Water Oxidation by Ruthenium Complexes Incorporating Multifunctional Bipyridyl Diphosphonate Ligands
- Chemistry Division Brookhaven National Laboratory Upton NY 11973-5000 USA
- Chemistry Division Brookhaven National Laboratory Upton NY 11973-5000 USA, Faculty of Chemistry Adam Mickiewicz University Umultowska 89b 61614 Poznan Poland
- Department of Natural Sciences Baruch College, CUNY New York NY 10010 USA
Abstract We describe herein the synthesis and characterization of ruthenium complexes with multifunctional bipyridyl diphosphonate ligands as well as initial water oxidation studies. In these complexes, the phosphonate groups provide redox‐potential leveling through charge compensation and σ donation to allow facile access to high oxidation states. These complexes display unique pH‐dependent electrochemistry associated with deprotonation of the phosphonic acid groups. The position of these groups allows them to shuttle protons in and out of the catalytic site and reduce activation barriers. A mechanism for water oxidation by these catalysts is proposed on the basis of experimental results and DFT calculations. The unprecedented attack of water at a neutral six‐coordinate [Ru IV ] center to yield an anionic seven‐coordinate [Ru IV −OH] − intermediate is one of the key steps of a single‐site mechanism in which all species are anionic or neutral. These complexes are among the fastest single‐site catalysts reported to date.
- Sponsoring Organization:
- USDOE
- Grant/Contract Number:
- SC00112704
- OSTI ID:
- 1400557
- Journal Information:
- Angewandte Chemie, Journal Name: Angewandte Chemie Vol. 128 Journal Issue: 28; ISSN 0044-8249
- Publisher:
- Wiley Blackwell (John Wiley & Sons)Copyright Statement
- Country of Publication:
- Germany
- Language:
- English
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