1
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Cohen KY, Nedd DG, Evans R, Bocarsly AB. Mechanistic insights into CO 2 conversion to CO using cyano manganese complexes. Dalton Trans 2023. [PMID: 37183860 DOI: 10.1039/d3dt00891f] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
Without the use of a photosensitizer, [Mn(bpy)(CO)3(CN)] (MnCN) can photochemically form [Mn(bpy)(CO)3]-, the active species for CO2 reduction. While cases of the axial X-ligand dissociating upon irradiation of fac-[M(N-N)(CO)3X] complexes (M = Mn or Re; N-N = bipyridine (bpy) ligand; X = halogen or pseudohalogen) are well documented, the axial cyanide ligand is retained when either [Mn(bpy)(CO)3(CN)] or [Mn(mesbpy)(CO)3(CN)], MnCN(mesbpy), are irradiated anaerobically. Infrared and UV-vis spectroscopies indicate the formation of [Mn(bpy)(CO)2(MeCN)(CN)] (s-MnCN) as the primary product during the irradiation of MnCN. An in-depth analysis of the photochemical mechanism for the formation of [Mn(bpy)(CO)3]- from MnCN is presented. MnCN(mesbpy) is too sterically hindered to undergo the same photochemical mechanism as MnCN. However, MnCN(mesbpy) is found to be electrocatalytically active for CO2 reduction to CO. Thus providing an interesting distinction between photochemical and electrochemical charge transfer.
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Affiliation(s)
- Kailyn Y Cohen
- Department of Chemistry, Frick Laboratory, Princeton University, Princeton, New Jersey, USA.
| | - Delaan G Nedd
- Department of Chemistry, Frick Laboratory, Princeton University, Princeton, New Jersey, USA.
| | - Rebecca Evans
- Department of Chemistry, Frick Laboratory, Princeton University, Princeton, New Jersey, USA.
| | - Andrew B Bocarsly
- Department of Chemistry, Frick Laboratory, Princeton University, Princeton, New Jersey, USA.
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2
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N-heterocyclic carbene-pyridine ligand coordinated Mo(II) complexes catalyzed synthesis of cyclic carbonates from carbon dioxide and epoxides. J CO2 UTIL 2023. [DOI: 10.1016/j.jcou.2022.102384] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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3
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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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4
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Scherpf T, Carr CR, Donnelly LJ, Dubrawski ZS, Gelfand BS, Piers WE. A Mesoionic Carbene-Pyridine Bidentate Ligand That Improves Stability in Electrocatalytic CO 2 Reduction by a Molecular Manganese Catalyst. Inorg Chem 2022; 61:13644-13656. [PMID: 35981323 DOI: 10.1021/acs.inorgchem.2c02689] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Tricarbonyl Group 7 complexes have a longstanding history as efficacious CO2 electroreduction catalysts. Typically, these complexes feature an auxiliary 2,2'-bipyridine ligand that assists in redox steps by delocalizing the electron density into the ligand orbitals. While this feature lends to an accessible redox potential for CO2 electroreduction, it also presents challenges for electrocatalysis with Mn because the electron density is removed from metal-ligand bonding orbitals. The results presented here thus introduce a mesoionic carbene (MIC) as a potent ligand platform to promote Mn-based electrocatalysis. The strong σ donation of the N,C-bidentate MIC is shown to help centralize the electron density on the Mn center while also maintaining relevant redox potentials for CO2 electroreduction. Mechanistic investigation supports catalytic turnover at two operative potentials separated by 400 mV. In the low operating potential regime at -1.54 V, Mn(0) species catalyze CO2 to CO and CO32-, which has a maximum rate of 7 ± 5 s-1 and is stable for up to 30.7 h. At higher operating potential at -1.94 V, "Mn(-1)" catalyzes CO2 to CO and H2O with faster turnovers of 200 ± 100 s-1, with the trade-off being less stability at 6.7 h. The relative stabilities of Mn complexes bearing MIC and 4,4'-di-tert-butyl-2,2'-bipyridine were compared by evaluation under the same electrolysis conditions and therefore elucidated that the MIC promotes longevity for CO evolution throughout a 5 h period.
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Affiliation(s)
- Thorsten Scherpf
- Department of Chemistry, University of Calgary, 2500 University Drive N.W., Calgary, Alberta T2N 1N4, Canada
| | - Cody R Carr
- Department of Chemistry, University of Calgary, 2500 University Drive N.W., Calgary, Alberta T2N 1N4, Canada
| | - Laurie J Donnelly
- Department of Chemistry, University of Calgary, 2500 University Drive N.W., Calgary, Alberta T2N 1N4, Canada
| | - Zachary S Dubrawski
- Department of Chemistry, University of Calgary, 2500 University Drive N.W., Calgary, Alberta T2N 1N4, Canada
| | - Benjamin S Gelfand
- Department of Chemistry, University of Calgary, 2500 University Drive N.W., Calgary, Alberta T2N 1N4, Canada
| | - Warren E Piers
- Department of Chemistry, University of Calgary, 2500 University Drive N.W., Calgary, Alberta T2N 1N4, Canada
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5
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Cohen KY, Evans R, Dulovic S, Bocarsly AB. Using Light and Electrons to Bend Carbon Dioxide: Developing and Understanding Catalysts for CO 2 Conversion to Fuels and Feedstocks. Acc Chem Res 2022; 55:944-954. [PMID: 35290017 DOI: 10.1021/acs.accounts.1c00643] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Our global society generates an unwieldy amount of CO2 per unit time. Therefore, the capture of this greenhouse gas must involve a diverse set of strategies. One solution to this problem is the conversion of CO2 into a more useful chemical species. Again, a multiplicity of syntheses and products will be necessary. No matter how elegant the chemistry is, commercial markets often have little use for a small set of compounds made in tremendous yield. Following this reasoning, the Bocarsly Research Group seeks to develop new electrochemical and photochemical processes that may be of utility in the conversion of CO2 to organic compounds. We focus on investigating proton-coupled charge transfer mechanisms that produce both C1 and carbon-carbon bonded products (C2+).In early work, we considered the reduction of CO2 to formate at electrocatalytic indium and tin electrodes. These studies demonstrated the key role of surface oxides in catalyzing the reduction of CO2. This work generated efficient systems for the formation of formate and paved the way to studies using non-copper, intermetallic electrocatalysts for the generation of C2+ species. Most notable is the efficient formation of oxalate at an oxidized Cr3Ga electrode. Oxalate has recently been suggested as a potential nonfossil, alternate organic feedstock.Separately, we have focused on the electrocatalytic effects of pyridine on the reduction of CO2 in aqueous electrolyte. These studies demonstrated that electrodes that normally yield a low hydrogen overpotential (Pd and Pt) show suppressed H2 evolution and strongly enhanced activity for CO2 reduction in the presence of pyridinium. Methanol was observed to form in high Faradaic yield at low overpotential using this system. The 6-electron, 6-proton reduction of CO2 in the presence of pyridinium was intriguing, and significant effort was placed on understanding the mechanism of this reaction both on metal electrodes and on semiconducting photocathodes. P-GaP electrodes were found to provide exceptional behavior for the formation of methanol using only light as the energy source.The pyridinium studies highlighted the role of protons in the overall reduction of CO2, stimulating our interest in the chemistry of MnBr(bpy)(CO)3 and related compounds. This complex was reported to electrochemically reduce CO2 to CO. We saw these reports as an opportunity to study the detailed nature of the proton-coupled electron transfer (PCET) mechanism associated with CO2 reduction. Our investigation of this system revealed the role of hydrogen-bonding in CO2 reduction and pointed the way for the construction of a photochemical process for CO generation using a [(bpy)(CO)3Mn(CN)Mn(bpy)(CO)3]+ photocatalyst.Based on our studies to date, it appears likely that heterogeneous systems can be assembled to convert CO2 into products that are "beyond C2 products." This may open up new practical chemistry in the area of fossil-based replacements for both synthesis and fuels. Systems with pragmatic efficiencies are close to reality. Electrochemical reactors using heterogeneous electrocatalysts show the stability and product selectivity needed to generate industrial opportunities. Continued growth of mechanistic understanding is expected to facilitate the chemical design of cogent systems for the taming of CO2.
