1
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Lourenço DL, Fernandes AC. Reduction of sulfoxides catalyzed by the commercially available manganese complex MnBr(CO) 5. Org Biomol Chem 2024; 22:3746-3751. [PMID: 38652042 DOI: 10.1039/d4ob00204k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/25/2024]
Abstract
A new methodology for the reduction of a wide variety of aliphatic and aromatic sulfoxides catalyzed by the air-stable, cheap and commercially available manganese catalyst MnBr(CO)5 with excellent yields is reported in this work. The catalytic system MnBr(CO)5/PhSiH3 is highly chemoselective, allowing the effective reduction of the SO bond in the presence of different functional groups.
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Affiliation(s)
- Daniel L Lourenço
- Centro de Química Estrutural, Institute of Molecular Sciences, Departamento de Engenharia Química, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal.
| | - Ana C Fernandes
- Centro de Química Estrutural, Institute of Molecular Sciences, Departamento de Engenharia Química, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal.
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2
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Florian J, Cole JM. Analyzing Structure-Activity Variations for Mn-Carbonyl Complexes in the Reduction of CO 2 to CO. Inorg Chem 2023; 62:318-335. [PMID: 36541860 PMCID: PMC9832541 DOI: 10.1021/acs.inorgchem.2c03391] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Contemporary electrocatalysts for the reduction of CO2 often suffer from low stability, activity, and selectivity, or a combination thereof. Mn-carbonyl complexes represent a promising class of molecular electrocatalysts for the reduction of CO2 to CO as they are able to promote this reaction at relatively mild overpotentials, whereby rare-earth metals are not required. The electronic and geometric structure of the reaction center of these molecular electrocatalysts is precisely known and can be tuned via ligand modifications. However, ligand characteristics that are required to achieve high catalytic turnover at minimal overpotential remain unclear. We consider 55 Mn-carbonyl complexes, which have previously been synthesized and characterized experimentally. Four intermediates were identified that are common across all catalytic mechanisms proposed for Mn-carbonyl complexes, and their structures were used to calculate descriptors for each of the 55 Mn-carbonyl complexes. These electronic-structure-based descriptors encompass the binding energies, the highest occupied and lowest unoccupied molecular orbitals, and partial charges. Trends in turnover frequency and overpotential with these descriptors were analyzed to afford meaningful physical insights into what ligand characteristics lead to good catalytic performance, and how this is affected by the reaction conditions. These insights can be expected to significantly contribute to the rational design of more active Mn-carbonyl electrocatalysts.
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Affiliation(s)
- Jacob Florian
- Cavendish
Laboratory, University of Cambridge, J.J. Thomson Avenue, Cambridge CB3 0HE, U.K.
| | - Jacqueline M. Cole
- Cavendish
Laboratory, University of Cambridge, J.J. Thomson Avenue, Cambridge CB3 0HE, U.K.,ISIS
Neutron and Muon Source, STFC Rutherford
Appleton Laboratory, Harwell Campus for Science and Innovation, Didcot OX11 0QX, U.K.,
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3
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Blasczak V, McKinnon M, Suntrup L, Aminudin NA, Reed B, Groysman S, Ertem MZ, Grills DC, Rochford J. Steric and Lewis Basicity Influence of the Second Coordination Sphere on Electrocatalytic CO 2 Reduction by Manganese Bipyridyl Complexes. Inorg Chem 2022; 61:15784-15800. [PMID: 36162397 DOI: 10.1021/acs.inorgchem.2c02586] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
