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

Journal Article · · Proceedings of the National Academy of Sciences of the United States of America
 [1];  [2];  [2];  [2];  [3];  [2];  [2];  [2]
  1. Univ. of North Carolina, Chapel Hill, NC (United States). Dept. of Chemistry; Brookhaven National Lab. (BNL), Upton, NY (United States)
  2. Univ. of North Carolina, Chapel Hill, NC (United States). Dept. of Chemistry
  3. Univ. of North Carolina, Chapel Hill, NC (United States). Dept. of Chemistry; Univ. of South Carolina, Columbia, SC (United States). Dept. of Chemistry and Biochemistry

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. In conclusion, 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.

Research Organization:
Energy Frontier Research Centers (EFRC) (United States). Center for Solar Fuels (UNC EFRC)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Contributing Organization:
UNC partners with University of North Carolina (lead); Duke University; University of Florida; Georgia Institute of Technology; University; North Carolina Central University; Research Triangle Institute
Grant/Contract Number:
SC0001011; CHE-0957215
OSTI ID:
1210509
Journal Information:
Proceedings of the National Academy of Sciences of the United States of America, Vol. 112, Issue 16; ISSN 0027-8424
Publisher:
National Academy of Sciences, Washington, DC (United States)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 108 works
Citation information provided by
Web of Science

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Efficient BiVO 4 Photoanodes by Postsynthetic Treatment: Remarkable Improvements in Photoelectrochemical Performance from Facile Borate Modification journal November 2019
Cooperative water oxidation catalysis in a series of trinuclear metallosupramolecular ruthenium macrocycles journal January 2017
Mechanistic Insights into Light‐Activated Catalysis for Water Oxidation journal April 2019
Base-enhanced electrochemical water oxidation by a nickel complex in neutral aqueous solution journal January 2019
O–O bond formation in ruthenium-catalyzed water oxidation: single-site nucleophilic attack vs. O–O radical coupling journal January 2017
Mechanisms of molecular water oxidation in solution and on oxide surfaces journal January 2017
Light‐Driven Water Splitting Mediated by Photogenerated Bromine journal March 2018
Electrocatalytic Water Oxidation by Mononuclear Cu(II) Aliphatic Tetraamine Complexes journal March 2019
Proton coupled electron transfer from Co 3 O 4 nanoparticles to photogenerated Ru(bpy) 3 3+ : base catalysis and buffer effect journal January 2018
Kinetics and mechanisms of catalytic water oxidation journal January 2019
Control over Electrochemical Water Oxidation Catalysis by Preorganization of Molecular Ruthenium Catalysts in Self-Assembled Nanospheres journal August 2018
Mechanistic Insights into Light-Activated Catalysis for Water Oxidation: Mechanistic Insights into Light-Activated Catalysis for Water Oxidation journal January 2019
How to make an efficient and robust molecular catalyst for water oxidation journal January 2017
Water Oxidation by Ruthenium Complexes Incorporating Multifunctional Bipyridyl Diphosphonate Ligands journal May 2016
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Catalyst–solvent interactions in a dinuclear Ru-based water oxidation catalyst journal January 2016
Efficient BiVO 4 Photoanodes by Postsynthetic Treatment: Remarkable Improvements in Photoelectrochemical Performance from Facile Borate Modification journal December 2019
A Nickel(II) Complex as a Homogeneous Electrocatalyst for Water Oxidation at Neutral pH: Dual Role of HPO 4 2− in Catalysis journal September 2016
Homogenous electrochemical water oxidation by a nickel( ii ) complex based on a macrocyclic N-heterocyclic carbene/pyridine hybrid ligand journal January 2019
Control over Electrochemical Water Oxidation Catalysis by Preorganization of Molecular Ruthenium Catalysts in Self-Assembled Nanospheres journal August 2018
Electrochemical Formation of Fe V (O) and Mechanism of Its Reaction with Water During O−O Bond Formation journal February 2017
Water Oxidation by Ruthenium Complexes Incorporating Multifunctional Bipyridyl Diphosphonate Ligands journal May 2016
Artificial photosynthesis: opportunities and challenges of molecular catalysts journal January 2019
Crystal structures of three 4-substituted-2,2′-bipyridines synthesized by Sonogashira and Suzuki–Miyaura cross-coupling reactions journal March 2017
Synthesis of new photosensitive H 2 BBQ 2+ [ZnCl 4 ] 2− /[(ZnCl) 2 (μ-BBH)] complexes, through selective oxidation of H 2 O to H 2 O 2 journal January 2017
Direct oxygen isotope effect identifies the rate-determining step of electrocatalytic OER at an oxidic surface journal November 2018
Proton Acceptor near the Active Site Lowers Dramatically the O–O Bond Formation Energy Barrier in Photocatalytic Water Splitting journal November 2019