Water Oxidation by Single-Site Ruthenium Complexes: Using Ligands as Redox and Proton Transfer Mediators

2012 ◽  
Vol 51 (46) ◽  
pp. 11589-11593 ◽  
Author(s):  
Markus D. Kärkäs ◽  
Torbjörn Åkermark ◽  
Eric V. Johnston ◽  
Shams R. Karim ◽  
Tanja M. Laine ◽  
...  
Keyword(s):  
Proton Transfer ◽  
Water Oxidation ◽  
Ruthenium Complexes ◽  
Single Site

Water Oxidation by Single-Site Ruthenium Complexes: Using Ligands as Redox and Proton Transfer Mediators

2012 ◽  
Vol 124 (46) ◽  
pp. 11757-11761 ◽  
Author(s):  
Markus D. Kärkäs ◽  
Torbjörn Åkermark ◽  
Eric V. Johnston ◽  
Shams R. Karim ◽  
Tanja M. Laine ◽  
...  
Keyword(s):  
Proton Transfer ◽  
Water Oxidation ◽  
Ruthenium Complexes ◽  
Single Site

scholarly journals Base-enhanced catalytic water oxidation by a carboxylate–bipyridine Ru(II) complex

2015 ◽  
Vol 112 (16) ◽  
pp. 4935-4940 ◽  
Author(s):  
Na Song ◽  
Javier J. Concepcion ◽  
Robert A. Binstead ◽  
Jennifer A. Rudd ◽  
Aaron K. Vannucci ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Proton Transfer ◽  
Water Oxidation ◽  
Proton Acceptor ◽  
Half Time ◽  
X Ray ◽  
X Ray Crystallography ◽  
Buffer Base ◽  
Electron Proton Transfer ◽  
C Nmr

In aqueous solution above pH 2.4 with 4% (vol/vol) CH3CN, the complex [RuII(bda)(isoq)2] (bda is 2,2′-bipyridine-6,6′-dicarboxylate; isoq is isoquinoline) exists as the open-arm chelate, [RuII(CO2-bpy-CO2−)(isoq)2(NCCH3)], as shown by 1H and 13C-NMR, X-ray crystallography, and pH titrations. Rates of water oxidation with the open-arm chelate are remarkably enhanced by added proton acceptor bases, as measured by cyclic voltammetry (CV). In 1.0 M PO43–, the calculated half-time for water oxidation is ∼7 μs. The key to the rate accelerations with added bases is direct involvement of the buffer base in either atom–proton transfer (APT) or concerted electron–proton transfer (EPT) pathways.

scholarly journals Tunable single-site ruthenium catalysts for efficient water oxidation

2011 ◽  
Vol 47 (28) ◽  
pp. 8058 ◽  
Author(s):  
Lucile Bernet ◽  
Ralte Lalrempuia ◽  
Wadih Ghattas ◽  
Helge Mueller-Bunz ◽  
Laura Vigara ◽  
...  
Keyword(s):  
Water Oxidation ◽  
Ruthenium Catalysts ◽  
Single Site

scholarly journals Oxo-Bridge Scenario behind Single-Site Water-Oxidation Catalysts

2014 ◽  
Vol 54 (2) ◽  
pp. 658-666 ◽  
Author(s):  
Isidoro López ◽  
Somnath Maji ◽  
J. Benet-Buchholz ◽  
Antoni Llobet
Keyword(s):  
Water Oxidation ◽  
Single Site ◽  
Oxidation Catalysts ◽  
Site Water ◽  
Oxo Bridge

Efficient Electrochemical Water Oxidation Mediated by Pyridylpyrrole-Carboxylate Ruthenium Complexes

2021 ◽  
Author(s):  
Guo Chen ◽  
Ze-Wen Chen ◽  
Yuan-Mei Wang ◽  
Piao He ◽  
Chao Liu ◽  
...  
Keyword(s):  
Water Oxidation ◽  
Ruthenium Complexes