This study aims to provide a greater insight into the balance between steric (bpy vs (Ph)2bpy vs mes2bpy ligands) and Lewis basic ((Ph)2bpy vs (MeOPh)2bpy vs (MeSPh)2bpy ligands) influence on the efficiencies of the protonation-first vs reduction-first CO2 reduction mechanisms with [MnI(R2bpy)(CO)3(CH3CN)]+ precatalysts, and on their respective transition-state geometries/energies for rate-determining C-OH bond cleavage toward CO evolution. The presence of only modest steric bulk at the 6,6'-diphenyl-2,2'-bipyridyl ((Ph)2bpy) ligand has here allowed unique insight into the mechanism of catalyst activation and CO2 binding by navigating a perfect medium between the nonsterically encumbered bpy-based and the highly sterically encumbered mes2bpy-based precatalysts. Cyclic voltammetry conducted in CO2-saturated electrolyte for the (Ph)2bpy-based precatalyst [2-CH3CN]+ confirms that CO2 binding occurs at the two-electron-reduced activated catalyst [2]- in the absence of an excess proton source, in contrast to prior assumptions that all manganese catalysts require a strong acid for CO2 binding. This observation is supported by computed free energies of the parent-child reaction for [Mn-Mn]0 dimer formation, where increased steric hindrance relative to the bpy-based precatalyst correlates with favorable CO2 binding. A critical balance must be adhered to, however, as the absence of steric bulk in the bpy-based precatalyst [1-CH3CN]+ maintains a lower overpotential than [2-CH3CN]+ at the protonation-first pathway with comparable kinetic performance, whereas an ∼2-fold greater TOFmax is observed at its reduction-first pathway with an almost identical overpotential as [2-CH3CN]+. Notably, excessive steric bulk in the mes2bpy-based precatalyst [3-CH3CN]+ results in increased activation free energies of the C-OH bond cleavage transition states for both the protonation-first and the reduction-first pathways relative to both [1-CH3CN]+ and [2-CH3CN]+. In fact, [3-CH3CN]+ requires a 1 V window beyond its onset potential to reach its peak catalytic current, which is in contrast to the narrower (<0.30 V) potential response window of the remaining catalysts here studied. Voltammetry recorded under 1 atm of CO2 with 2.8 M (5%) H2O establishes [2-CH3CN]+ to have the lowest overpotential (η = 0.75 V) in the series here studied, attributed to its ability to lie "on the fence" when providing sufficient steric bulk to hinder (but not prevent) [Mn-Mn]0 dimerization, while simultaneously having a limited steric impact on the free energy of activation for the rate-determining C-OH bond cleavage transition state. While the methoxyphenyl bpy-based precatalyst [4-CH3CN]+ possesses an increased steric presence relative to [2-CH3CN]+, this is offset by its capacity to stabilize the C-OH bond cleavage transition states of both the protonation-first and the reduction-first pathways by facilitating second coordination sphere H-bonding stabilization.
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Affiliation(s)
- Vanna Blasczak
- Department of Chemistry, University of Massachusetts─Boston, 100 Morrissey Boulevard, Boston, Massachusetts 02125, United States
| | - Meaghan McKinnon
- Department of Chemistry, University of Massachusetts─Boston, 100 Morrissey Boulevard, Boston, Massachusetts 02125, United States
| | - Lisa Suntrup
- Department of Chemistry, University of Massachusetts─Boston, 100 Morrissey Boulevard, Boston, Massachusetts 02125, United States
| | - Nur Alisa Aminudin
- Department of Chemistry, University of Massachusetts─Boston, 100 Morrissey Boulevard, Boston, Massachusetts 02125, United States
| | - Blake Reed
- Department of Chemistry, Wayne State University, Detroit, Michigan 48202, United States
| | - Stanislav Groysman
- Department of Chemistry, Wayne State University, Detroit, Michigan 48202, United States
| | - Mehmed Z Ertem
- Chemistry Division, Brookhaven National Laboratory, Upton, New York 11973-5000, United States
| | - David C Grills
- Chemistry Division, Brookhaven National Laboratory, Upton, New York 11973-5000, United States
| | - Jonathan Rochford
- Department of Chemistry, University of Massachusetts─Boston, 100 Morrissey Boulevard, Boston, Massachusetts 02125, United States
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4
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Wu Q, Li M, He S, Xiong Y, Zhang P, Huang H, Chen L, Huang F, Li F. The hangman effect boosts hydrogen production by a manganese terpyridine complex. Chem Commun (Camb) 2022; 58:5128-5131. [PMID: 35380563 DOI: 10.1039/d2cc00757f] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The manganese terpyridine complex 1 with a coordinated carboxylate in the axial position was obtained in situ. By virtue of a hangman effect, complex 1 catalyzes electrochemical hydrogen evolution from phenol in acetonitrile solution with a turnover frequency of 525 s-1 at a low overpotential of ca. 230 mV.
