Mononuclear ruthenium(II) complexes that catalyze water oxidation

Huan Wei Tseng, Ruifa Zong, James Muckerman, Randolph Thummel

Research output: Contribution to journalArticle

284 Citations (Scopus)

Abstract

Two series of mononuclear ruthenium(II) complexes involving polypyridine-type ligands have been prepared, and their ability to act as catalysts for water oxidation has been examined. One series is of the type [Ru(tpy)(NN)CI](PF6) (tpy = 2,2′; 6,2″-terpyridine), where NN is one of 12 different bidentate ligands, and the other series includes various combinations of 4-picoline, 2,2′-bipyridine (bpy), and tpy as well as the tetradentate 2,9-dipyrid-2′-yl-1,10-phenanthroline (dpp). The electronic absorption and redox data for these compounds have been measured and reported. The long-wavelength metal-to-ligand charge-transfer absorption and the first oxidation and reduction potentials are found to be consistent with the structure of the complex. Of the 23 complexes, 14 catalyze water oxidation and all of these contain a tpy or dpp. Kinetic measurements indicate a first-order reaction and together with a catalyst recovery experiment argue against the involvement of RuO2. A tentative mechanism is proposed that involves a seven-coordinate RuVI=O species that is attacked by water to form the critical O-O bond. Density functional theory calculations, which support the proposed mechanism, are performed.

Original languageEnglish
Pages (from-to)11763-11773
Number of pages11
JournalInorganic Chemistry
Volume47
Issue number24
DOIs
Publication statusPublished - 2008

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Ruthenium
ruthenium
Ligands
Oxidation
ligands
oxidation
Water
water
catalysts
Catalysts
Density functional theory
Charge transfer
Metals
recovery
charge transfer
density functional theory
Recovery
Wavelength
Kinetics
kinetics

ASJC Scopus subject areas

  • Inorganic Chemistry
  • Physical and Theoretical Chemistry

Cite this

Mononuclear ruthenium(II) complexes that catalyze water oxidation. / Tseng, Huan Wei; Zong, Ruifa; Muckerman, James; Thummel, Randolph.

In: Inorganic Chemistry, Vol. 47, No. 24, 2008, p. 11763-11773.

Research output: Contribution to journalArticle

Tseng, Huan Wei ; Zong, Ruifa ; Muckerman, James ; Thummel, Randolph. / Mononuclear ruthenium(II) complexes that catalyze water oxidation. In: Inorganic Chemistry. 2008 ; Vol. 47, No. 24. pp. 11763-11773.
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