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Light-Induced Activation of a Molybdenum Oxotransferase Model within a Ru(II)-Mo(VI) Dyad

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Light-Induced Activation of a Molybdenum Oxotransferase Model within a Ru(II)-Mo(VI) Dyad. / Ducrot, Aurélien B; Coulson, Ben A; Perutz, Robin N; Duhme-Klair, Anne-Kathrin.

In: Inorganic Chemistry, 19.12.2016, p. 12583−12594.

Research output: Contribution to journalArticle

Harvard

Ducrot, AB, Coulson, BA, Perutz, RN & Duhme-Klair, A-K 2016, 'Light-Induced Activation of a Molybdenum Oxotransferase Model within a Ru(II)-Mo(VI) Dyad', Inorganic Chemistry, pp. 12583−12594. https://doi.org/10.1021/acs.inorgchem.6b01485

APA

Ducrot, A. B., Coulson, B. A., Perutz, R. N., & Duhme-Klair, A-K. (2016). Light-Induced Activation of a Molybdenum Oxotransferase Model within a Ru(II)-Mo(VI) Dyad. Inorganic Chemistry, 12583−12594. [6b01485]. https://doi.org/10.1021/acs.inorgchem.6b01485

Vancouver

Ducrot AB, Coulson BA, Perutz RN, Duhme-Klair A-K. Light-Induced Activation of a Molybdenum Oxotransferase Model within a Ru(II)-Mo(VI) Dyad. Inorganic Chemistry. 2016 Dec 19;12583−12594. 6b01485. https://doi.org/10.1021/acs.inorgchem.6b01485

Author

Ducrot, Aurélien B ; Coulson, Ben A ; Perutz, Robin N ; Duhme-Klair, Anne-Kathrin. / Light-Induced Activation of a Molybdenum Oxotransferase Model within a Ru(II)-Mo(VI) Dyad. In: Inorganic Chemistry. 2016 ; pp. 12583−12594.

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@article{c10988e3f90546d48d592bc893309177,
title = "Light-Induced Activation of a Molybdenum Oxotransferase Model within a Ru(II)-Mo(VI) Dyad",
abstract = "Nature uses molybdenum-containing enzymes to catalyze oxygen atom transfer (OAT) from water to organic substrates. In these enzymes, the two electrons that are released during the reaction are rapidly removed, one at a time, by spatially separated electron transfer units. Inspired by this design, a Ru(II)-Mo(VI) dyad was synthesized and characterized, with the aim of accelerating the rate-determining step in the cis-dioxo molybdenum-catalyzed OAT cycle, the transfer of an oxo ligand to triphenyl phosphine, via a photo-oxidation process. The dyad consists of a photoactive bis(bipyridyl)-phenanthroline ruthenium moiety that is covalently linked to a bioinspired cis-dioxo molybdenum thiosemicarbazone complex. The quantum yield and luminescence lifetimes of the dyad [Ru(bpy)2(L(2))MoO2(solv)](2+) were determined. The major component of the luminescence decay in MeCN solution (τ = 1149 ± 2 ns, 67{\%}) corresponds closely to the lifetime of excited [Ru(bpy)2(phen-NH2)](2+), while the minor component (τ = 320 ± 1 ns, 31{\%}) matches that of [Ru(bpy)2(H2-L(2))](2+). In addition, the (spectro)electrochemical properties of the system were investigated. Catalytic tests showed that the dyad-catalyzed OAT from dimethyl sulfoxide to triphenyl phosphine proceeds significantly faster upon irradiation with visible light than in the dark. Methylviologen acts as a mediator in the photoredox cycle, but it is regenerated and hence only required in stoichiometric amounts with respect to the catalyst rather than sacrificial amounts. It is proposed that oxidative quenching of the photoexcited Ru unit, followed by intramolecular electron transfer, leads to the production of a reactive one-electron oxidized catalyst, which is not accessible by electrochemical methods. A significant, but less pronounced, rate enhancement was observed when an analogous bimolecular system was tested, indicating that intramolecular electron transfer between the photosensitizer and the catalytic center is more efficient than intermolecular electron transfer between the separate components.",
author = "Ducrot, {Aur{\'e}lien B} and Coulson, {Ben A} and Perutz, {Robin N} and Anne-Kathrin Duhme-Klair",
note = "{\circledC} 2016 American Chemical Society",
year = "2016",
month = "12",
day = "19",
doi = "10.1021/acs.inorgchem.6b01485",
language = "English",
pages = "12583−12594",
journal = "Inorganic Chemistry",
issn = "0020-1669",
publisher = "American Chemical Society",

