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Title: Hydrogen Bonding Rescues Overpotential in Seven-Coordinated Ru Water Oxidation Catalysts

Journal Article · · ACS Catalysis
ORCiD logo [1];  [2];  [3];  [3];  [4]; ORCiD logo [5]
  1. Barcelona Institute of Science and Technology (BIST), Tarragona (Spain); Univ. Rovira i Virgili, Tarragona (Spain)
  2. Brookhaven National Lab. (BNL), Upton, NY (United States)
  3. Barcelona Institute of Science and Technology (BIST), Tarragona (Spain)
  4. Univ. Autonoma de Barcelona, Barcelona (Spain)
  5. Barcelona Institute of Science and Technology (BIST), Tarragona (Spain); Univ. Autonoma de Barcelona, Barcelona (Spain)

In this paper, we describe the synthesis, structural characterization, and redox properties of two new Ru complexes containing the dianionic potentially pentadentate [2,2':6',2"-terpyridine]-6,6"-dicarboxylate (tda2–) ligand that coordinates Ru at the equatorial plane and with additional pyridine or dmso acting as monondentate ligand in the axial positions: [RuII(tda-κ-N3O)(py)(dmso)], 1II and [RuIII(tda-κ-N3O2)(py)(H2O)ax]+, 2III(H2O)+. Complex 1II has been characterized by single-crystal XRD in the solid state and in solution by NMR spectroscopy. The redox properties of 1II and 2III(H2O)+ have been thoroughly investigated by means of cyclic voltammetry and differential pulse voltammetry. Complex 2II(H2O) displays poor catalytic activity with regard to the oxidation of water to dioxygen, and its properties have been analyzed on the basis of foot of the wave analysis and catalytic Tafel plots. The activity of 2II(H2O) has been compared with related water oxidation catalysts (WOCs) previously described in the literature. Despite its moderate activity, 2II(H2O) constitutes the cornerstone that has triggered the rationalization of the different factors that govern overpotentials as well as efficiencies in molecular WOCs. The present work uncovers the interplay between different parameters, namely, coordination number, number of anionic groups bonded to the first-coordination sphere of the metal center, water oxidation catalysis overpotential, pKa and hydrogen bonding, and the performance of a given WOC. It thus establishes the basic principles for the design of efficient WOCs operating at low overpotentials.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0012704
OSTI ID:
1405933
Report Number(s):
BNL-114431-2017-JA; R&D Project: CO026; KC0304030
Journal Information:
ACS Catalysis, Vol. 7, Issue 10; ISSN 2155-5435
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 45 works
Citation information provided by
Web of Science

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Cited By (11)

Catalytic Oxidation of Water to Dioxygen by Mononuclear Ru Complexes Bearing a 2,6‐Pyridinedicarboxylato Ligand journal November 2018
Reversible pyrrole-based proton storage/release in ruthenium( ii ) complexes journal January 2019
The development of molecular water oxidation catalysts journal April 2019
Low overpotential water oxidation at neutral pH catalyzed by a copper( ii ) porphyrin journal January 2019
Reversible Decay of Oxygen Evolution Activity of Iridium Catalysts journal January 2019
Universal scaling relations for the rational design of molecular water oxidation catalysts with near-zero overpotential journal November 2019
Strategic Isolation of a Polyoxocation Mimicking Vanadium(V) Oxide Layered-Structure by Stacking of [H2V2O8]4− Anions Bridged by (1,4,7-Triazacyclononane)Co(III) Complexes journal August 2018
Electrochemically Driven Water Oxidation by a Highly Active Ruthenium‐Based Catalyst journal April 2019
Solvent-free aerobic selective oxidation of hydrocarbons catalyzed by porous graphitic carbon encapsulated cobalt composites journal January 2018
Pentanuclear iron catalysts for water oxidation: substituents provide two routes to control onset potentials journal January 2019
An Overview of Significant Achievements in Ruthenium-Based Molecular Water Oxidation Catalysis journal January 2019


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