Water oxidation catalysed by manganese compounds: from complexes to biomimetic rocksDedicated to Stenbjrn Styring, professor at Uppsala University (Sweden) and pioneer of artificial photosynthesis on the occasion of his 60th birthday
One of the most fundamental processes of the natural photosynthetic reaction sequence is the light-driven oxidation of water to molecular oxygen. In vivo , this reaction takes place in the large protein ensemble Photosystem II, where a -oxido-Mn 4 Ca- cluster, the oxygen-evolving-complex (OEC), has...
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| Main Authors | , , |
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| Format | Journal Article |
| Language | English |
| Published |
06.12.2011
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| Online Access | Get full text |
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| Summary: | One of the most fundamental processes of the natural photosynthetic reaction sequence is the light-driven oxidation of water to molecular oxygen.
In vivo
, this reaction takes place in the large protein ensemble Photosystem II, where a -oxido-Mn
4
Ca- cluster, the oxygen-evolving-complex (OEC), has been identified as the catalytic site for the four-electron/four-proton redox reaction of water oxidation. This Perspective presents recent progress for three strategies which have been followed to prepare functional synthetic analogues of the OEC: (1) the synthesis of dinuclear manganese complexes designed to act as water-oxidation catalysts in homogeneous solution, (2) heterogeneous catalysts in the form of clay hybrids of such Mn
2
-complexes and (3) the preparation of manganese oxide particles of different compositions and morphologies. We discuss the key observations from the studies of such synthetic manganese systems in order to shed light upon the catalytic mechanism of natural water oxidation. Additionally, it is shown how research in this field has recently been motivated more and more by the prospect of finding efficient, robust and affordable catalysts for light-driven water oxidation, a key reaction of artificial photosynthesis. As manganese is an abundant and non-toxic element, manganese compounds are very promising candidates for the extraction of reduction equivalents from water. These electrons could consecutively be fed into the synthesis of solar fuels such as hydrogen or methanol.
This article reviews recent progress in biomimetic water-oxidation catalysis using manganese compounds. Three strategies to prepare active catalysts are discussed: Mn
2
-complexes, manganeseclay hybrids and manganese oxides. |
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| Bibliography: | Dedicated to Stenbjrn Styring, professor at Uppsala University (Sweden) and pioneer of artificial photosynthesis on the occasion of his 60 th Hans-Martin Berends (middle) moved to Kiel in 2002 for chemistry studies at the Christian-Albrechts-University. In 2007 he obtained his diploma degree after completing a thesis dealing with dinuclear manganese complexes under the supervision of Felix Tuczek. He continued research in this field and investigates manganese complexes using a variety of electrochemical, spectroscopic and catalytic methods. Philipp Kurz (right) received his chemistry education in Leipzig and Zurich. His interest in photosynthesis started already as a diploma student, when he investigated picoplankton from Lake Lucerne in Switzerland. Since then, the synthesis and investigation of inorganic compounds for artificial photosynthesis has been a central topic of his research, both as a PhD student of Roger Alberto in Zurich and as a postdoc in the group of Stenbjrn Styring in Uppsala. Since 2007 he is a junior research group leader at the Institute for Inorganic Chemistry in Kiel. Mathias Wiechen (left) studied chemistry in Dortmund, where he completed his diploma degree in 2008 with a thesis on self assembled DNA-nanostructures at solid surfaces under the mentoring of Barbara Sacc and Christof M. Niemeyer. In 2009 he started his PhD thesis on the investigation of manganese oxides for biomimetic water-oxidation catalysis at the Institute for Inorganic Chemistry at the Christian-Albrechts-University Kiel as a member of the Kurz group. birthday. |
| ISSN: | 1477-9226 1477-9234 |
| DOI: | 10.1039/c1dt11537e |