A biomimetic model system for the water oxidizing triad in photosystem II

Ann Magnuson, Yves Frapart, Malin Abrahamsson, Olivier Horner, Björn Åkermark, Licheng Sun, Jean Jacques Girerd, Leif Hammarström, Stenbjörn Styring

Research output: Contribution to journalArticle

73 Citations (Scopus)

Abstract

In plants, solar energy is used to extract electrons from water, producing atmospheric oxygen. This is conducted by Photosystem II, where a redox 'triad' consisting of chlorophyll, a tyrosine, and a manganese cluster, governs an essential part of the process. Photooxidation of the chlorophylls produces electron transfer from the tyrosine, which forms a radical. The radical and the manganese cluster together extract electrons from water, providing the biosphere with an unlimited electron source. As a partial model for this system we constructed a ruthenium(II) complex with a covalently attached tyrosine, where the photooxidized ruthenium was rereduced by the tyrosine. In this study we show that the tyrosyl radical, which gives a transient EPR signal under illumination, can oxidize a manganese complex. The dinuclear manganese complex, which initially is in the Mn(III)/(III) state, is oxidized by the photogenerated tyrosyl radical to the Mn(III)/(IV) state. The redox potentials in our system are comparable to those in Photosystem II. Thus, our synthetic redox 'triad' mimics important elements in the electron donor 'triad' in Photosystem II, significantly advancing the development of systems for artificial photosynthesis based on ruthenium-manganese complexes.

Original languageEnglish
Pages (from-to)89-96
Number of pages8
JournalJournal of the American Chemical Society
Volume121
Issue number1
DOIs
Publication statusPublished - Jan 13 1999

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Biomimetics
Photosystem II Protein Complex
Manganese
Ruthenium
Tyrosine
Electrons
Water
Oxidation-Reduction
Chlorophyll
Solar Energy
Electron sources
Photooxidation
Photosynthesis
Lighting
Solar energy
Paramagnetic resonance
Oxygen

ASJC Scopus subject areas

  • Chemistry(all)

Cite this

Magnuson, A., Frapart, Y., Abrahamsson, M., Horner, O., Åkermark, B., Sun, L., ... Styring, S. (1999). A biomimetic model system for the water oxidizing triad in photosystem II. Journal of the American Chemical Society, 121(1), 89-96. https://doi.org/10.1021/ja981494r

A biomimetic model system for the water oxidizing triad in photosystem II. / Magnuson, Ann; Frapart, Yves; Abrahamsson, Malin; Horner, Olivier; Åkermark, Björn; Sun, Licheng; Girerd, Jean Jacques; Hammarström, Leif; Styring, Stenbjörn.

In: Journal of the American Chemical Society, Vol. 121, No. 1, 13.01.1999, p. 89-96.

Research output: Contribution to journalArticle

Magnuson, A, Frapart, Y, Abrahamsson, M, Horner, O, Åkermark, B, Sun, L, Girerd, JJ, Hammarström, L & Styring, S 1999, 'A biomimetic model system for the water oxidizing triad in photosystem II', Journal of the American Chemical Society, vol. 121, no. 1, pp. 89-96. https://doi.org/10.1021/ja981494r
Magnuson A, Frapart Y, Abrahamsson M, Horner O, Åkermark B, Sun L et al. A biomimetic model system for the water oxidizing triad in photosystem II. Journal of the American Chemical Society. 1999 Jan 13;121(1):89-96. https://doi.org/10.1021/ja981494r
Magnuson, Ann ; Frapart, Yves ; Abrahamsson, Malin ; Horner, Olivier ; Åkermark, Björn ; Sun, Licheng ; Girerd, Jean Jacques ; Hammarström, Leif ; Styring, Stenbjörn. / A biomimetic model system for the water oxidizing triad in photosystem II. In: Journal of the American Chemical Society. 1999 ; Vol. 121, No. 1. pp. 89-96.
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