}

RIS (suitable for import to EndNote) - Download

TY - JOUR

T1 - Light-Induced Activation of a Molybdenum Oxotransferase Model within a Ru(II)-Mo(VI) Dyad

AU - Ducrot, Aurélien B

AU - Coulson, Ben A

AU - Perutz, Robin N

AU - Duhme-Klair, Anne-Kathrin

N1 - © 2016 American Chemical Society

PY - 2016/12/19

Y1 - 2016/12/19

N2 - Nature uses molybdenum-containing enzymes to catalyze oxygen atom transfer (OAT) from water to organic substrates. In these enzymes, the two electrons that are released during the reaction are rapidly removed, one at a time, by spatially separated electron transfer units. Inspired by this design, a Ru(II)-Mo(VI) dyad was synthesized and characterized, with the aim of accelerating the rate-determining step in the cis-dioxo molybdenum-catalyzed OAT cycle, the transfer of an oxo ligand to triphenyl phosphine, via a photo-oxidation process. The dyad consists of a photoactive bis(bipyridyl)-phenanthroline ruthenium moiety that is covalently linked to a bioinspired cis-dioxo molybdenum thiosemicarbazone complex. The quantum yield and luminescence lifetimes of the dyad [Ru(bpy)2(L(2))MoO2(solv)](2+) were determined. The major component of the luminescence decay in MeCN solution (τ = 1149 ± 2 ns, 67%) corresponds closely to the lifetime of excited [Ru(bpy)2(phen-NH2)](2+), while the minor component (τ = 320 ± 1 ns, 31%) matches that of [Ru(bpy)2(H2-L(2))](2+). In addition, the (spectro)electrochemical properties of the system were investigated. Catalytic tests showed that the dyad-catalyzed OAT from dimethyl sulfoxide to triphenyl phosphine proceeds significantly faster upon irradiation with visible light than in the dark. Methylviologen acts as a mediator in the photoredox cycle, but it is regenerated and hence only required in stoichiometric amounts with respect to the catalyst rather than sacrificial amounts. It is proposed that oxidative quenching of the photoexcited Ru unit, followed by intramolecular electron transfer, leads to the production of a reactive one-electron oxidized catalyst, which is not accessible by electrochemical methods. A significant, but less pronounced, rate enhancement was observed when an analogous bimolecular system was tested, indicating that intramolecular electron transfer between the photosensitizer and the catalytic center is more efficient than intermolecular electron transfer between the separate components.

AB - Nature uses molybdenum-containing enzymes to catalyze oxygen atom transfer (OAT) from water to organic substrates. In these enzymes, the two electrons that are released during the reaction are rapidly removed, one at a time, by spatially separated electron transfer units. Inspired by this design, a Ru(II)-Mo(VI) dyad was synthesized and characterized, with the aim of accelerating the rate-determining step in the cis-dioxo molybdenum-catalyzed OAT cycle, the transfer of an oxo ligand to triphenyl phosphine, via a photo-oxidation process. The dyad consists of a photoactive bis(bipyridyl)-phenanthroline ruthenium moiety that is covalently linked to a bioinspired cis-dioxo molybdenum thiosemicarbazone complex. The quantum yield and luminescence lifetimes of the dyad [Ru(bpy)2(L(2))MoO2(solv)](2+) were determined. The major component of the luminescence decay in MeCN solution (τ = 1149 ± 2 ns, 67%) corresponds closely to the lifetime of excited [Ru(bpy)2(phen-NH2)](2+), while the minor component (τ = 320 ± 1 ns, 31%) matches that of [Ru(bpy)2(H2-L(2))](2+). In addition, the (spectro)electrochemical properties of the system were investigated. Catalytic tests showed that the dyad-catalyzed OAT from dimethyl sulfoxide to triphenyl phosphine proceeds significantly faster upon irradiation with visible light than in the dark. Methylviologen acts as a mediator in the photoredox cycle, but it is regenerated and hence only required in stoichiometric amounts with respect to the catalyst rather than sacrificial amounts. It is proposed that oxidative quenching of the photoexcited Ru unit, followed by intramolecular electron transfer, leads to the production of a reactive one-electron oxidized catalyst, which is not accessible by electrochemical methods. A significant, but less pronounced, rate enhancement was observed when an analogous bimolecular system was tested, indicating that intramolecular electron transfer between the photosensitizer and the catalytic center is more efficient than intermolecular electron transfer between the separate components.

U2 - 10.1021/acs.inorgchem.6b01485

DO - 10.1021/acs.inorgchem.6b01485

M3 - Article

SP - 12583−12594

JO - Inorganic Chemistry

JF - Inorganic Chemistry

SN - 0020-1669

M1 - 6b01485

ER -