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Affiliation(s)
- Qianqian Wu
- State Key Laboratory of Environment-Friendly Energy Materials, School of Materials Science and Engineering, Southwest University of Science and Technology, Mianyang 621010, P. R. China.
| | - Minghong Li
- State Key Laboratory of Environment-Friendly Energy Materials, School of Materials Science and Engineering, Southwest University of Science and Technology, Mianyang 621010, P. R. China.
| | - Shuanglin He
- State Key Laboratory of Environment-Friendly Energy Materials, School of Materials Science and Engineering, Southwest University of Science and Technology, Mianyang 621010, P. R. China.
| | - Ying Xiong
- State Key Laboratory of Environment-Friendly Energy Materials, School of Materials Science and Engineering, Southwest University of Science and Technology, Mianyang 621010, P. R. China.
| | - Ping Zhang
- State Key Laboratory of Environment-Friendly Energy Materials, School of Materials Science and Engineering, Southwest University of Science and Technology, Mianyang 621010, P. R. China.
| | - Heyan Huang
- State Key Laboratory of Environment-Friendly Energy Materials, School of Materials Science and Engineering, Southwest University of Science and Technology, Mianyang 621010, P. R. China.
| | - Lin Chen
- State Key Laboratory of Environment-Friendly Energy Materials, School of Materials Science and Engineering, Southwest University of Science and Technology, Mianyang 621010, P. R. China.
| | - Fang Huang
- College of Chemistry, Chemical Engineering and Materials Science, Shandong Normal University, Jinan 250014, P. R. China
| | - Fei Li
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116024, P. R. China
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5
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He S, Huang F, Wu Q, Zhang P, Xiong Y, Yang J, Zhang R, Wang F, Chen L, Liu TL, Li F. Multiple‐Site Concerted Proton–Electron Transfer in a Manganese‐Based Complete Functional Model for [FeFe]‐Hydrogenase. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202106983] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Shuanglin He
- State Key Laboratory of Environment-Friendly Energy Materials School of Materials Science and Engineering Southwest University of Science and Technology Mianyang 621010 P. R. China
| | - Fang Huang
- College of Chemistry, Chemical Engineering and Materials Science Shandong Normal University Jinan 250014 P. R. China
| | - Qianqian Wu
- State Key Laboratory of Environment-Friendly Energy Materials School of Materials Science and Engineering Southwest University of Science and Technology Mianyang 621010 P. R. China
| | - Ping Zhang
- State Key Laboratory of Environment-Friendly Energy Materials School of Materials Science and Engineering Southwest University of Science and Technology Mianyang 621010 P. R. China
| | - Ying Xiong
- State Key Laboratory of Environment-Friendly Energy Materials School of Materials Science and Engineering Southwest University of Science and Technology Mianyang 621010 P. R. China
| | - Jie Yang
- State Key Laboratory of Environment-Friendly Energy Materials School of Materials Science and Engineering Southwest University of Science and Technology Mianyang 621010 P. R. China
| | - Rong Zhang
- State Key Laboratory of Fine Chemicals Dalian University of Technology Dalian 116024 P. R. China
| | - Fang Wang
- Department of Chemistry and Biochemistry Utah State University College of Chemistry Logan Utah 84318 USA
| | - Lin Chen
- State Key Laboratory of Environment-Friendly Energy Materials School of Materials Science and Engineering Southwest University of Science and Technology Mianyang 621010 P. R. China
| | - T. Leo Liu
- Department of Chemistry and Biochemistry Utah State University College of Chemistry Logan Utah 84318 USA
| | - Fei Li
- State Key Laboratory of Fine Chemicals Dalian University of Technology Dalian 116024 P. R. China
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6
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He S, Huang F, Wu Q, Zhang P, Xiong Y, Yang J, Zhang R, Wang F, Chen L, Liu TL, Li F. Multiple-Site Concerted Proton-Electron Transfer in a Manganese-Based Complete Functional Model for [FeFe]-Hydrogenase. Angew Chem Int Ed Engl 2021; 60:25839-25845. [PMID: 34595813 DOI: 10.1002/anie.202106983] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2021] [Indexed: 11/10/2022]
