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Photosynthetic O2 evolution: Chapter 7 
Umeå University, Faculty of Science and Technology, Department of Chemistry.
2012 (English)In: Molecular solar fuels / [ed] Thomas J Wydrzynski, Warwick Hillier, Royal Society of Chemistry, 2012, 163-207 p.Chapter in book (Refereed)
Abstract [en]

Oxygen evolution by photosynthetic water oxidation has shaped life on planet Earth. This unique biological reaction may provide important clues for developing artificial devices (‘artificial leaves’) for splitting water into O2 and H2 by visible light. In this chapter, we summarize the latest structural and mechanistic information on photosystem II, its water-oxidizing complex (WOC), and O2 formation from water at its Mn4CaO5 cluster. Structural information on the WOC derived by X-ray crystallography, X-ray spectroscopy, EPR/ENDOR, and theoretical approaches are compared and discussed in detail. After a description of the basic mechanism of water-oxidation (Kok model), our knowledge about the storage of oxidizing equivalents, substrate water-binding, the release of the products O2 and H+, and the energetics of water-oxidation is described. The near electroneutrality of the water-splitting process via coupling of electron and proton transfer steps and the stabilization of the initial light-driven charge separation by spatial separation and heat dissipation are emphasized as important design principles for coupling fast photochemistry with comparatively slow chemical reactions. The chapter concludes with a discussion of recent DFT-based mechanistic proposals for photosynthetic water oxidation, and with an attempt to identify lessons for the design of artificial systems.

Place, publisher, year, edition, pages
Royal Society of Chemistry, 2012. 163-207 p.
, RSC Energy and Environment Series No 5
National Category
Chemical Sciences
URN: urn:nbn:se:umu:diva-51104DOI: 10.1039/9781849733038-00163ISBN: 978-1-84973-303-8OAI: diva2:475290
Molecular Solar Fuels Solar fuels are a key, carbon-neutral energy resource for the future. Hydrogen is a promising example as the harmless waste product, on combustion with oxygen, is water. The energy released can be coupled to electrical current generation or the reduction of carbon compounds such as carbon dioxide. If hydrogen could be readily produced from water using solar energy, then an ideal fuel cycle would be possible. Written by experts in the field, this book presents the latest knowledge and chemical prospects in developing hydrogen as a solar fuel. Topics covered include: molecular mechanisms for the capture of light, photochemical conversion to chemical potential, and the storage of energy in chemical bonds (both in natural and synthetic chemical systems). Available from: 2012-01-10 Created: 2012-01-10 Last updated: 2012-02-01Bibliographically approved

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