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Affiliation(s)
- Kailyn Y. Cohen
- Frick Laboratory, Department of Chemistry, Princeton University, Princeton, New Jersey 08544, United States
| | - Rebecca Evans
- Frick Laboratory, Department of Chemistry, Princeton University, Princeton, New Jersey 08544, United States
| | - Stephanie Dulovic
- Frick Laboratory, Department of Chemistry, Princeton University, Princeton, New Jersey 08544, United States
| | - Andrew B. Bocarsly
- Frick Laboratory, Department of Chemistry, Princeton University, Princeton, New Jersey 08544, United States
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6
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Tang M, Cameron L, Poland EM, Yu LJ, Moggach SA, Fuller RO, Huang H, Sun J, Thickett SC, Massi M, Coote ML, Ho CC, Bissember AC. Photoactive Metal Carbonyl Complexes Bearing N-Heterocyclic Carbene Ligands: Synthesis, Characterization, and Viability as Photoredox Catalysts. Inorg Chem 2022; 61:1888-1898. [PMID: 35025492 DOI: 10.1021/acs.inorgchem.1c02964] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
This report details the synthesis and characterization of a small family of previously unreported, structurally related chromium, molybdenum, tungsten, manganese, and iron complexes bearing N-heterocyclic carbene and carbonyl supporting ligands. These complexes have the general form [ML(CO)3X] or [ML(CO)3], where X = CO or Br and L = 1-phenyl-3-(2-pyridyl)imidazolin-2-ylidene. Where possible, the solid-state, spectroscopic, electrochemical, and photophysical properties of these molecules were studied using a combination of experiment and theory. Photophysical studies reveal that decarbonylation occurs when these complexes are exposed to ultraviolet light, with the CO ligand being replaced with a labile acetonitrile solvent molecule. To obtain insights into the potential utility, scope, and applications of these complexes in visible-light-mediated photoredox catalysis, their capacity to facilitate a range of photoinduced reactions via the reductive or oxidative functionalization of organic molecules was investigated. These chromium, molybdenum, and manganese catalysts efficiently facilitated atom-transfer radical addition processes. In light of their photolability, these types of catalysts may potentially allow for the development of photoinduced reactions involving less conventional inner-sphere electron-transfer pathways.
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Affiliation(s)
- Meiqiong Tang
- School of Natural Sciences-Chemistry, University of Tasmania (UTAS), Hobart, Tasmania7001, Australia
| | - Lee Cameron
- School of Molecular and Life Sciences, Curtin University, Perth, Western Australia6102, Australia
| | - Eve M Poland
- School of Natural Sciences-Chemistry, University of Tasmania (UTAS), Hobart, Tasmania7001, Australia
| | - Li-Juan Yu
- Research School of Chemistry, Australian National University, Canberra, Australian Capital Territory2601, Australia
| | - Stephen A Moggach
- School of Molecular Sciences, University of Western Australia, Perth, Western Australia6009, Australia
| | - Rebecca O Fuller
- School of Natural Sciences-Chemistry, University of Tasmania (UTAS), Hobart, Tasmania7001, Australia
| | - Hai Huang
- Jiangsu Key Laboratory of Advanced Catalytic Materials & Technology, School of Petrochemical Engineering, Changzhou University, Changzhou213164, China
| | - Jianwei Sun
- Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, SAR, China
| | - Stuart C Thickett
- School of Natural Sciences-Chemistry, University of Tasmania (UTAS), Hobart, Tasmania7001, Australia
| | - Massimiliano Massi
- School of Molecular and Life Sciences, Curtin University, Perth, Western Australia6102, Australia
| | - Michelle L Coote
- Research School of Chemistry, Australian National University, Canberra, Australian Capital Territory2601, Australia
| | - Curtis C Ho
- School of Natural Sciences-Chemistry, University of Tasmania (UTAS), Hobart, Tasmania7001, Australia
| | - Alex C Bissember
- School of Natural Sciences-Chemistry, University of Tasmania (UTAS), Hobart, Tasmania7001, Australia
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7
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Friães S, Realista S, Mourão H, Royo B. N‐Heterocyclic and Mesoionic Carbenes of Manganese and Rhenium in Catalysis. Eur J Inorg Chem 2022. [DOI: 10.1002/ejic.202100884] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
| | | | | | - Beatriz Royo
- Universidade Nova de Lisboa Instituto de Tecnologia Quimica e Biologica ITQB NOVA, Instituto de Tecnologia Química e Biológica António Xavier Av. da República 2780-157 Oeiras PORTUGAL
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8
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Highly active electrocatalytic CO2 reduction with manganese N-heterocyclic carbene pincer by para electronic tuning. CHINESE CHEM LETT 2022. [DOI: 10.1016/j.cclet.2021.06.046] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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9
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Friães S, Realista S, Gomes CSB, Martinho PN, Royo B. Click-Derived Triazoles and Triazolylidenes of Manganese for Electrocatalytic Reduction of CO 2. Molecules 2021; 26:molecules26216325. [PMID: 34770734 PMCID: PMC8588546 DOI: 10.3390/molecules26216325] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2021] [Revised: 10/14/2021] [Accepted: 10/16/2021] [Indexed: 11/16/2022] Open
Abstract
A series of new fac-[Mn(L)(CO)3Br] complexes where L is a bidentate chelating ligand containing mixed mesoionic triazolylidene-pyridine (MIC^py, 1), triazolylidene-triazole (MIC^trz, 2), and triazole-pyridine (trz^py, 3) ligands have been prepared and fully characterized, including the single crystal X-ray diffraction studies of 1 and 2. The abilities of 1–3 and complex fac-[Mn(MIC^MIC)(CO)3Br] (4) to catalyze the electroreduction of CO2 has been assessed for the first time. It was found that all complexes displayed a current increase under CO2 atmosphere, being 3 and 4 the most active complexes. Complex 3, bearing a N^N-based ligand exhibited a good efficiency and an excellent selectivity for reducing CO2 to CO in the presence of 1.0 M of water, at low overpotential. Interestingly, complex 4 containing the strongly electron donating di-imidazolylidene ligand exhibited comparable activity to 3, when the experiments were performed in neat acetonitrile at slightly higher overpotential (−1.86 vs. −2.14 V).