Photochemical, Electrochemical, and Photoelectrochemical Water Oxidation Catalyzed by Water-Soluble Mononuclear Ruthenium Complexes

2014 ◽  
Vol 20 (43) ◽  
pp. 13957-13964 ◽  
Author(s):  
Ting-Ting Li ◽  
Wei-Liang Zhao ◽  
Yong Chen ◽  
Fu-Min Li ◽  
Chuan-Jun Wang ◽  
...  
Keyword(s):  
Water Oxidation ◽  
Ruthenium Complexes ◽  
Water Soluble ◽  
Photoelectrochemical Water Oxidation

scholarly journals Atomically manipulated proton transfer energizes water oxidation on silicon carbide photoanodes

2018 ◽  
Vol 6 (47) ◽  
pp. 24358-24366 ◽  
Author(s):  
Hao Li ◽  
Huan Shang ◽  
Yuchen Shi ◽  
Rositsa Yakimova ◽  
Mikael Syväjärvi ◽  
...  
Keyword(s):  
Silicon Carbide ◽  
Electron Transfer ◽  
Proton Transfer ◽  
Water Oxidation ◽  
Proton Coupled Electron Transfer ◽  
Rate Limiting Step ◽  
Limiting Step ◽  
Rate Limiting

Preferential exposure of Si-face of SiC will mechanistically shift the rate limiting step of water oxidation from sluggish proton-coupled electron transfer on C-face to a more energy-favorable electron transfer.

scholarly journals Electron, proton and hydrogen–atom transfers in photosynthetic water oxidation

2002 ◽  
Vol 357 (1426) ◽  
pp. 1383-1394 ◽  
Author(s):  
Cecilia Tommos
Keyword(s):  
Photosystem Ii ◽  
Proton Transfer ◽  
Water Oxidation ◽  
Oxidation Mechanism ◽  
Bulk Solution ◽  
Hydrogen Atoms ◽  
Redox Active ◽  
Hydrogen Atom Transfers ◽  
Reduce Carbon Dioxide ◽  
Photosynthetic Water Oxidation

When photosynthetic organisms developed so that they could use water as an electron source to reduce carbon dioxide, the stage was set for efficient proliferation. Algae and plants spread globally and provided the foundation for our atmosphere and for O 2 –based chemistry in biological systems. Light–driven water oxidation is catalysed by photosystem II, the active site of which contains a redox–active tyrosine denoted Y Z , a tetramanganese cluster, calcium and chloride. In 1995, Gerald Babcock and co–workers presented the hypothesis that photosynthetic water oxidation occurs as a metallo–radical catalysed process. In this model, the oxidized tyrosine radical is generated by coupled proton/electron transfer and re–reduced by abstracting hydrogen atoms from substrate water or hydroxide–ligated to the manganese cluster. The proposed function of Y Z requires proton transfer from the tyrosine site upon oxidation. The oxidation mechanism of Y Z in an inhibited and O 2 –evolving photosystem II is discussed. Domino–deprotonation from Y Z to the bulk solution is shown to be consistent with a variety of data obtained on metal–depleted samples. Experimental data that suggest that the oxidation of Y Z in O 2 –evolving samples is coupled to proton transfer in a hydrogen–bonding network are described. Finally, a dielectric–dependent model for the proton release that is associated with the catalytic cycle of photosystem II is discussed.

scholarly journals Theoretical study of catalytic mechanism for single-site water oxidation process

2012 ◽  
Vol 109 (39) ◽  
pp. 15669-15672 ◽  
Author(s):  
X. Lin ◽  
X. Hu ◽  
J. J. Concepcion ◽  
Z. Chen ◽  
S. Liu ◽  
...  
Keyword(s):  
Water Oxidation ◽  
Catalytic Mechanism ◽  
Theoretical Study ◽  
Oxidation Process ◽  
Single Site ◽  
Site Water
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