - Ping Wang
- Department of Chemistry, University of Memphis, Memphis, Tennessee, USA
| | - Melissa Long
- Department of Chemistry, University of Memphis, Memphis, Tennessee, USA
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41
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Quantitative Analysis of Homogeneous Electrocatalytic Reactions at IDA Electrodes: The Example of [Ni(PPh2NBn2)2]2+. Electrochim Acta 2016. [DOI: 10.1016/j.electacta.2016.10.176] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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42
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Priyadarshani N, Dutta A, Ginovska B, Buchko GW, O’Hagan M, Raugei S, Shaw WJ. Achieving Reversible H2/H+ Interconversion at Room Temperature with Enzyme-Inspired Molecular Complexes: A Mechanistic Study. ACS Catal 2016. [DOI: 10.1021/acscatal.6b01433] [Citation(s) in RCA: 43] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Nilusha Priyadarshani
- Pacific Northwest National Laboratory, P.O. Box 999, Richland, Washington 99352, United States
| | - Arnab Dutta
- Pacific Northwest National Laboratory, P.O. Box 999, Richland, Washington 99352, United States
| | - Bojana Ginovska
- Pacific Northwest National Laboratory, P.O. Box 999, Richland, Washington 99352, United States
| | - Garry W. Buchko
- Pacific Northwest National Laboratory, P.O. Box 999, Richland, Washington 99352, United States
| | - Molly O’Hagan
- Pacific Northwest National Laboratory, P.O. Box 999, Richland, Washington 99352, United States
| | - Simone Raugei
- Pacific Northwest National Laboratory, P.O. Box 999, Richland, Washington 99352, United States
| | - Wendy J. Shaw
- Pacific Northwest National Laboratory, P.O. Box 999, Richland, Washington 99352, United States
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43
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REBACK MATTHEWL, GINOVSKA BOJANA, BUCHKO GARRYW, DUTTA ARNAB, PRIYADARSHANI NILUSHA, KIER BRANDONL, HELM MONTEL, RAUGEI SIMONE, SHAW WENDYJ. Investigating the role of chain and linker length on the catalytic activity of an H 2 production catalyst containing a β-hairpin peptide. J COORD CHEM 2016; 69:1730-1747. [PMID: 33093711 PMCID: PMC7577397 DOI: 10.1080/00958972.2016.1188924] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2015] [Accepted: 03/23/2016] [Indexed: 12/20/2022]
Abstract
Building on our recent report of an active H2 production catalyst [Ni(PPh 2NProp-peptide)2]2+ (Prop = para-phenylpropionic acid, peptide (R10) = WIpPRWTGPR-NH2, p = D-proline and P2N = 1-aza-3,6-diphosphacycloheptane) that contains structured β-hairpin peptides, here we investigate how H2 production is effected by: (1) the length of the hairpin (eight or ten residues) and (2) limiting the flexibility between the peptide and the core complex by altering the length of the linker: para-phenylpropionic acid (three carbons) or para-benzoic acid (one carbon). Reduction of the peptide chain length from ten to eight residues increases or maintains the catalytic current for H2 production for all complexes, suggesting a non-productive steric interaction at longer peptide lengths. While the structure of the hairpin appears largely intact for the complexes, NMR data are consistent with differences in dynamic behavior which may contribute to the observed differences in catalytic activity. Molecular dynamics simulations demonstrate that complexes with a one-carbon linker have the desired effect of restricting the motion of the hairpin relative to the complex; however, the catalytic currents are significantly reduced compared to complexes containing a three-carbon linker as a result of the electron withdrawing nature of the -COOH group. These results demonstrate the complexity and interrelated nature of the outer coordination sphere on catalysis.
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Affiliation(s)
| | - BOJANA GINOVSKA
- Pacific Northwest National Laboratory, Richland, WA 99352, USA
| | - GARRY W. BUCHKO
- Pacific Northwest National Laboratory, Richland, WA 99352, USA
| | - ARNAB DUTTA
- Pacific Northwest National Laboratory, Richland, WA 99352, USA
| | | | | | - MONTE L. HELM
- Pacific Northwest National Laboratory, Richland, WA 99352, USA
| | - SIMONE RAUGEI
- Pacific Northwest National Laboratory, Richland, WA 99352, USA
| | - WENDY J. SHAW
- Pacific Northwest National Laboratory, Richland, WA 99352, USA
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Latypov S, Strelnik A, Balueva A, Spiridonova Y, Karasik A, Sinyashin O. Conformational Analysis of P,N-Containing Eight-Membered Heterocycles and Their Pt/Ni Complexes in Solution. Eur J Inorg Chem 2016. [DOI: 10.1002/ejic.201501331] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Wiedner ES, Brown HJS, Helm ML. Kinetic Analysis of Competitive Electrocatalytic Pathways: New Insights into Hydrogen Production with Nickel Electrocatalysts. J Am Chem Soc 2016; 138:604-16. [PMID: 26692398 DOI: 10.1021/jacs.5b10853] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
The hydrogen production electrocatalyst Ni(P(Ph)2N(Ph)2)2(2+) (1) is capable of traversing multiple electrocatalytic pathways. When using dimethylformamidium, DMF(H)(+), the mechanism of H2 formation by 1 changes from an ECEC to an EECC mechanism as the potential approaches the Ni(I/0) couple. Two electrochemical methods, current-potential analysis and foot-of-the-wave analysis (FOWA), were performed on 1 to measure detailed kinetics of the competing ECEC and EECC pathways. A sensitivity analysis was performed on the methods using digital simulations to understand their strengths and limitations. Chemical rate constants were significantly underestimated when not accounting for electron-transfer kinetics, even when electron transfer was fast enough to afford a reversible noncatalytic wave. The EECC pathway of 1 was faster than the ECEC pathway under all conditions studied. Buffered DMF:DMF(H)(+) mixtures afforded an increase in the catalytic rate constant (k(obs)) of the EECC pathway, but k(obs) for the ECEC pathway did not change when using buffered acid. Further kinetic analysis of the ECEC path revealed that base increases the rate of isomerization from exo-protonated Ni(0) isomers to the catalytically active endo-isomers, but decreases the rate of protonation of Ni(I). FOWA did not provide accurate rate constants, but FOWA was used to estimate the reduction potential of the previously undetected exo-protonated Ni(I) intermediate. Comparison of catalytic Tafel plots for 1 under different conditions reveals substantial inaccuracies in the turnover frequency at zero overpotential when the kinetic and thermodynamic effects of the conjugate base are not accounted for properly.