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Affiliation(s)
- Sofia Friães
- ITQB NOVA, Instituto de Tecnologia Química e Biológica António Xavier, Av. da República, 2780-157 Oeiras, Portugal; (S.F.); (S.R.)
| | - Sara Realista
- ITQB NOVA, Instituto de Tecnologia Química e Biológica António Xavier, Av. da República, 2780-157 Oeiras, Portugal; (S.F.); (S.R.)
| | - Clara S. B. Gomes
- LAQV-REQUIMTE, Department of Chemistry, Campus de Caparica, NOVA School of Science and Technology, NOVA University Lisbon, 2829-516 Caparica, Portugal;
- Associated Laboratory i4HB-Institute for Health and Bioeconomy, School of Science and Technology, NOVA University Lisbon, 2829-516 Caparica, Portugal
- UCIBIO-Applied Molecular Biosciences Unit, Department of Chemistry, School of Science and Technology, NOVA University Lisbon, 2829-516 Caparica, Portugal
| | - Paulo N. Martinho
- Biosystems and Integrative Sciences Institute (BioISI), Faculdade de Ciências, Campo Grande, Universidade de Lisboa, 1749-016 Lisboa, Portugal;
- Centro de Química Estrutural, Campo Grande, Faculdade de Ciências Universidade de Lisboa, 1749-016 Lisboa, Portugal
| | - Beatriz Royo
- ITQB NOVA, Instituto de Tecnologia Química e Biológica António Xavier, Av. da República, 2780-157 Oeiras, Portugal; (S.F.); (S.R.)
- Correspondence:
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10
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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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11
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12
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Huang C, Liu J, Huang HH, Ke Z. Recent progress in electro- and photo-catalytic CO2 reduction using N-heterocyclic carbene transition metal complexes. Polyhedron 2021. [DOI: 10.1016/j.poly.2021.115147] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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13
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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: 109] [Impact Index Per Article: 36.3] [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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14
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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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15
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Fu Z, Wang X, Tao S, Bu Q, Wei D, Liu N. Manganese Catalyzed Direct Amidation of Esters with Amines. J Org Chem 2021; 86:2339-2358. [DOI: 10.1021/acs.joc.0c02478] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Zhengqiang Fu
- School of Chemistry and Chemical Engineering, Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan, Shihezi University, North Fourth Road, Shihezi, Xinjiang 832003, People’s Republic of China
| | - Xinghua Wang
- College of Chemistry, Center of Computational Chemistry, Zhengzhou University, Zhengzhou 450001, People’s Republic of China
| | - Sheng Tao
- School of Chemistry and Chemical Engineering, Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan, Shihezi University, North Fourth Road, Shihezi, Xinjiang 832003, People’s Republic of China
| | - Qingqing Bu
- School of Chemistry and Chemical Engineering, Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan, Shihezi University, North Fourth Road, Shihezi, Xinjiang 832003, People’s Republic of China
| | - Donghui Wei
- College of Chemistry, Center of Computational Chemistry, Zhengzhou University, Zhengzhou 450001, People’s Republic of China
| | - Ning Liu
- School of Chemistry and Chemical Engineering, Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan, Shihezi University, North Fourth Road, Shihezi, Xinjiang 832003, People’s Republic of China
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16
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Mandal SC, Pathak B. Computational insights into electrocatalytic CO2 reduction facilitated by Mn(I) half sandwich-based catalysts: Role of substitution and solvent. Electrochim Acta 2021. [DOI: 10.1016/j.electacta.2020.137463] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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17
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Romain C, Bellemin-Laponnaz S, Dagorne S. Recent progress on NHC-stabilized early transition metal (group 3–7) complexes: Synthesis and applications. Coord Chem Rev 2020. [DOI: 10.1016/j.ccr.2020.213411] [Citation(s) in RCA: 33] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
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18
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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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19
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Yang Y, Zhang Z, Chang X, Zhang YQ, Liao RZ, Duan L. Highly Active Manganese-Based CO 2 Reduction Catalysts with Bulky NHC Ligands: A Mechanistic Study. Inorg Chem 2020; 59:10234-10242. [PMID: 32585094 DOI: 10.1021/acs.inorgchem.0c01364] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Because of the strong σ-donor and weak π-acceptor of the N-heterocyclic carbene (NHC), Mn-NHC complexes were found to be active for the reduction of CO2 to CO with high activity. However, some NHC-based manganese complexes showed low catalytic activity and required very negative potentials. We report herein that complex fac-[MnI(bis-MesNHC)(CO)3Br] [1; bis-MesNHC = 3,3-bis(2,4,6-trimethylphenyl)-(1,1'-diimidazolin-2,2'-diylidene)methane] could catalyze the electrochemical reduction of CO2 to CO with high activity (TOFmax = 3180 ± 6 s-1) at a less negative potential. Due to the introduction of the bulky Mes groups, a one-electron-reduced intermediate {[Mn0(bis-MesNHC)(CO)3]0 (2•)} was isolated as a packed "dimer" and crystallographically characterized. Stopped-flow Fourier-transform infrared spectroscopy was used to prove the direct reaction between doubly reduced intermediate fac-[Mn(bis-MesNHC)(CO)3]- and CO2; the tetracarbonyl Mn complex [Mn+(bis-MesNHC)(CO)4]+ ([2-CO]+) was captured, and its further reduction proposed as the rate-limiting step.
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Affiliation(s)
- Yong Yang
- Department of Chemistry, Southern University of Science and Technology (SUSTech), Shenzhen 518055, P. R. China
| | - Zhenyu Zhang
- Department of Chemistry, Southern University of Science and Technology (SUSTech), Shenzhen 518055, P. R. China
| | - Xiaoyong Chang
- Department of Chemistry, Southern University of Science and Technology (SUSTech), Shenzhen 518055, P. R. China
| | - Ya-Qiong Zhang
- Key Laboratory of Material Chemistry for Energy Conversion and Storage, Ministry of Education, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, P. R. China
| | - Rong-Zhen Liao
- Key Laboratory of Material Chemistry for Energy Conversion and Storage, Ministry of Education, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, P. R. China
| | - Lele Duan
- Department of Chemistry, Southern University of Science and Technology (SUSTech), Shenzhen 518055, P. R. China.,Shenzhen Grubbs Institute and Guangdong Provincial Key Laboratory of Energy Materials for Electric Power, Southern University of Science and Technology (SUSTech), Shenzhen 518055, P. R. China
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20
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Henke WC, Otolski CJ, Moore WNG, Elles CG, Blakemore JD. Ultrafast Spectroscopy of [Mn(CO) 3] Complexes: Tuning the Kinetics of Light-Driven CO Release and Solvent Binding. Inorg Chem 2020; 59:2178-2187. [PMID: 31990533 DOI: 10.1021/acs.inorgchem.9b02758] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Manganese tricarbonyl complexes are promising catalysts for CO2 reduction, but complexes in this family are often photosensitive and decompose rapidly upon exposure to visible light. In this report, synthetic and photochemical studies probe the initial steps of light-driven speciation for Mn(CO)3(Rbpy)Br complexes bearing a range of 4,4'-disubstituted 2,2'-bipyridyl ligands (Rbpy, where R = tBu, H, CF3, NO2). Transient absorption spectroscopy measurements for Mn(CO)3(Rbpy)Br coordination compounds with R = tBu, H, and CF3 in acetonitrile reveal ultrafast loss of a CO ligand on the femtosecond time scale, followed by solvent coordination on the picosecond time scale. The Mn(CO)3(NO2bpy)Br complex is unique among the four compounds in having a longer-lived excited state that does not undergo CO release or subsequent solvent coordination. The kinetics of photolysis and solvent coordination for light-sensitive complexes depend on the electronic properties of the disubstituted bipyridyl ligand. The results indicate that both metal-to-ligand charge-transfer (MLCT) and dissociative ligand-field (d-d) excited states play a role in the ultrafast photochemistry. Taken together, the findings suggest that more robust catalysts could be prepared with appropriately designed complexes that avoid crossing between the excited states that drive photochemical CO loss.
