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Coupled electron tr...
Coupled electron transfers in artificial photosynthesis
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- Hammarström, Leif (författare)
- Uppsala universitet,Institutionen för fotokemi och molekylärvetenskap
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- Styring, Stenbjörn (författare)
- Uppsala universitet,Institutionen för fotokemi och molekylärvetenskap
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(creator_code:org_t)
- 2007-10-18
- 2008
- Engelska.
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Ingår i: Philosophical Transactions of the Royal Society of London. Biological Sciences. - : The Royal Society. - 0962-8436 .- 1471-2970. ; 363:1494, s. 1283-1291
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Abstract
Ämnesord
Stäng
- Light-induced charge separation in molecular assemblies has been widely investigated in the context of artificial photosynthesis. Important progress has been made in the fundamental understanding of electron and energy transfer and in stabilizing charge separation by multi-step electron transfer. In the Swedish Consortium for Artificial Photosynthesis, we build on principles from the natural enzyme photosystem II and Fe-hydrogenases. An important theme in this biomimetic effort is that of coupled electron-transfer reactions, which have so far received only little attention. (i) Each absorbed photon leads to charge separation on a single-electron level only, while catalytic water splitting and hydrogen production are multi-electron processes; thus there is the need for controlling accumulative electron transfer on molecular components. (ii) Water splitting and proton reduction at the potential catalysts necessarily require the management of proton release and/or uptake. Far from being just a stoichiometric requirement, this controls the electron transfer processes by proton-coupled electron transfer (PCET). (iii) Redox-active links between the photosensitizers and the catalysts are required to rectify the accumulative electron-transfer reactions, and will often be the starting points of PCET.
Ämnesord
- NATURVETENSKAP -- Kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences (hsv//eng)
Nyckelord
- artificial photosynthesis
- proton-coupled electron transfer
- photosystem II
- manganese
- tyrosine
- Chemistry
- Kemi
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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