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 language | English |
|---|---|
| Pages (from-to) | 25-40 |
| Number of pages | 16 |
| Journal | Photosynthesis Research |
| Volume | 87 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - Jan 2006 |
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ASJC Scopus subject areas
- Plant Science
Cite this
Mimicking the electron donor side of Photosystem II in artificial photosynthesis. / Lomoth, Reiner; Magnuson, Ann; Sjödin, Martin; Huang, Ping; Styring, Stenbjörn; Hammarström, Leif.
In: Photosynthesis Research, Vol. 87, No. 1, 01.2006, p. 25-40.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Mimicking the electron donor side of Photosystem II in artificial photosynthesis
AU - Lomoth, Reiner
AU - Magnuson, Ann
AU - Sjödin, Martin
AU - Huang, Ping
AU - Styring, Stenbjörn
AU - Hammarström, Leif
PY - 2006/1
Y1 - 2006/1
N2 - 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.
AB - 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.
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U2 - 10.1007/s11120-005-9005-0
DO - 10.1007/s11120-005-9005-0
M3 - Article
VL - 87
SP - 25
EP - 40
JO - Photosynthesis Research
JF - Photosynthesis Research
SN - 0166-8595
IS - 1
ER -