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
N1 - Funding Information:
All present and past collaboration partners and coworkers of the Swedish Consortium for Artificial Photosynthesis are gratefully acknowledged, in particular Björn Åkermark and Licheng Sun (Stockholm) for synthetic work and a long-standing collaboration. This work was financed by The Swedish Energy Agency, The Knut and Alice Wallenberg Foundation, The Swedish Research Council, The Royal Swedish Academy of Sciences, The Swedish Foundation for Strategic Research, DESS and NEST-STRP ‘SOLAR-H’ (EU contract no 516510).
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 2II,II to Mn2III,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 2II,II to Mn2III,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 - Review article
C2 - 16416050
AN - SCOPUS:33646575321
VL - 87
SP - 25
EP - 40
JO - Photosynthesis Research
JF - Photosynthesis Research
SN - 0166-8595
IS - 1
ER -