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Affiliation(s)
- Wade C Henke
- Department of Chemistry , University of Kansas , 1567 Irving Hill Road , Lawrence , Kansas 66045-7582 , United States
| | - Christopher J Otolski
- Department of Chemistry , University of Kansas , 1567 Irving Hill Road , Lawrence , Kansas 66045-7582 , United States
| | - William N G Moore
- Department of Chemistry , University of Kansas , 1567 Irving Hill Road , Lawrence , Kansas 66045-7582 , United States
| | - Christopher G Elles
- Department of Chemistry , University of Kansas , 1567 Irving Hill Road , Lawrence , Kansas 66045-7582 , United States
| | - James D Blakemore
- Department of Chemistry , University of Kansas , 1567 Irving Hill Road , Lawrence , Kansas 66045-7582 , United States
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21
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Kuo HY, Tignor SE, Lee TS, Ni D, Park JE, Scholes GD, Bocarsly AB. Reduction-induced CO dissociation by a [Mn(bpy)(CO) 4][SbF 6] complex and its relevance in electrocatalytic CO 2 reduction. Dalton Trans 2020; 49:891-900. [PMID: 31859334 DOI: 10.1039/c9dt04150h] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
[Mn(bpy)(CO)3Br] is recognized as a benchmark electrocatalyst for CO2 reduction to CO, with the doubly reduced [Mn(bpy)(CO)3]- proposed to be the active species in the catalytic mechanism. The reaction of this intermediate with CO2 and two protons is expected to produce the tetracarbonyl cation, [Mn(bpy)(CO)4]+, thereby closing the catalytic cycle. However, this species has not been experimentally observed. In this study, [Mn(bpy)(CO)4][SbF6] (1) was directly synthesized and found to be an efficient electrocatalyst for the reduction of CO2 to CO in the presence of H2O. Complex 1 was characterized using X-ray crystallography as well as IR and UV-Vis spectroscopy. The redox activity of 1 was determined using cyclic voltammetry and compared with that of benchmark manganese complexes, e.g., [Mn(bpy)(CO)3Br] (2) and [Mn(bpy)(CO)3(MeCN)][PF6] (3). Infrared spectroscopic analyses indicated that CO dissociation occurs after a single-electron reduction of complex 1, producing a [Mn(bpy)(CO)3(MeCN)]+ species. Complex 1 was experimentally verified as both a precatalyst and an on-cycle intermediate in homogeneous Mn-based electrocatalytic CO2 reduction.
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Affiliation(s)
- Hsin-Ya Kuo
- Department of Chemistry, Princeton University, Princeton, New Jersey 08544, USA.
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22
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Farahmand S, Ghiaci M, Vatanparast M, Razavizadeh JS. One-step hydroxylation of benzene to phenol over Schiff base complexes incorporated onto mesoporous organosilica in the presence of different axial ligands. NEW J CHEM 2020. [DOI: 10.1039/d0nj00928h] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Liquid-phase hydroxylation of benzene to phenol using Schiff base complexes anchored on a mesoporous organosilica support was investigated in various solvents when molecular oxygen was utilized as a green oxidant.
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Affiliation(s)
| | - Mehran Ghiaci
- Department of Chemistry
- Isfahan University of Technology
- Isfahan
- Iran
| | - Morteza Vatanparast
- Department of Chemistry
- Amirkabir University of Technology
- Tehran Polytechnic
- Tehran
- Iran
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23
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Kurtz DA, Dhakal B, McDonald LT, Nichol GS, Felton GAN. Inter-ligand intramolecular through-space anisotropic shielding in a series of manganese carbonyl phosphorous compounds. Dalton Trans 2019; 48:14926-14935. [PMID: 31559411 DOI: 10.1039/c9dt03100f] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Eight novel manganese carbonyl complexes of the type [Mn(bpy-tBu)(CO)3PR3]+ (bpy-tBu = 4,4'-di-tert-butyl-2,2'-bipyridine; R = Cy, nBu, Me, p-tol, Ph, p-F-Ph, OEt, and OMe), have been synthesized and characterized by 1H NMR, FTIR, UV/Vis, HRMS and CV. X-ray crystallographic structures of [Mn(bpy-tBu)(CO)3(PCy3)]+ and [Mn(bpy-tBu)(CO)3(PPh3)]+ were obtained. The short Mn-P bond length allows for close proximity of the bipyridine ligand and the phosphine R groups, resulting in strong anisotropic shielding of certain bipyridine protons by aryl R groups (reordering the bipyridine 1H NMR pattern in the most extreme case). Electrochemical analysis of the compound series reveals that while each is a competent precatalyst for electrochemical carbon dioxide reduction (to carbon monoxide), the lability of the PR3 ligand results in similar catalytic performance amongst the series.
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Affiliation(s)
- Daniel A Kurtz
- Rowland Institute at Harvard, Harvard University, Cambridge, MA 02142, USA
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24
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Matson BD, McLoughlin EA, Armstrong KC, Waymouth RM, Sarangi R. Effect of Redox Active Ligands on the Electrochemical Properties of Manganese Tricarbonyl Complexes. Inorg Chem 2019; 58:7453-7465. [PMID: 31117629 DOI: 10.1021/acs.inorgchem.9b00652] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The synthesis, structural characterization, and electrochemical behavior of the neutral Mn(azpy)(CO)3(Br) 4 (azpy = 2-phenylazopyridine) complex is reported and compared with its structural analogue Mn(bipy)(CO)3(Br) 1 (bipy = 2,2'-bipyridine). 4 exhibits reversible two-electron reduction at a mild potential (-0.93 V vs Fc+/0 in acetonitrile) in contrast to 1, which exhibits two sequential one-electron reductions at -1.68 V and -1.89 V vs Fc+/0 in acetonitrile. The key electronic structure differences between 1 and 4 that lead to disparate electrochemical properties are investigated using a combination of Mn-K-edge X-ray absorption spectroscopy (XAS), Mn-Kβ X-ray emission spectroscopy (XES), and density functional theory (DFT) on 1, 4, their debrominated analogues, [Mn(L)(CO)3(CH3CN)][CF3SO3] (L = bipy 2, azpy 5), and two-electron reduced counterparts [Mn(bipy)(CO)3][K(18-crown-6)] 3 and [Mn(azpy)(CO)3][Cp2Co] 6. The results reveal differences in the distribution of electrons about the CO and bidentate ligands (bipy and azpy), particularly upon formation of the highly reduced, formally Mn(-1) species. The data show that the degree of ligand noninnocence and resulting redox-activity in Mn(L)(CO)3 type complexes impacts not only the reducing power of such systems, but the speciation of the reduced complexes via perturbation of the monomer-dimer equilibrium in the singly reduced Mn(0) state. This study highlights the role of redox-active ligands in tuning the reactivity of metal centers involved in electrocatalytic transformations.