Abstract
The active site of [FeFe]-hydrogenase (H2 ase) is preorganized with an amine (azadithiolate) as a proton relay and a [4Fe4S] subunit as an electron reservoir, which together lower the overpotential for proton reduction and hydrogen oxidation by multiple-site concerted proton-electron transfer (MS-CPET). Herein, we report a mononuclear manganese complex, fac-[Mn(CO)3 (6-(2-hydroxyphenol)-2-pyridine-2-quinoline) Br] (1), as a rare model to fully mimic the functions of the H2 ase. In 1, a redox-active bidentate ligand with a pendent phenol replicates the roles of the electron reservoir and the proton relay in the enzyme. Experimental and theoretical studies revealed two consecutive MS-CPET processes in the catalytic cycle, in each of which an electron stored in the reductive ligand and a proton at the proximal phenol moiety are transferred to the Mn center in a concerted way. By virtue of this mechanism, complex 1 exhibited a low overpotential comparable to that of natural enzyme in electrochemical hydrogen production using phenol as a proton source.
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Affiliation(s)
- Shuanglin He
- State Key Laboratory of Environment-Friendly Energy Materials, School of Materials Science and Engineering, Southwest University of Science and Technology, Mianyang, 621010, P. R. China
| | - Fang Huang
- College of Chemistry, Chemical Engineering and Materials Science, Shandong Normal University, Jinan, 250014, P. R. China
| | - Qianqian Wu
- State Key Laboratory of Environment-Friendly Energy Materials, School of Materials Science and Engineering, Southwest University of Science and Technology, Mianyang, 621010, P. R. China
| | - Ping Zhang
- State Key Laboratory of Environment-Friendly Energy Materials, School of Materials Science and Engineering, Southwest University of Science and Technology, Mianyang, 621010, P. R. China
| | - Ying Xiong
- State Key Laboratory of Environment-Friendly Energy Materials, School of Materials Science and Engineering, Southwest University of Science and Technology, Mianyang, 621010, P. R. China
| | - Jie Yang
- State Key Laboratory of Environment-Friendly Energy Materials, School of Materials Science and Engineering, Southwest University of Science and Technology, Mianyang, 621010, P. R. China
| | - Rong Zhang
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian, 116024, P. R. China
| | - Fang Wang
- Department of Chemistry and Biochemistry, Utah State University College of Chemistry, Logan, Utah, 84318, USA
| | - Lin Chen
- State Key Laboratory of Environment-Friendly Energy Materials, School of Materials Science and Engineering, Southwest University of Science and Technology, Mianyang, 621010, P. R. China
| | - T Leo Liu
- Department of Chemistry and Biochemistry, Utah State University College of Chemistry, Logan, Utah, 84318, USA
| | - Fei Li
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian, 116024, P. R. China
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7
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Mechanistic insight into electrocatalytic CO2 reduction using Lewis acid-base pairs. Inorganica Chim Acta 2021. [DOI: 10.1016/j.ica.2021.120528] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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8
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Marchi RC, Aguiar I, Camilo MR, Braga AH, Do Nascimento ESP, Santana VT, Nascimento OR, Carlos RM. Photochemical Properties of a Mononuclear Mn(I) Triscarbonyl Complex in Water: An Insight into Different Oxidation States. ChemistrySelect 2021. [DOI: 10.1002/slct.202102283] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Rafael C. Marchi
- Chemistry Department Universidade Federal de São Carlos - UFSCar. Rod. Washington Luis São Carlos SP 13565-905 Brazil
| | - Inara Aguiar
- Chemistry Department Universidade Federal de São Carlos - UFSCar. Rod. Washington Luis São Carlos SP 13565-905 Brazil
| | - Mariana R. Camilo
- Chemistry Department Universidade Federal de São Carlos - UFSCar. Rod. Washington Luis São Carlos SP 13565-905 Brazil
| | - Adriano H. Braga
