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

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


11 被引用数 (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.

ジャーナルEuropean Journal of Inorganic Chemistry
出版ステータスPublished - 8月 21 2006

ASJC Scopus subject areas

  • 無機化学


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