Cargando…
Strong Ligand Stabilization Based on π‐Extension in a Series of Ruthenium Terpyridine Water Oxidation Catalysts
The substitution behavior of the monodentate Cl ligand of a series of ruthenium(II) terpyridine complexes (terpyridine (tpy)=2,2′:6′,2′′‐terpyridine) has been investigated. (1)H NMR kinetic experiments of the dissociation of the chloro ligand in D(2)O for the complexes [Ru(tpy)(bpy)Cl]Cl (1, bpy=2,2...
Autores principales: | , , , , , , , |
---|---|
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/PMC9299156/ https://www.ncbi.nlm.nih.gov/pubmed/34705303 http://dx.doi.org/10.1002/chem.202102905 |
_version_ | 1784750889484943360 |
---|---|
author | Amthor, Sebastian Hernández‐Castillo, David Maryasin, Boris Seeber, Phillip Mengele, Alexander K. Gräfe, Stefanie González, Leticia Rau, Sven |
author_facet | Amthor, Sebastian Hernández‐Castillo, David Maryasin, Boris Seeber, Phillip Mengele, Alexander K. Gräfe, Stefanie González, Leticia Rau, Sven |
author_sort | Amthor, Sebastian |
collection | PubMed |
description | The substitution behavior of the monodentate Cl ligand of a series of ruthenium(II) terpyridine complexes (terpyridine (tpy)=2,2′:6′,2′′‐terpyridine) has been investigated. (1)H NMR kinetic experiments of the dissociation of the chloro ligand in D(2)O for the complexes [Ru(tpy)(bpy)Cl]Cl (1, bpy=2,2’‐bipyridine) and [Ru(tpy)(dppz)Cl]Cl (2, dppz=dipyrido[3,2‐a:2′,3′‐c]phenazine) as well as the binuclear complex [Ru(bpy)(2)(tpphz)Ru(tpy)Cl]Cl(3) (3 b, tpphz=tetrapyrido[3,2‐a:2′,3′‐c:3′′,2′′‐h:2′′′,3′′′‐j]phenazine) were conducted, showing increased stability of the chloride ligand for compounds 2 and 3 due to the extended π‐system. Compounds 1–5 (4=[Ru(tbbpy)(2)(tpphz)Ru(tpy)Cl](PF(6))(3), 5=[Ru(bpy)(2)(tpphz)Ru(tpy)(C(3)H(8)OS)/(H(2)O)](PF(6))(3), tbbpy=4,4′‐di‐tert‐butyl‐2,2′‐bipyridine) are tested for their ability to run water oxidation catalysis (WOC) using cerium(IV) as sacrificial oxidant. The WOC experiments suggest that the stability of monodentate (chloride) ligand strongly correlates to catalytic performance, which follows the trend 1>2>5≥3>4. This is also substantiated by quantum chemical calculations, which indicate a stronger binding for the chloride ligand based on the extended π‐systems in compounds 2 and 3. Additionally, a theoretical model of the mechanism of the oxygen evolution of compounds 1 and 2 is presented; this suggests no differences in the elementary steps of the catalytic cycle within the bpy to the dppz complex, thus suggesting that differences in the catalytic performance are indeed based on ligand stability. Due to the presence of a photosensitizer and a catalytic unit, binuclear complexes 3 and 4 were tested for photocatalytic water oxidation. The bridging ligand architecture, however, inhibits the effective electron‐transfer cascade that would allow photocatalysis to run efficiently. The findings of this study can elucidate critical factors in catalyst design. |
format | Online Article Text |
id | pubmed-9299156 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2021 |
publisher | John Wiley and Sons Inc. |
record_format | MEDLINE/PubMed |
spelling | pubmed-92991562022-07-21 Strong Ligand Stabilization Based on π‐Extension in a Series of Ruthenium Terpyridine Water Oxidation Catalysts Amthor, Sebastian Hernández‐Castillo, David Maryasin, Boris Seeber, Phillip Mengele, Alexander K. Gräfe, Stefanie González, Leticia Rau, Sven Chemistry Full Papers The substitution behavior of the monodentate Cl ligand of a series of ruthenium(II) terpyridine complexes (terpyridine (tpy)=2,2′:6′,2′′‐terpyridine) has been investigated. (1)H NMR kinetic experiments of the dissociation of the chloro ligand in D(2)O for the complexes [Ru(tpy)(bpy)Cl]Cl (1, bpy=2,2’‐bipyridine) and [Ru(tpy)(dppz)Cl]Cl (2, dppz=dipyrido[3,2‐a:2′,3′‐c]phenazine) as well as the binuclear complex [Ru(bpy)(2)(tpphz)Ru(tpy)Cl]Cl(3) (3 b, tpphz=tetrapyrido[3,2‐a:2′,3′‐c:3′′,2′′‐h:2′′′,3′′′‐j]phenazine) were conducted, showing increased stability of the chloride ligand for compounds 2 and 3 due to the extended π‐system. Compounds 1–5 (4=[Ru(tbbpy)(2)(tpphz)Ru(tpy)Cl](PF(6))(3), 5=[Ru(bpy)(2)(tpphz)Ru(tpy)(C(3)H(8)OS)/(H(2)O)](PF(6))(3), tbbpy=4,4′‐di‐tert‐butyl‐2,2′‐bipyridine) are tested for their ability to run water oxidation catalysis (WOC) using cerium(IV) as sacrificial oxidant. The WOC experiments suggest that the stability of monodentate (chloride) ligand strongly correlates to catalytic performance, which follows the trend 1>2>5≥3>4. This is also substantiated by quantum chemical calculations, which indicate a stronger binding for the chloride ligand based on the extended π‐systems in compounds 2 and 3. Additionally, a theoretical model of the mechanism of the oxygen evolution of compounds 1 and 2 is presented; this suggests no differences in the elementary steps of the catalytic cycle within the bpy to the dppz complex, thus suggesting that differences in the catalytic performance are indeed based on ligand stability. Due to the presence of a photosensitizer and a catalytic unit, binuclear complexes 3 and 4 were tested for photocatalytic water oxidation. The bridging ligand architecture, however, inhibits the effective electron‐transfer cascade that would allow photocatalysis to run efficiently. The findings of this study can elucidate critical factors in catalyst design. John Wiley and Sons Inc. 2021-11-11 2021-12-06 /pmc/articles/PMC9299156/ /pubmed/34705303 http://dx.doi.org/10.1002/chem.202102905 Text en © 2021 The Authors. Chemistry - A European Journal 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 | Full Papers Amthor, Sebastian Hernández‐Castillo, David Maryasin, Boris Seeber, Phillip Mengele, Alexander K. Gräfe, Stefanie González, Leticia Rau, Sven Strong Ligand Stabilization Based on π‐Extension in a Series of Ruthenium Terpyridine Water Oxidation Catalysts |
title | Strong Ligand Stabilization Based on π‐Extension in a Series of Ruthenium Terpyridine Water Oxidation Catalysts |
title_full | Strong Ligand Stabilization Based on π‐Extension in a Series of Ruthenium Terpyridine Water Oxidation Catalysts |
title_fullStr | Strong Ligand Stabilization Based on π‐Extension in a Series of Ruthenium Terpyridine Water Oxidation Catalysts |
title_full_unstemmed | Strong Ligand Stabilization Based on π‐Extension in a Series of Ruthenium Terpyridine Water Oxidation Catalysts |
title_short | Strong Ligand Stabilization Based on π‐Extension in a Series of Ruthenium Terpyridine Water Oxidation Catalysts |
title_sort | strong ligand stabilization based on π‐extension in a series of ruthenium terpyridine water oxidation catalysts |
topic | Full Papers |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9299156/ https://www.ncbi.nlm.nih.gov/pubmed/34705303 http://dx.doi.org/10.1002/chem.202102905 |
work_keys_str_mv | AT amthorsebastian strongligandstabilizationbasedonpextensioninaseriesofrutheniumterpyridinewateroxidationcatalysts AT hernandezcastillodavid strongligandstabilizationbasedonpextensioninaseriesofrutheniumterpyridinewateroxidationcatalysts AT maryasinboris strongligandstabilizationbasedonpextensioninaseriesofrutheniumterpyridinewateroxidationcatalysts AT seeberphillip strongligandstabilizationbasedonpextensioninaseriesofrutheniumterpyridinewateroxidationcatalysts AT mengelealexanderk strongligandstabilizationbasedonpextensioninaseriesofrutheniumterpyridinewateroxidationcatalysts AT grafestefanie strongligandstabilizationbasedonpextensioninaseriesofrutheniumterpyridinewateroxidationcatalysts AT gonzalezleticia strongligandstabilizationbasedonpextensioninaseriesofrutheniumterpyridinewateroxidationcatalysts AT rausven strongligandstabilizationbasedonpextensioninaseriesofrutheniumterpyridinewateroxidationcatalysts |