- Chemical Engineering Department Universidade Federal de São Carlos - UFSCar. Rod. Washington Luis São Carlos SP 13565-905 Brazil
| | - Eduardo S. P. Do Nascimento
- Chemistry Department Universidade Federal de São Carlos - UFSCar. Rod. Washington Luis São Carlos SP 13565-905 Brazil
| | - Vinicius T. Santana
- Physics Institute Universidade de São Paulo-EECC Av. Trabalhador São Carlense São Carlos-SP 13560-970 Brazil
| | - Otaciro R. Nascimento
- Physics Institute Universidade de São Paulo-EECC Av. Trabalhador São Carlense São Carlos-SP 13560-970 Brazil
| | - Rose M. Carlos
- Chemistry Department Universidade Federal de São Carlos - UFSCar. Rod. Washington Luis São Carlos SP 13565-905 Brazil
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9
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Kinzel NW, Werlé C, Leitner W. Transition Metal Complexes as Catalysts for the Electroconversion of CO 2 : An Organometallic Perspective. Angew Chem Int Ed Engl 2021; 60:11628-11686. [PMID: 33464678 PMCID: PMC8248444 DOI: 10.1002/anie.202006988] [Citation(s) in RCA: 111] [Impact Index Per Article: 37.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2020] [Revised: 08/11/2020] [Indexed: 12/17/2022]
Abstract
The electrocatalytic transformation of carbon dioxide has been a topic of interest in the field of CO2 utilization for a long time. Recently, the area has seen increasing dynamics as an alternative strategy to catalytic hydrogenation for CO2 reduction. While many studies focus on the direct electron transfer to the CO2 molecule at the electrode material, molecular transition metal complexes in solution offer the possibility to act as catalysts for the electron transfer. C1 compounds such as carbon monoxide, formate, and methanol are often targeted as the main products, but more elaborate transformations are also possible within the coordination sphere of the metal center. This perspective article will cover selected examples to illustrate and categorize the currently favored mechanisms for the electrochemically induced transformation of CO2 promoted by homogeneous transition metal complexes. The insights will be corroborated with the concepts and elementary steps of organometallic catalysis to derive potential strategies to broaden the molecular diversity of possible products.
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Affiliation(s)
- Niklas W. Kinzel
- Max Planck Institute for Chemical Energy ConversionStiftstr. 34–3645470Mülheim an der RuhrGermany
- Institut für Technische und Makromolekulare Chemie (ITMC)RWTH Aachen UniversityWorringer Weg 252074AachenGermany
| | - Christophe Werlé
- Max Planck Institute for Chemical Energy ConversionStiftstr. 34–3645470Mülheim an der RuhrGermany
- Ruhr University BochumUniversitätsstr. 15044801BochumGermany
| | - Walter Leitner
- Max Planck Institute for Chemical Energy ConversionStiftstr. 34–3645470Mülheim an der RuhrGermany
- Institut für Technische und Makromolekulare Chemie (ITMC)RWTH Aachen UniversityWorringer Weg 252074AachenGermany
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10
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Yang J, He S, Wu Q, Zhang P, Chen L, Huang F, Li F. A bio-inspired mononuclear manganese catalyst for high-rate electrochemical hydrogen production. Dalton Trans 2021; 50:4783-4788. [PMID: 33725080 DOI: 10.1039/d1dt00672j] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
[FeFe]-hydrogenase (H2ase) catalyzes hydrogen evolution reactions (HERs), with an excellent performance that rivals that of platinum, the active site of which is built with crucial structural features required for efficient H-H bond formation. Herein, we report a mononuclear manganese complex (1) that contains a square pyramid coordination sphere and an intramolecular aniline as the proton relay, consistent with the crucial features of the active site in H2ase. Benefitting from these features, complex 1 electrocatalyzes the HER with a turnover frequency (TOF) exceeding 10 000 s-1 at -1.45 V (versus the ferrocenium/ferrocene couple) using anilinium tetrafluoroborate as a proton source. This work provides the first Mn-based functional model of H2ase, serving as a new paradigm for a high performance, low cost, environmentally benign hydrogen production electrocatalyst.
