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Systematic Variation of 3d Metal Centers in a Redox-Innocent Ligand Environment: Structures, Electrochemical Properties, and Carbon Dioxide Activation

[Image: see text] Coordination compounds of earth-abundant 3d transition metals are among the most effective catalysts for the electrochemical reduction of carbon dioxide (CO(2)). While the properties of the metal center are crucial for the ability of the complexes to electrochemically activate CO(2...

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Autores principales: Kinzel, Niklas W., Demirbas, Derya, Bill, Eckhard, Weyhermüller, Thomas, Werlé, Christophe, Kaeffer, Nicolas, Leitner, Walter
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Chemical Society 2021
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8693193/
https://www.ncbi.nlm.nih.gov/pubmed/34851088
http://dx.doi.org/10.1021/acs.inorgchem.1c02909
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author Kinzel, Niklas W.
Demirbas, Derya
Bill, Eckhard
Weyhermüller, Thomas
Werlé, Christophe
Kaeffer, Nicolas
Leitner, Walter
author_facet Kinzel, Niklas W.
Demirbas, Derya
Bill, Eckhard
Weyhermüller, Thomas
Werlé, Christophe
Kaeffer, Nicolas
Leitner, Walter
author_sort Kinzel, Niklas W.
collection PubMed
description [Image: see text] Coordination compounds of earth-abundant 3d transition metals are among the most effective catalysts for the electrochemical reduction of carbon dioxide (CO(2)). While the properties of the metal center are crucial for the ability of the complexes to electrochemically activate CO(2), systematic variations of the metal within an identical, redox-innocent ligand backbone remain insufficiently investigated. Here, we report on the synthesis, structural and spectroscopic characterization, and electrochemical investigation of a series of 3d transition-metal complexes [M = Mn(I), Fe(II), Co(II), Ni(II), Cu(I), and Zn(II)] coordinated by a new redox-innocent PNP pincer ligand system. Only the Fe, Co, and Ni complexes reveal distinct metal-centered electrochemical reductions from M(II) down to M(0) and show indications for interaction with CO(2) in their reduced states. The Ni(0) d(10) species associates with CO(2) to form a putative Aresta-type Ni-η(2)-CO(2) complex, where electron transfer to CO(2) through back-bonding is insufficient to enable electrocatalytic activity. By contrast, the Co(0) d(9) intermediate binding CO(2) can undergo additional electron uptake into a formal cobalt(I) metallacarboxylate complex able to promote turnover. Our data, together with the few literature precedents, single out that an unsaturated coordination sphere (coordination number = 4 or 5) and a d(7)-to-d(9) configuration in the reduced low oxidation state (+I or 0) are characteristics that foster electrochemical CO(2) activation for complexes based on redox-innocent ligands.
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spelling pubmed-86931932021-12-22 Systematic Variation of 3d Metal Centers in a Redox-Innocent Ligand Environment: Structures, Electrochemical Properties, and Carbon Dioxide Activation Kinzel, Niklas W. Demirbas, Derya Bill, Eckhard Weyhermüller, Thomas Werlé, Christophe Kaeffer, Nicolas Leitner, Walter Inorg Chem [Image: see text] Coordination compounds of earth-abundant 3d transition metals are among the most effective catalysts for the electrochemical reduction of carbon dioxide (CO(2)). While the properties of the metal center are crucial for the ability of the complexes to electrochemically activate CO(2), systematic variations of the metal within an identical, redox-innocent ligand backbone remain insufficiently investigated. Here, we report on the synthesis, structural and spectroscopic characterization, and electrochemical investigation of a series of 3d transition-metal complexes [M = Mn(I), Fe(II), Co(II), Ni(II), Cu(I), and Zn(II)] coordinated by a new redox-innocent PNP pincer ligand system. Only the Fe, Co, and Ni complexes reveal distinct metal-centered electrochemical reductions from M(II) down to M(0) and show indications for interaction with CO(2) in their reduced states. The Ni(0) d(10) species associates with CO(2) to form a putative Aresta-type Ni-η(2)-CO(2) complex, where electron transfer to CO(2) through back-bonding is insufficient to enable electrocatalytic activity. By contrast, the Co(0) d(9) intermediate binding CO(2) can undergo additional electron uptake into a formal cobalt(I) metallacarboxylate complex able to promote turnover. Our data, together with the few literature precedents, single out that an unsaturated coordination sphere (coordination number = 4 or 5) and a d(7)-to-d(9) configuration in the reduced low oxidation state (+I or 0) are characteristics that foster electrochemical CO(2) activation for complexes based on redox-innocent ligands. American Chemical Society 2021-12-01 2021-12-20 /pmc/articles/PMC8693193/ /pubmed/34851088 http://dx.doi.org/10.1021/acs.inorgchem.1c02909 Text en © 2021 The Authors. Published by American Chemical Society https://creativecommons.org/licenses/by/4.0/Permits the broadest form of re-use including for commercial purposes, provided that author attribution and integrity are maintained (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Kinzel, Niklas W.
Demirbas, Derya
Bill, Eckhard
Weyhermüller, Thomas
Werlé, Christophe
Kaeffer, Nicolas
Leitner, Walter
Systematic Variation of 3d Metal Centers in a Redox-Innocent Ligand Environment: Structures, Electrochemical Properties, and Carbon Dioxide Activation
title Systematic Variation of 3d Metal Centers in a Redox-Innocent Ligand Environment: Structures, Electrochemical Properties, and Carbon Dioxide Activation
title_full Systematic Variation of 3d Metal Centers in a Redox-Innocent Ligand Environment: Structures, Electrochemical Properties, and Carbon Dioxide Activation
title_fullStr Systematic Variation of 3d Metal Centers in a Redox-Innocent Ligand Environment: Structures, Electrochemical Properties, and Carbon Dioxide Activation
title_full_unstemmed Systematic Variation of 3d Metal Centers in a Redox-Innocent Ligand Environment: Structures, Electrochemical Properties, and Carbon Dioxide Activation
title_short Systematic Variation of 3d Metal Centers in a Redox-Innocent Ligand Environment: Structures, Electrochemical Properties, and Carbon Dioxide Activation
title_sort systematic variation of 3d metal centers in a redox-innocent ligand environment: structures, electrochemical properties, and carbon dioxide activation
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8693193/
https://www.ncbi.nlm.nih.gov/pubmed/34851088
http://dx.doi.org/10.1021/acs.inorgchem.1c02909
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