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Affiliation(s)
- Benjamin D Matson
- Department of Chemistry , Stanford University , Stanford , California 94305 , United States.,Stanford Synchrotron Radiation Lightsource , SLAC National Accelerator Laboratory , Menlo Park , California , United States
| | - Elizabeth A McLoughlin
- Department of Chemistry , Stanford University , Stanford , California 94305 , United States
| | - Keith C Armstrong
- Department of Chemistry , Stanford University , Stanford , California 94305 , United States
| | - Robert M Waymouth
- Department of Chemistry , Stanford University , Stanford , California 94305 , United States
| | - Ritimukta Sarangi
- Stanford Synchrotron Radiation Lightsource , SLAC National Accelerator Laboratory , Menlo Park , California , United States
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25
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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: 391] [Impact Index Per Article: 78.2] [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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26
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Tignor SE, Shaw TW, Bocarsly AB. Elucidating the origins of enhanced CO2 reduction in manganese electrocatalysts bearing pendant hydrogen-bond donors. Dalton Trans 2019; 48:12730-12737. [DOI: 10.1039/c9dt02060h] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A mechanistic analysis showing the critical importance of an intramolecular hydrogen bond for improved insight and understanding in CO2 electroreduction.
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27
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Wang X, Ma H, Meng C, Chen D, Huang F. A rational design of manganese electrocatalysts for Lewis acid-assisted carbon dioxide reduction. Phys Chem Chem Phys 2019; 21:8849-8855. [PMID: 30977486 DOI: 10.1039/c9cp00514e] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Herein, the mechanisms of Brønsted acid- and Lewis acid-assisted CO2 electroreduction by Mn(mesbpy)(CO)3Br (1) were investigated by density functional theory calculations. Our results indicate that for the Lewis acid-assisted cycle, an energy sink (13) is present owing to the interaction between Mg(OTf)2 and activated CO2, which is disadvantageous to the apparent activation energy (ΔG≠). Moreover, a series of substituted 13 counterparts were investigated to reduce the energy sink and decrease ΔG≠. Based on our study on the substituent effect, an excellent linear relationship was found between 2e reduction potentials and LUMO energies of substituted 1, and a moderate linear relationship was observed between ΔG of substituted 13 and the 2e reduction potential of substituted 1 counterparts. Moreover, for the CO2 reduction assisted by a Lewis acid, the formyl-substituted complex R8 has been predicted to be a more effective catalyst with lower overpotential and higher catalytic activity than its parent complex 1.
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Affiliation(s)
- Xiaoli Wang
- College of Chemistry, Chemical Engineering and Materials Science, Key Laboratory of Molecular and Nano Probes, Ministry of Education, Collaborative Innovation Center of Functionalized Probes for Chemical Imaging in Universities of Shandong, Institute of Molecular and Nano Science, Shandong Normal University, Jinan, 250014, P. R. China.
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28
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Kuo HY, Lee TS, Chu AT, Tignor SE, Scholes GD, Bocarsly AB. A cyanide-bridged di-manganese carbonyl complex that photochemically reduces CO2 to CO. Dalton Trans 2019; 48:1226-1236. [DOI: 10.1039/c8dt03358g] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A cyanide-bridged di-manganese complex, {[Mn(bpy)(CO)3]2(μ-CN)}+, is introduced as an efficient electrocatalyst and photochemically active for proton-assisted of CO2 reduction to CO.
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Affiliation(s)
- Hsin-Ya Kuo
- Princeton University
- Department of Chemistry
- Princeton
- USA
| | - Tia S. Lee
- Princeton University
- Department of Chemistry
- Princeton
- USA
| | - An T. Chu
- Princeton University
- Department of Chemistry
- Princeton
- USA
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29
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Takeda H, Kamiyama H, Okamoto K, Irimajiri M, Mizutani T, Koike K, Sekine A, Ishitani O. Highly Efficient and Robust Photocatalytic Systems for CO2 Reduction Consisting of a Cu(I) Photosensitizer and Mn(I) Catalysts. J Am Chem Soc 2018; 140:17241-17254. [DOI: 10.1021/jacs.8b10619] [Citation(s) in RCA: 98] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Hiroyuki Takeda
- Department of Chemistry, School of Science, Tokyo Institute of Technology, 2-12-1-NE-1 O-okayama, Meguro-ku, Tokyo 152-8550, Japan
| | - Hiroko Kamiyama
- Department of Chemistry, School of Science, Tokyo Institute of Technology, 2-12-1-NE-1 O-okayama, Meguro-ku, Tokyo 152-8550, Japan
| | - Kouhei Okamoto
- Department of Chemistry, School of Science, Tokyo Institute of Technology, 2-12-1-NE-1 O-okayama, Meguro-ku, Tokyo 152-8550, Japan
| | - Mina Irimajiri
- Department of Chemistry, School of Science, Tokyo Institute of Technology, 2-12-1-NE-1 O-okayama, Meguro-ku, Tokyo 152-8550, Japan
| | - Toshihide Mizutani
- Department of Chemistry, School of Science, Tokyo Institute of Technology, 2-12-1-NE-1 O-okayama, Meguro-ku, Tokyo 152-8550, Japan
| | - Kazuhide Koike
- National Institute of Advanced Industrial Science and Technology, Onogawa 16-1, Tsukuba 305-8569, Japan
| | - Akiko Sekine
- Department of Chemistry, School of Science, Tokyo Institute of Technology, 2-12-1-NE-1 O-okayama, Meguro-ku, Tokyo 152-8550, Japan
| | - Osamu Ishitani
- Department of Chemistry, School of Science, Tokyo Institute of Technology, 2-12-1-NE-1 O-okayama, Meguro-ku, Tokyo 152-8550, Japan
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30
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Grills DC, Ertem MZ, McKinnon M, Ngo KT, Rochford J. Mechanistic aspects of CO2 reduction catalysis with manganese-based molecular catalysts. Coord Chem Rev 2018. [DOI: 10.1016/j.ccr.2018.05.022] [Citation(s) in RCA: 75] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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31
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Tignor SE, Kuo HY, Lee TS, Scholes GD, Bocarsly AB. Manganese-Based Catalysts with Varying Ligand Substituents for the Electrochemical Reduction of CO2 to CO. Organometallics 2018. [DOI: 10.1021/acs.organomet.8b00554] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Steven E. Tignor
- Department of Chemistry, Princeton University, Princeton, New Jersey 08544, United States
| | - Hsin-Ya Kuo
- Department of Chemistry, Princeton University, Princeton, New Jersey 08544, United States
| | - Tia S. Lee
- Department of Chemistry, Princeton University, Princeton, New Jersey 08544, United States
| | - Gregory D. Scholes
- Department of Chemistry, Princeton University, Princeton, New Jersey 08544, United States
| | - Andrew B. Bocarsly