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Affiliation(s)
- Jie Yang
- State Key Laboratory of Environment-Friendly Energy Material, School of Materials Science and Engineering. Southwest University of Science and Technology, Mianyang 621010, P. R. China.
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11
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Moreno JJ, Hooe SL, Machan CW. DFT Study on the Electrocatalytic Reduction of CO 2 to CO by a Molecular Chromium Complex. Inorg Chem 2021; 60:3635-3650. [PMID: 33657314 DOI: 10.1021/acs.inorgchem.0c03136] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
A variety of molecular transition metal-based electrocatalysts for the reduction of carbon dioxide (CO2) have been developed to explore the viability of utilization strategies for addressing its rising atmospheric concentrations and the corresponding effects of global warming. Concomitantly, this approach could also meet steadily increasing global energy demands for value-added carbon-based chemical feedstocks as nonrenewable petrochemical resources are consumed. Reports on the molecular electrocatalytic reduction of CO2 mediated by chromium (Cr) complexes are scarce relative to other earth-abundant transition metals. Recently, our group reported a Cr complex that can efficiently catalyze the reduction of CO2 to carbon monoxide (CO) at low overpotentials. Here, we present new mechanistic insight through a computational (density functional theory) study, exploring the origin of kinetic selectivity, relative energetic positioning of the intermediates, speciation with respect to solvent coordination and spin state, as well as the role of the redox-active bipyridine moiety. Importantly, these studies suggest that under certain reducing conditions, the formation of bicarbonate could become a competitive reaction pathway, informing new areas of interest for future experimental studies.
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Affiliation(s)
- Juan J Moreno
- Department of Chemistry, University of Virginia, McCormick Road PO Box 400319, Charlottesville, Virginia 22904-4319, United States
| | - Shelby L Hooe
- Department of Chemistry, University of Virginia, McCormick Road PO Box 400319, Charlottesville, Virginia 22904-4319, United States
| | - Charles W Machan
- Department of Chemistry, University of Virginia, McCormick Road PO Box 400319, Charlottesville, Virginia 22904-4319, United States
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12
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Beltrán TF, Zaragoza G, Delaude L. Synthesis and characterization of cationic manganese–carbonyl complexes bearing imidazol(in)ium-2-dithiocarboxylate ligands. Polyhedron 2021. [DOI: 10.1016/j.poly.2021.115055] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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13
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Kinzel NW, Werlé C, Leitner W. Übergangsmetallkomplexe als Katalysatoren für die elektrische Umwandlung von CO
2
– eine metallorganische Perspektive. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202006988] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Niklas W. Kinzel
- Max-Planck-Institut für Chemische Energiekonversion Stiftstraße 34–36 45470 Mülheim an der Ruhr Deutschland
- Institut für Technische und Makromolekulare Chemie (ITMC) RWTH Aachen University Worringer Weg 2 52074 Aachen Deutschland
| | - Christophe Werlé
- Max-Planck-Institut für Chemische Energiekonversion Stiftstraße 34–36 45470 Mülheim an der Ruhr Deutschland
- Ruhr-Universität Bochum Universitätsstraße 150 44801 Bochum Deutschland
| | - Walter Leitner
- Max-Planck-Institut für Chemische Energiekonversion Stiftstraße 34–36 45470 Mülheim an der Ruhr Deutschland
- Institut für Technische und Makromolekulare Chemie (ITMC) RWTH Aachen University Worringer Weg 2 52074 Aachen Deutschland
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14
