Electrochemistry of oxo-bridged ruthenium dimers with 4,4′-dichloro- and 5,5′-dichloro-2,2′-bipyridine and their catalytic properties towards water oxidation

Yip Kai Lai, Kwok Yin Wong

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24 Citations (Scopus)


Ruthenium μ-oxo dimers with chloro-substituted 2,2′-bipyridines [L2(H2O)RuIIIORuIII(OH2)L2]4+(L= 4,4′-dichloro- or 5,5′-dichloro-2,2′-bipyridine) were synthesized. Electrochemical studies on the complexes showed that the RuIII|O|RuIIIdimer undergoes a reversible one-electron oxidation to RuIII|O|RuIVfollowed by a reversible multi-electron oxidation assignable as the oxidation of RuIII|O|RuIVto RuIV|O|RuV. The RuIII|O|RuIVand RuIV|O|RVspecies were characterized by thin-layer spectroelectrochemistry. The RuIV|O|RuVdimer is an active catalyst for the chemical or electrochemical oxidation of water to dioxygen. Upon reduction, the RuIII|O|RuIIIdimer undergoes reductive cleavage to give [RuIIL2(H2O)2]2+. The chloro-substituted ruthenium dimers are more stable towards reductive cleavage in mildly acidic media than the unsubstituted [(bpy)2(H2O)RuIIIORuIII(OH2)(bpy)2]4+(bpy= 2,2′-bipyridine).
Original languageEnglish
Pages (from-to)193-200
Number of pages8
JournalJournal of Electroanalytical Chemistry
Issue number1-2
Publication statusPublished - 3 Jan 1995


  • Bipyridines
  • Catalysis
  • Ruthenium oxo-bridged dimers
  • Water oxidation

ASJC Scopus subject areas

  • Analytical Chemistry
  • Chemical Engineering(all)
  • Electrochemistry

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