- Department of Chemistry, Princeton University, Princeton, New Jersey 08544, United States
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32
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Walsh JJ, Neri G, Smith CL, Cowan AJ. Water-Soluble Manganese Complex for Selective Electrocatalytic CO2 Reduction to CO. Organometallics 2018. [DOI: 10.1021/acs.organomet.8b00336] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
| | - Gaia Neri
- Department of Chemistry, Stephenson Institute for Renewable Energy, The University of Liverpool, Liverpool L69 7ZF, United Kingdom
| | - Charlotte L. Smith
- Department of Chemistry, Stephenson Institute for Renewable Energy, The University of Liverpool, Liverpool L69 7ZF, United Kingdom
| | - Alexander J. Cowan
- Department of Chemistry, Stephenson Institute for Renewable Energy, The University of Liverpool, Liverpool L69 7ZF, United Kingdom
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33
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Hu P, Yin L, Kirchon A, Li J, Li B, Wang Z, Ouyang Z, Zhang T, Zhou HC. Magnetic Metal–Organic Framework Exhibiting Quick and Selective Solvatochromic Behavior along with Reversible Crystal-to-Amorphous-to-Crystal Transformation. Inorg Chem 2018; 57:7006-7014. [DOI: 10.1021/acs.inorgchem.8b00703] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Peng Hu
- Key laboratory of Material Chemistry for Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan, Hubei 430074, People’s Republic of China
| | - Lei Yin
- Wuhan National High Magnetic Field Centre & School of Physics, Huazhong University of Science and Technology, Wuhan, Hubei 430074, People’s Republic of China
| | - Angelo Kirchon
- Department of Chemistry, Department of Materials Science and Engineering, Texas A&M Energy Institute, Texas A&M University, College Station, Texas 77843-3255, United States
| | - Jiangli Li
- Key laboratory of Material Chemistry for Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan, Hubei 430074, People’s Republic of China
| | - Bao Li
- Key laboratory of Material Chemistry for Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan, Hubei 430074, People’s Republic of China
| | - Zhenxing Wang
- Wuhan National High Magnetic Field Centre & School of Physics, Huazhong University of Science and Technology, Wuhan, Hubei 430074, People’s Republic of China
| | - Zhongwen Ouyang
- Wuhan National High Magnetic Field Centre & School of Physics, Huazhong University of Science and Technology, Wuhan, Hubei 430074, People’s Republic of China
| | - Tianle Zhang
- Key laboratory of Material Chemistry for Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan, Hubei 430074, People’s Republic of China
| | - Hong-cai Zhou
- Department of Chemistry, Department of Materials Science and Engineering, Texas A&M Energy Institute, Texas A&M University, College Station, Texas 77843-3255, United States
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34
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35
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Franco F, Pinto MF, Royo B, Lloret‐Fillol J. A Highly Active N-Heterocyclic Carbene Manganese(I) Complex for Selective Electrocatalytic CO 2 Reduction to CO. Angew Chem Int Ed Engl 2018; 57:4603-4606. [PMID: 29481726 PMCID: PMC5947128 DOI: 10.1002/anie.201800705] [Citation(s) in RCA: 78] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2018] [Indexed: 12/19/2022]
Abstract
We report here the first purely organometallic fac-[MnI (CO)3 (bis-Me NHC)Br] complex with unprecedented activity for the selective electrocatalytic reduction of CO2 to CO, exceeding 100 turnovers with excellent faradaic yields (ηCO ≈95 %) in anhydrous CH3 CN. Under the same conditions, a maximum turnover frequency (TOFmax ) of 2100 s-1 was measured by cyclic voltammetry, which clearly exceeds the values reported for other manganese-based catalysts. Moreover, the addition of water leads to the highest TOFmax value (ca. 320 000 s-1 ) ever reported for a manganese-based catalyst. A MnI tetracarbonyl intermediate was detected under catalytic conditions for the first time.
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Affiliation(s)
- Federico Franco
- Institute of Chemical Research of Catalonia (ICIQ)The Barcelona Institute of Science and TechnologyAvinguda Països Catalans 1643007TarragonaSpain
| | - Mara F. Pinto
- Instituto de Tecnologia Química e Biológica António Xavier (ITQB)Nova University of LisbonAv. da República2780-157OeirasPortugal
| | - Beatriz Royo
- Instituto de Tecnologia Química e Biológica António Xavier (ITQB)Nova University of LisbonAv. da República2780-157OeirasPortugal
| | - Julio Lloret‐Fillol
- Institute of Chemical Research of Catalonia (ICIQ)The Barcelona Institute of Science and TechnologyAvinguda Països Catalans 1643007TarragonaSpain
- Catalan Institution for Research and Advanced Studies (ICREA)Passeig Lluïs Companys, 2308010BarcelonaSpain
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36
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Stanbury M, Compain JD, Chardon-Noblat S. Electro and photoreduction of CO 2 driven by manganese-carbonyl molecular catalysts. Coord Chem Rev 2018. [DOI: 10.1016/j.ccr.2018.01.014] [Citation(s) in RCA: 42] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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37
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Franco F, Pinto MF, Royo B, Lloret‐Fillol J. A Highly Active N‐Heterocyclic Carbene Manganese(I) Complex for Selective Electrocatalytic CO
2
Reduction to CO. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201800705] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Federico Franco
- Institute of Chemical Research of Catalonia (ICIQ) The Barcelona Institute of Science and Technology Avinguda Països Catalans 16 43007 Tarragona Spain
| | - Mara F. Pinto
- Instituto de Tecnologia Química e Biológica António Xavier (ITQB) Nova University of Lisbon Av. da República 2780-157 Oeiras Portugal
| | - Beatriz Royo
- Instituto de Tecnologia Química e Biológica António Xavier (ITQB) Nova University of Lisbon Av. da República 2780-157 Oeiras Portugal
| | - Julio Lloret‐Fillol
- Institute of Chemical Research of Catalonia (ICIQ) The Barcelona Institute of Science and Technology Avinguda Països Catalans 16 43007 Tarragona Spain
- Catalan Institution for Research and Advanced Studies (ICREA) Passeig Lluïs Companys, 23 08010 Barcelona Spain
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38
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Walsh JJ, Forster M, Smith CL, Neri G, Potter RJ, Cowan AJ. Directing the mechanism of CO 2 reduction by a Mn catalyst through surface immobilization. Phys Chem Chem Phys 2018; 20:6811-6816. [PMID: 29480315 DOI: 10.1039/c7cp08537k] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Immobilization of a Mn polypyridyl CO2 reduction electrocatalyst on nanocrystalline TiO2 electrodes yields an active heterogeneous system and also significantly triggers a change in voltammetric and catalytic behaviour, relative to in solution. A combination of spectroelectrochemical techniques are presented here to elucidate the mechanism of the immobilized catalyst in situ.