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Affiliation(s)
- Eric S Wiedner
- Center for Molecular Electrocatalysis, Pacific Northwest National Laboratory , P.O. Box 999, K2-57, Richland, Washington 99352, United States
| | - Houston J S Brown
- Center for Molecular Electrocatalysis, Pacific Northwest National Laboratory , P.O. Box 999, K2-57, Richland, Washington 99352, United States
| | - Monte L Helm
- Center for Molecular Electrocatalysis, Pacific Northwest National Laboratory , P.O. Box 999, K2-57, Richland, Washington 99352, United States
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Raugei S, Helm ML, Hammes-Schiffer S, Appel AM, O’Hagan M, Wiedner ES, Bullock RM. Experimental and Computational Mechanistic Studies Guiding the Rational Design of Molecular Electrocatalysts for Production and Oxidation of Hydrogen. Inorg Chem 2015; 55:445-60. [DOI: 10.1021/acs.inorgchem.5b02262] [Citation(s) in RCA: 63] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Simone Raugei
- Center for Molecular Electrocatalysis,
Physical Sciences Division, Pacific Northwest National Laboratory, P.O. Box 999, K2−12, Richland, Washington 99352, United States
| | - Monte L. Helm
- Center for Molecular Electrocatalysis,
Physical Sciences Division, Pacific Northwest National Laboratory, P.O. Box 999, K2−12, Richland, Washington 99352, United States
| | - Sharon Hammes-Schiffer
- Department of Chemistry, University of Illinois at Urbana—Champaign, 600 South Mathews Avenue, Urbana, Illinois 61801, United States
| | - Aaron M. Appel
- Center for Molecular Electrocatalysis,
Physical Sciences Division, Pacific Northwest National Laboratory, P.O. Box 999, K2−12, Richland, Washington 99352, United States
| | - Molly O’Hagan
- Center for Molecular Electrocatalysis,
Physical Sciences Division, Pacific Northwest National Laboratory, P.O. Box 999, K2−12, Richland, Washington 99352, United States
| | - Eric S. Wiedner
- Center for Molecular Electrocatalysis,
Physical Sciences Division, Pacific Northwest National Laboratory, P.O. Box 999, K2−12, Richland, Washington 99352, United States
| | - R. Morris Bullock
- Center for Molecular Electrocatalysis,
Physical Sciences Division, Pacific Northwest National Laboratory, P.O. Box 999, K2−12, Richland, Washington 99352, United States
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48
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Dutta A, Lense S, Roberts JAS, Helm ML, Shaw WJ. The Role of Solvent and the Outer Coordination Sphere on H2Oxidation Using [Ni(PCy2NPyz2)2]2+. Eur J Inorg Chem 2015. [DOI: 10.1002/ejic.201500732] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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49
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Rountree ES, Dempsey JL. Potential-Dependent Electrocatalytic Pathways: Controlling Reactivity with pKa for Mechanistic Investigation of a Nickel-Based Hydrogen Evolution Catalyst. J Am Chem Soc 2015; 137:13371-80. [DOI: 10.1021/jacs.5b08297] [Citation(s) in RCA: 60] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Eric S. Rountree
- Department of Chemistry, University of North Carolina, Chapel Hill, North Carolina 27599-3290, United States
| | - Jillian L. Dempsey
- Department of Chemistry, University of North Carolina, Chapel Hill, North Carolina 27599-3290, United States
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Smith DA, Beweries T, Blasius C, Jasim N, Nazir R, Nazir S, Robertson CC, Whitwood AC, Hunter CA, Brammer L, Perutz RN. The Contrasting Character of Early and Late Transition Metal Fluorides as Hydrogen Bond Acceptors. J Am Chem Soc 2015; 137:11820-31. [DOI: 10.1021/jacs.5b07509] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Dan A. Smith
- Department of Chemistry, University of York, Heslington, York, YO10 5DD, U.K
| | - Torsten Beweries
- Department of Chemistry, University of York, Heslington, York, YO10 5DD, U.K
| | - Clemens Blasius
- Department of Chemistry, University of York, Heslington, York, YO10 5DD, U.K
| | - Naseralla Jasim
- Department of Chemistry, University of York, Heslington, York, YO10 5DD, U.K
| | - Ruqia Nazir
- Department of Chemistry, University of York, Heslington, York, YO10 5DD, U.K
| | - Sadia Nazir
- Department of Chemistry, University of York, Heslington, York, YO10 5DD, U.K
| | - Craig C. Robertson
- Department of Chemistry, University of Sheffield, Sheffield, S3 7HF, U.K
| | - Adrian C. Whitwood
- Department of Chemistry, University of York, Heslington, York, YO10 5DD, U.K
| | | | - Lee Brammer
- Department of Chemistry, University of Sheffield, Sheffield, S3 7HF, U.K
| | - Robin N. Perutz
- Department of Chemistry, University of York, Heslington, York, YO10 5DD, U.K
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