Mimicking the electron donor side of Photosystem II in artificial photosynthesis

Reiner Lomoth, Ann Magnuson, Martin Sjödin, Ping Huang, Stenbjörn Styring, Leif Hammarström

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Abstract

This review focuses on our recent efforts in synthetic ruthenium-tyrosine- manganese chemistry mimicking the donor side reactions of Photosystem II. Tyrosine and tryptophan residues were linked to ruthenium photosensitizers, which resulted in model complexes for proton-coupled electron transfer from amino acids. A new mechanistic model was proposed and used to design complexes in which the mechanism could be switched between concerted and step-wise proton-coupled electron transfer. Moreover, a manganese dimer linked to a ruthenium complex could be oxidized in three successive steps, from Mn 2 II,II to Mn2 III,IV by the photo-oxidized ruthenium sensitizer. This was possible thanks to a charge compensating ligand exchange in the manganese complex. Detailed studies of the ligand exchange suggested that at high water concentrations, each oxidation step is coupled to a proton-release of water-derived ligands, analogous to the oxidation steps of the manganese cluster of Photosystem II.

Original languageEnglish
Pages (from-to)25-40
Number of pages16
JournalPhotosynthesis Research
Volume87
Issue number1
DOIs
Publication statusPublished - 2006 Jan
Externally publishedYes

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ASJC Scopus subject areas

  • Plant Science

Cite this

Lomoth, R., Magnuson, A., Sjödin, M., Huang, P., Styring, S., & Hammarström, L. (2006). Mimicking the electron donor side of Photosystem II in artificial photosynthesis. Photosynthesis Research, 87(1), 25-40. https://doi.org/10.1007/s11120-005-9005-0