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Affiliation(s)
- James J Walsh
- School of Chemical Sciences, Dublin City University, Glasnevin, Dublin 9, Ireland.
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39
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Affiliation(s)
- Jonathon E. Vandezande
- Center for Computational
Quantum Chemistry, University of Georgia, Athens, Georgia 30602, United States
| | - Henry F. Schaefer
- Center for Computational
Quantum Chemistry, University of Georgia, Athens, Georgia 30602, United States
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40
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Francke R, Schille B, Roemelt M. Homogeneously Catalyzed Electroreduction of Carbon Dioxide-Methods, Mechanisms, and Catalysts. Chem Rev 2018; 118:4631-4701. [PMID: 29319300 DOI: 10.1021/acs.chemrev.7b00459] [Citation(s) in RCA: 587] [Impact Index Per Article: 97.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
The utilization of CO2 via electrochemical reduction constitutes a promising approach toward production of value-added chemicals or fuels using intermittent renewable energy sources. For this purpose, molecular electrocatalysts are frequently studied and the recent progress both in tuning of the catalytic properties and in mechanistic understanding is truly remarkable. While in earlier years research efforts were focused on complexes with rare metal centers such as Re, Ru, and Pd, the focus has recently shifted toward earth-abundant transition metals such as Mn, Fe, Co, and Ni. By application of appropriate ligands, these metals have been rendered more than competitive for CO2 reduction compared to the heavier homologues. In addition, the important roles of the second and outer coordination spheres in the catalytic processes have become apparent, and metal-ligand cooperativity has recently become a well-established tool for further tuning of the catalytic behavior. Surprising advances have also been made with very simple organocatalysts, although the mechanisms behind their reactivity are not yet entirely understood. Herein, the developments of the last three decades in electrocatalytic CO2 reduction with homogeneous catalysts are reviewed. A discussion of the underlying mechanistic principles is included along with a treatment of the experimental and computational techniques for mechanistic studies and catalyst benchmarking. Important catalyst families are discussed in detail with regard to mechanistic aspects, and recent advances in the field are highlighted.
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Affiliation(s)
- Robert Francke
- Institute of Chemistry , Rostock University , Albert-Einstein-Strasse 3a , 18059 Rostock , Germany
| | - Benjamin Schille
- Institute of Chemistry , Rostock University , Albert-Einstein-Strasse 3a , 18059 Rostock , Germany
| | - Michael Roemelt
- Lehrstuhl für Theoretische Chemie , Ruhr-University Bochum , 44780 Bochum , Germany.,Max-Planck Institut für Kohlenforschung , Kaiser-Wilhelm Platz 1 , 45470 Mülheim an der Ruhr , Germany
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41
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Gonell S, Miller AJ. Carbon Dioxide Electroreduction Catalyzed by Organometallic Complexes. ADVANCES IN ORGANOMETALLIC CHEMISTRY 2018. [DOI: 10.1016/bs.adomc.2018.07.001] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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42
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43
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Yempally V, Moncho S, Hasanayn F, Fan WY, Brothers EN, Bengali AA. Ancillary Ligand Effects upon the Photochemistry of Mn(bpy)(CO)3X Complexes (X = Br–, PhCC–). Inorg Chem 2017; 56:11244-11253. [DOI: 10.1021/acs.inorgchem.7b01543] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
| | - Salvador Moncho
- Department of Chemistry, Texas A&M University at Qatar, Doha, Qatar
| | - Faraj Hasanayn
- Department of Chemistry, American University of Beirut, Beirut, Lebanon
| | - Wai Yip Fan
- Department of Chemistry, National University of Singapore, Kent Ridge, Singapore 117543
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44
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Stanbury M, Compain JD, Trejo M, Smith P, Gouré E, Chardon-Noblat S. Mn-carbonyl molecular catalysts containing a redox-active phenanthroline-5,6-dione for selective electro- and photoreduction of CO2 to CO or HCOOH. Electrochim Acta 2017. [DOI: 10.1016/j.electacta.2017.04.080] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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45
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Takeda H, Cometto C, Ishitani O, Robert M. Electrons, Photons, Protons and Earth-Abundant Metal Complexes for Molecular Catalysis of CO2 Reduction. ACS Catal 2016. [DOI: 10.1021/acscatal.6b02181] [Citation(s) in RCA: 455] [Impact Index Per Article: 56.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Hiroyuki Takeda
- Department
of Chemistry, Faculty of Science, Tokyo Institute of Technology, 2-12-1, NE-1 O-okayama, Meguro-ku, Tokyo, 152-8550, Japan
| | - Claudio Cometto
- Université
Paris Diderot, Sorbonne Paris Cité, Laboratoire d’Electrochimie
Moléculaire, Unité Mixte de Recherche Université−CNRS
no. 7591, Bâtiment Lavoisier,
15 rue Jean de Baïf, 75205 CEDEX
13 Paris, France
| | - Osamu Ishitani
- Department
of Chemistry, Faculty of Science, Tokyo Institute of Technology, 2-12-1, NE-1 O-okayama, Meguro-ku, Tokyo, 152-8550, Japan
| | - Marc Robert
- Université
Paris Diderot, Sorbonne Paris Cité, Laboratoire d’Electrochimie
Moléculaire, Unité Mixte de Recherche Université−CNRS
no. 7591, Bâtiment Lavoisier,
15 rue Jean de Baïf, 75205 CEDEX
13 Paris, France
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46
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Agnew DW, Sampson MD, Moore CE, Rheingold AL, Kubiak CP, Figueroa JS. Electrochemical Properties and CO 2-Reduction Ability of m-Terphenyl Isocyanide Supported Manganese Tricarbonyl Complexes. Inorg Chem 2016; 55:12400-12408. [PMID: 27934438 DOI: 10.1021/acs.inorgchem.6b02299] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
To circumvent complications with redox-active ligands commonly encountered in the study of manganese electrocatalysts for CO2 reduction, we have studied the electrochemistry of the manganese mixed carbonyl/isocyanide complexes XMn(CO)3(CNArDipp2)2 (X = counteranion), to evaluate the pairing effects of the counteranion and their influence over the potential necessary for metal-based reduction. The complexes described herein have been shown to act as functional analogues to the known homoleptic carbonyl manganese complexes [Mn(CO)5]n (n = 1-, 0, 1+). The m-terphenyl isocyanide ligand CNArDipp2 improves the kinetic stability of the resulting mixed carbonyl/isocyanide systems, such that conversion among all three oxidation states is easily effected by chemical reagents. Here, we have utilized an electrochemical study to fully understand the redox chemistry of this system and its ability to facilitate CO2 reduction and to provide comparison to known manganese-based CO2 electrocatalysts. Two complexes, BrMn(CO)3(CNArDipp2)2 and [Mn(THF)(CO)3(CNArDipp2)2]OTf, have been studied using infrared spectroelectrochemistry (IR-SEC) to spectroscopically characterize the redox states of these complexes during the course of electrochemical reactions. A striking difference in the necessary potential leading to the first one-electron reduction has been found for the halide and triflate species, respectively. Complete selectivity for the formation of CO and CO32- is observed in the reactivity of [Mn(CO)3(CNArDipp2)2]- with CO2, which is deduced via the trapping and incorporation of liberated CO into the zerovalent species Mn(CO)3(CNArDipp2)2 to form the dimers Mn2(CO)7(CNArDipp2)3 and Mn2(CO)8(CNArDipp2)2.
