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Water oxidation by Ruthenium complexes incorporating multifunctional biipyridyl diphosphonate ligands

Journal Article · · Angewandte Chemie (International Edition)
 [1];  [1];  [2];  [3];  [1]
  1. Brookhaven National Lab. (BNL), Upton, NY (United States)
  2. Brookhaven National Lab. (BNL), Upton, NY (United States); Adam Mickiewicz Univ., Poznan (Poland)
  3. Baruch College, CUNY, New York, NY (United States)
Here, 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 [RuIV] center to yield an anionic seven-coordinate [RuIV–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.
Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI ID:
1333198
Alternate ID(s):
OSTI ID: 1401855
Report Number(s):
BNL--113194-2016-JA; KC0304030
Journal Information:
Angewandte Chemie (International Edition), Journal Name: Angewandte Chemie (International Edition) Journal Issue: 28 Vol. 55; ISSN 1433-7851
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (12)

Proton Acceptor near the Active Site Lowers Dramatically the O–O Bond Formation Energy Barrier in Photocatalytic Water Splitting journal November 2019
Redox‐Active Ligand Assisted Catalytic Water Oxidation by a Ru IV =O Intermediate journal January 2020
Redox‐Active Ligand Assisted Catalytic Water Oxidation by a Ru IV =O Intermediate journal January 2020
Quantum Chemical Study of the Mechanism of Water Oxidation Catalyzed by a Heterotrinuclear Ru 2 Mn Complex journal February 2019
Mononuclear Ru(II) PolyPyridyl Water Oxidation Catalysts Decorated with Perfluoroalkyl C 8 H 17 -Tag Bearing Chains : Mononuclear Ru(II) PolyPyridyl Water Oxidation Catalysts Decorated with Perfluoroalkyl C journal October 2019
Water Oxidation Catalyzed by Ruthenium Complexes with 4-Hydroxypyridine-2,6-dicarboxylate as a Negatively Charged Tridentate Ligand: Water Oxidation Catalyzed by Ruthenium Complexes with 4-Hydroxypyridine-2,6-dicarboxylate as a Negatively Charged Tridentate Ligand journal June 2020
O–O bond formation in ruthenium-catalyzed water oxidation: single-site nucleophilic attack vs. O–O radical coupling journal January 2017
Artificial photosynthesis: opportunities and challenges of molecular catalysts journal January 2019
Effects of a strong π-accepting ancillary ligand on the water oxidation activity of weakly coupled binuclear ruthenium catalysts journal January 2019
Unfolding the complexation and extraction of Am 3+ and Eu 3+ using N-heterocyclic aromatic diphosphonic acids: a combined experimental and DFT study journal January 2019
Structural evolution of the Ru-bms complex to the real water oxidation catalyst of Ru-bda: the bite angle matters journal January 2020
Pentanuclear iron catalysts for water oxidation: substituents provide two routes to control onset potentials journal January 2019


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