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Bhattacharya M, Sebghati S, VanderLinden RT, Saouma CT. Toward Combined Carbon Capture and Recycling: Addition of an Amine Alters Product Selectivity from CO to Formic Acid in Manganese Catalyzed Reduction of CO 2. J Am Chem Soc 2020; 142:17589-17597. [PMID: 32955864 DOI: 10.1021/jacs.0c07763] [Citation(s) in RCA: 32] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Owing to the energetic cost associated with CO2 release in carbon capture (CC), the combination of carbon capture and recycling (CCR) is an emerging area of research. In this approach, "captured CO2," typically generated by addition of amines, serves as a substrate for subsequent reduction. Herein, we report that the reduction of CO2 in the presence of morpholine (generating mixtures of the corresponding carbamate and carbamic acid) with a well-established Mn electrocatalyst changes the product selectivity from CO to H2 and formate. The change in selectivity is attributed to in situ generation of the morpholinium carbamic acid, which is sufficiently acidic to protonate the reduced Mn species and generate an intermediate Mn hydride. Thermodynamic studies indicate that the hydride is not sufficiently hydritic to reduce CO2 to formate, unless the apparent hydricity, which encompasses formate binding to the Mn, is considered. Increasing steric bulk around the Mn shuts down rapid homolytic H2 evolution rendering the intermediate Mn hydride more stable; subsequent CO2 insertion appears to be faster than heterolytic H2 production. A comprehensive mechanistic scheme is proposed that illustrates how thermodynamic analysis can provide further insight. Relevant to a range of hydrogenations and reductions is the modulation of the hydricity with substrate binding that makes the reaction favorable. Significantly, this work illustrates a new role for amines in CO2 reduction: changing the product selectivity; this is pertinent more broadly to advancing CCR.
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Affiliation(s)
- Moumita Bhattacharya
- Department of Chemistry, University of Utah, 315 S. 1400 E., Salt Lake City, Utah 84112, United States
| | - Sepehr Sebghati
- Department of Chemistry, University of Utah, 315 S. 1400 E., Salt Lake City, Utah 84112, United States
| | - Ryan T VanderLinden
- Department of Chemistry, University of Utah, 315 S. 1400 E., Salt Lake City, Utah 84112, United States
| | - Caroline T Saouma
- Department of Chemistry, University of Utah, 315 S. 1400 E., Salt Lake City, Utah 84112, United States
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15
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Lense S, Grice KA, Gillette K, Wolf LM, Robertson G, McKeon D, Saucedo C, Carroll PJ, Gau M. Effects of Tuning Intramolecular Proton Acidity on CO 2 Reduction by Mn Bipyridyl Species. Organometallics 2020. [DOI: 10.1021/acs.organomet.0c00230] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Sheri Lense
- Department of Chemistry, University of Wisconsin Oshkosh, 800 Algoma Boulevard, Oshkosh, Wisconsin 54902, United States
| | - Kyle A. Grice
- Department of Chemistry and Biochemistry, DePaul University, 1110 West Belden Avenue, Chicago, Illinois 60614, United States
| | - Kara Gillette
- Department of Chemistry, University of Wisconsin Oshkosh, 800 Algoma Boulevard, Oshkosh, Wisconsin 54902, United States
| | - Lucienna M. Wolf
- Department of Chemistry and Biochemistry, DePaul University, 1110 West Belden Avenue, Chicago, Illinois 60614, United States
| | - Grace Robertson
- Department of Chemistry, University of Wisconsin Oshkosh, 800 Algoma Boulevard, Oshkosh, Wisconsin 54902, United States
| | - Dylan McKeon
- Department of Chemistry, University of Wisconsin Oshkosh, 800 Algoma Boulevard, Oshkosh, Wisconsin 54902, United States
| | - Cesar Saucedo
- Department of Chemistry and Biochemistry, DePaul University, 1110 West Belden Avenue, Chicago, Illinois 60614, United States
| | - Patrick J. Carroll
- P. Roy and Diana T. Vagelos Laboratories, Department of Chemistry, University of Pennsylvania, 231 South 34th Street, Philadelphia, Pennsylvania 19104 United States
| | - Michael Gau
- P. Roy and Diana T. Vagelos Laboratories, Department of Chemistry, University of Pennsylvania, 231 South 34th Street, Philadelphia, Pennsylvania 19104 United States
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