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Off‐Set Interactions of Ruthenium–bda Type Catalysts for Promoting Water‐Splitting Performance

O−O bond formation with Ru(bda)L(2)‐type catalysts is well‐known to proceed through a bimolecular reaction pathway, limiting the potential application of these catalysts at low concentrations. Herein, we achieved high efficiencies with mononuclear catalysts, with TOFs of 460±32 s(−1) at high catalys...

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Autores principales: Timmer, Brian J. J., Kravchenko, Oleksandr, Liu, Tianqi, Zhang, Biaobiao, Sun, Licheng
Formato: Online Artículo Texto
Lenguaje:English
Publicado: John Wiley and Sons Inc. 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8251529/
https://www.ncbi.nlm.nih.gov/pubmed/33861495
http://dx.doi.org/10.1002/anie.202101931
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author Timmer, Brian J. J.
Kravchenko, Oleksandr
Liu, Tianqi
Zhang, Biaobiao
Sun, Licheng
author_facet Timmer, Brian J. J.
Kravchenko, Oleksandr
Liu, Tianqi
Zhang, Biaobiao
Sun, Licheng
author_sort Timmer, Brian J. J.
collection PubMed
description O−O bond formation with Ru(bda)L(2)‐type catalysts is well‐known to proceed through a bimolecular reaction pathway, limiting the potential application of these catalysts at low concentrations. Herein, we achieved high efficiencies with mononuclear catalysts, with TOFs of 460±32 s(−1) at high catalyst loading and 31±3 s(−1) at only 1 μM catalyst concentration, by simple structural considerations on the axial ligands. Kinetic and DFT studies show that introduction of an off‐set in the interaction between the two catalytic units reduces the kinetic barrier of the second‐order O−O bond formation, maintaining high catalytic activity even at low catalyst concentrations. The results herein furthermore suggest that π–π interactions may only play a minor role in the observed catalytic activity, and that asymmetry can also rationalize high activity observed for Ru(bda)(isoq)(2) type catalysts and offer inspiration to overcome the limitations of 2nd order catalysis.
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spelling pubmed-82515292021-07-06 Off‐Set Interactions of Ruthenium–bda Type Catalysts for Promoting Water‐Splitting Performance Timmer, Brian J. J. Kravchenko, Oleksandr Liu, Tianqi Zhang, Biaobiao Sun, Licheng Angew Chem Int Ed Engl Research Articles O−O bond formation with Ru(bda)L(2)‐type catalysts is well‐known to proceed through a bimolecular reaction pathway, limiting the potential application of these catalysts at low concentrations. Herein, we achieved high efficiencies with mononuclear catalysts, with TOFs of 460±32 s(−1) at high catalyst loading and 31±3 s(−1) at only 1 μM catalyst concentration, by simple structural considerations on the axial ligands. Kinetic and DFT studies show that introduction of an off‐set in the interaction between the two catalytic units reduces the kinetic barrier of the second‐order O−O bond formation, maintaining high catalytic activity even at low catalyst concentrations. The results herein furthermore suggest that π–π interactions may only play a minor role in the observed catalytic activity, and that asymmetry can also rationalize high activity observed for Ru(bda)(isoq)(2) type catalysts and offer inspiration to overcome the limitations of 2nd order catalysis. John Wiley and Sons Inc. 2021-05-19 2021-06-21 /pmc/articles/PMC8251529/ /pubmed/33861495 http://dx.doi.org/10.1002/anie.202101931 Text en © 2021 The Authors. Angewandte Chemie International Edition published by Wiley-VCH GmbH https://creativecommons.org/licenses/by/4.0/This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
spellingShingle Research Articles
Timmer, Brian J. J.
Kravchenko, Oleksandr
Liu, Tianqi
Zhang, Biaobiao
Sun, Licheng
Off‐Set Interactions of Ruthenium–bda Type Catalysts for Promoting Water‐Splitting Performance
title Off‐Set Interactions of Ruthenium–bda Type Catalysts for Promoting Water‐Splitting Performance
title_full Off‐Set Interactions of Ruthenium–bda Type Catalysts for Promoting Water‐Splitting Performance
title_fullStr Off‐Set Interactions of Ruthenium–bda Type Catalysts for Promoting Water‐Splitting Performance
title_full_unstemmed Off‐Set Interactions of Ruthenium–bda Type Catalysts for Promoting Water‐Splitting Performance
title_short Off‐Set Interactions of Ruthenium–bda Type Catalysts for Promoting Water‐Splitting Performance
title_sort off‐set interactions of ruthenium–bda type catalysts for promoting water‐splitting performance
topic Research Articles
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8251529/
https://www.ncbi.nlm.nih.gov/pubmed/33861495
http://dx.doi.org/10.1002/anie.202101931
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