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Affiliation(s)
- Douglas W Agnew
- Department of Chemistry and Biochemistry, University of California, San Diego , 9500 Gilman Drive, Mail Code 0358, La Jolla, California 92093, United States
| | - Matthew D Sampson
- Department of Chemistry and Biochemistry, University of California, San Diego , 9500 Gilman Drive, Mail Code 0358, La Jolla, California 92093, United States
| | - Curtis E Moore
- Department of Chemistry and Biochemistry, University of California, San Diego , 9500 Gilman Drive, Mail Code 0358, La Jolla, California 92093, United States
| | - Arnold L Rheingold
- Department of Chemistry and Biochemistry, University of California, San Diego , 9500 Gilman Drive, Mail Code 0358, La Jolla, California 92093, United States
| | - Clifford P Kubiak
- Department of Chemistry and Biochemistry, University of California, San Diego , 9500 Gilman Drive, Mail Code 0358, La Jolla, California 92093, United States
| | - Joshua S Figueroa
- Department of Chemistry and Biochemistry, University of California, San Diego , 9500 Gilman Drive, Mail Code 0358, La Jolla, California 92093, United States
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47
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Stanton CJ, Vandezande JE, Majetich GF, Schaefer HF, Agarwal J. Mn-NHC Electrocatalysts: Increasing π Acidity Lowers the Reduction Potential and Increases the Turnover Frequency for CO 2 Reduction. Inorg Chem 2016; 55:9509-9512. [PMID: 27636737 DOI: 10.1021/acs.inorgchem.6b01657] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
A new manganese(I) N-heterocyclic carbene electrocatalyst containing a benzimidazole-pyrimidine-based ligand is reported for the two-electron conversion of CO2. The increased π acidity of pyrimidine shifts the two-electron reduction to -1.77 V vs Fc/Fc+, 70 mV more positive than that for MnBr(2,2'-bipyridine)(CO)3; increased catalytic current enhancement is also observed (5.2× vs 2.1×). Theoretical analyses suggest that this heightened activity may follow from the preference for a reduction-first dehydroxylation mechanism.
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Affiliation(s)
- Charles J Stanton
- Department of Chemistry and ‡Center for Computational Quantum Chemistry, University of Georgia , Athens, Georgia 30602, United States
| | - Jonathon E Vandezande
- Department of Chemistry and ‡Center for Computational Quantum Chemistry, University of Georgia , Athens, Georgia 30602, United States
| | - George F Majetich
- Department of Chemistry and ‡Center for Computational Quantum Chemistry, University of Georgia , Athens, Georgia 30602, United States
| | - Henry F Schaefer
- Department of Chemistry and ‡Center for Computational Quantum Chemistry, University of Georgia , Athens, Georgia 30602, United States
| | - Jay Agarwal
- Department of Chemistry and ‡Center for Computational Quantum Chemistry, University of Georgia , Athens, Georgia 30602, United States
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48
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Rosser TE, Windle CD, Reisner E. Electrocatalytic and Solar-Driven CO2 Reduction to CO with a Molecular Manganese Catalyst Immobilized on Mesoporous TiO2. Angew Chem Int Ed Engl 2016; 55:7388-92. [PMID: 27110904 PMCID: PMC5074277 DOI: 10.1002/anie.201601038] [Citation(s) in RCA: 88] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2016] [Indexed: 12/13/2022]
Abstract
Electrocatalytic CO2 reduction to CO was achieved with a novel Mn complex, fac-[MnBr(4,4'-bis(phosphonic acid)-2,2'-bipyridine)(CO)3 ] (MnP), immobilized on a mesoporous TiO2 electrode. A benchmark turnover number of 112±17 was attained with these TiO2 |MnP electrodes after 2 h electrolysis. Post-catalysis IR spectroscopy demonstrated that the molecular structure of the MnP catalyst was retained. UV/vis spectroscopy confirmed that an active Mn-Mn dimer was formed during catalysis on the TiO2 electrode, showing the dynamic formation of a catalytically active dimer on an electrode surface. Finally, we combined the light-protected TiO2 |MnP cathode with a CdS-sensitized photoanode to enable solar-light-driven CO2 reduction with the light-sensitive MnP catalyst.
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Affiliation(s)
- Timothy E Rosser
- Christian Doppler Laboratory for Sustainable SynGas Chemistry, Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, UK
| | - Christopher D Windle
- Christian Doppler Laboratory for Sustainable SynGas Chemistry, Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, UK
| | - Erwin Reisner
- Christian Doppler Laboratory for Sustainable SynGas Chemistry, Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, UK.
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49
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Rao GK, Pell W, Korobkov I, Richeson D. Electrocatalytic reduction of CO2 using Mn complexes with unconventional coordination environments. Chem Commun (Camb) 2016; 52:8010-3. [PMID: 27264057 DOI: 10.1039/c6cc03827a] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
New complexes, Mn{κ(3)-[2,6-{Ph2PNMe}2(NC5H3)]}(CO)3(+)Br(-) (1(+)Br(-)) and MnBr{κ(2)-(Ph2P)NMe(NC5H4)}(CO)3 (2), are reported and present new ligand environments for CO2 electrocatalytic reduction to CO. Compound 1(+) presents a unique metal geometry for CO production (96%) in the absence of added water while 2 required addition of water and generated both CO and H2 products.
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Affiliation(s)
- Gyandshwar Kumar Rao
- Department of Chemistry and Biomolecular Sciences and the Center for Catalysis and Research Innovation, University of Ottawa, 10 Marie Curie, Ottawa, ON K1N6N5, Canada.
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50
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Rosser TE, Windle CD, Reisner E. Electrocatalytic and Solar-Driven CO2
Reduction to CO with a Molecular Manganese Catalyst Immobilized on Mesoporous TiO2. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201601038] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Timothy E. Rosser
- Christian Doppler Laboratory for Sustainable SynGas Chemistry; Department of Chemistry; University of Cambridge; Lensfield Road Cambridge CB2 1EW UK
| | - Christopher D. Windle
- Christian Doppler Laboratory for Sustainable SynGas Chemistry; Department of Chemistry; University of Cambridge; Lensfield Road Cambridge CB2 1EW UK
| | - Erwin Reisner
- Christian Doppler Laboratory for Sustainable SynGas Chemistry; Department of Chemistry; University of Cambridge; Lensfield Road Cambridge CB2 1EW UK
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