Water Oxidation by Ruthenium Catalysts with Non-Innocent Ligands

Tohru Wada, Koji Tanaka, James T. Muckerman, Etsuko Fujita

Research output: Chapter in Book/Report/Conference proceedingChapter

4 Citations (Scopus)


The possible reaction path for O-O bond formation has been a point of contention among investigators of water oxidation, but there is a growing consensus acknowledging two main pathways: (1) a nucleophilic attack of water on a high-valent metal-oxo species, and (2) a coupling reaction of two metal-oxo species to give μ-peroxide intermediates. This chapter summarizes the novel features of the dinuclear and related mononuclear Ruthenium (Ru) species with quinone ligands. It also summarizes the comparison of their properties with those of the Ru analogs in which the bpy ligand replaces quinone. The chapter explains electrochemical water oxidation using the Tanaka catalyst. It further discusses the acid-base equilibrium and redox behavior of mononuclear Ru-aqua complexes with a variety of dioxolene ligands. The more complicated redox and catalytic properties of the Tanaka catalyst and its related dinuclear complexes are explained.

Original languageEnglish
Title of host publicationMolecular Water Oxidation Catalysis
Subtitle of host publicationA Key Topic for New Sustainable Energy Conversion Schemes
PublisherWiley Blackwell
Number of pages35
ISBN (Electronic)9781118698648
ISBN (Print)9781118413371
Publication statusPublished - Jun 3 2014


  • Dinuclear Ru complexes
  • Dioxolene ligand
  • Intramolecular o-o coupling
  • Mononuclear Ru-aqua complexes
  • Non-innocent ligands (NILs)
  • Ruthenium (Ru) catalysts
  • Tanaka catalyst
  • Water oxidation

ASJC Scopus subject areas

  • Engineering(all)
  • Materials Science(all)

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