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Iron hydrogenase active site mimic holding a proton and a hydride
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry.
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2006 (English)In: Chemical Communications, ISSN 1359-7345, E-ISSN 1364-548X, no 5, 520-522 p.Article in journal (Refereed) Published
Place, publisher, year, edition, pages
2006. no 5, 520-522 p.
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:uu:diva-95871OAI: oai:DiVA.org:uu-95871DiVA: diva2:170237
Available from: 2007-05-04 Created: 2007-05-04 Last updated: 2017-12-14
In thesis
1. Molecular Approaches to Photochemical Solar Energy Conversion: Towards Synthetic Catalysts for Water Oxidation and Proton Reduction
Open this publication in new window or tab >>Molecular Approaches to Photochemical Solar Energy Conversion: Towards Synthetic Catalysts for Water Oxidation and Proton Reduction
2007 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

A molecular system capable of photoinduced water splitting is an attractive approach to solar energy conversion. This thesis deals with the functional characterization of molecular building blocks for the three principal functions of such a molecular system: Photoinduced accumulative charge separation, catalytic water oxidation, and catalytic proton reduction.

Systems combining a ruthenium-trisbipyridine photosensitizer with multi-electron donors in form of dinuclear ruthenium or manganese complexes were investigated in view of the rate constants of electron transfer and excited state quenching. The kinetics were studied in the different oxidation states of the donor unit by combination of electrochemistry and time resolved spectroscopy. The rapid excited state quenching by the multi-electron donors points to the importance of redox intermediates for efficient accumulative photooxidation of the terminal donor.

The redox behavior of manganese complexes as mimics of the water oxidizing catalyst in the natural photosynthetic reaction center was studied by electrochemical and spectroscopic methods. For a dinuclear manganese complex ligand exchange reactions were studied in view of their importance for the accumulative oxidation of the complex and its reactivity towards water. With the binding of substrate water, multiple oxidation in a narrow potential range and concomitant deprotonation of the bound water it was demonstrated that the manganese complex is capable of mimicking multiple aspects of photosynthetic water oxidation.

A dinuclear iron complex was investigated as biomimetic proton reduction catalyst. The complex structurally mimics the active site of the iron-only hydrogenase enzyme and was designed to hold a proton on the bridging ligand and a hydride on the iron centers. Thermodynamics and kinetics of the protonation reactions and the electrochemical behavior of the different protonation states were studied in view of their potential catalytic performance.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2007. 76 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 306
Keyword
Physical chemistry, artificial photosynthesis, solar fuel, WOC, OEC, accumulative electron transfer, hydrogenase mimic, oxygen evolution, proton reduction, water oxidation, Fysikalisk kemi
Identifiers
urn:nbn:se:uu:diva-7875 (URN)978-91-554-6889-7 (ISBN)
Public defence
2007-05-28, Häggsalen, Ångström, Uppsala, 10:00
Opponent
Supervisors
Available from: 2007-05-04 Created: 2007-05-04Bibliographically approved

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Lomoth, Reiner

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