A ruthenium(II) complex with a tripodal ligand containing three imidazole groups

Tomoka Yamaguchi, Kazutoshi Harada, Yukinari Sunatsuki, Masaaki Kojima, Kiyohiko Nakajima, Naohide Matsumoto

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11 Citations (Scopus)


The orange [RuII(H3L)](ClO4) 2·3H2O (1) complex was synthesized from cis-[RuCl2(dmso)4] and H3L, where H 3L (tris{[2-{(imidazol-4-yl)methylidene}amino]ethyl}amine) is a tripodal ligand obtained by condensation of tris(2-aminoethyl)amine and 4-formylimidazole in a 1:3 mol ratio. The X-ray crystal structure analysis revealed that the complex has an octahedral structure coordinated by three imidazole nitrogen atoms and three Schiff base (imine) nitrogen atoms. The uncoordinated NH groups of the imidazole moieties of 1 are easily deprotonated by the action of a base. The effect of deprotonation on the Ru III/RuII redox potential was studied by cyclic voltammetry in methanol containing 0.1 M LiClO4. Complete deprotonation shifts the RuII/RuII potential to a much more negative value from -0.18 to -0.72 V vs. Ag/Ag+, making it easier to oxidize. The bluish-purple RuIII complex, [RuIII(H3L)] 3+, was formed by controlled-potential electrolysis of 1, and the electronic spectrum is reported.

Original languageEnglish
Pages (from-to)3236-3243
Number of pages8
JournalEuropean Journal of Inorganic Chemistry
Issue number16
Publication statusPublished - Aug 21 2006


  • Chirality
  • N ligands
  • Redox chemistry
  • Ruthenium
  • Schiff bases
  • Tripodal ligands

ASJC Scopus subject areas

  • Inorganic Chemistry


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