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

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

doi:10.1002/ejic.200600111

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

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

Advanced Science Research Center

Research output: Contribution to journal › Article › peer-review

11 Citations (Scopus)

Abstract

The orange [Ru^II(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/Ru^II redox potential was studied by cyclic voltammetry in methanol containing 0.1 M LiClO₄. Complete deprotonation shifts the Ru^II/Ru^II 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 Ru^III complex, [Ru^III(H₃L)] ³⁺, was formed by controlled-potential electrolysis of 1, and the electronic spectrum is reported.

Original language	English
Pages (from-to)	3236-3243
Number of pages	8
Journal	European Journal of Inorganic Chemistry
Issue number	16
DOIs	https://doi.org/10.1002/ejic.200600111
Publication status	Published - Aug 21 2006

Keywords

Chirality
N ligands
Redox chemistry
Ruthenium
Schiff bases
Tripodal ligands

ASJC Scopus subject areas

Inorganic Chemistry

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@article{e203c3099e88409fa03270db3bf18f4b,

title = "A ruthenium(II) complex with a tripodal ligand containing three imidazole groups",

abstract = "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.",

keywords = "Chirality, N ligands, Redox chemistry, Ruthenium, Schiff bases, Tripodal ligands",

author = "Tomoka Yamaguchi and Kazutoshi Harada and Yukinari Sunatsuki and Masaaki Kojima and Kiyohiko Nakajima and Naohide Matsumoto",

year = "2006",

month = aug,

day = "21",

doi = "10.1002/ejic.200600111",

language = "English",

pages = "3236--3243",

journal = "Chemische Berichte",

issn = "0009-2940",

publisher = "Wiley-VCH Verlag",

number = "16",

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TY - JOUR

T1 - A ruthenium(II) complex with a tripodal ligand containing three imidazole groups

AU - Yamaguchi, Tomoka

AU - Harada, Kazutoshi

AU - Sunatsuki, Yukinari

AU - Kojima, Masaaki

AU - Nakajima, Kiyohiko

AU - Matsumoto, Naohide

PY - 2006/8/21

Y1 - 2006/8/21

N2 - 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.

AB - 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.

KW - Chirality

KW - N ligands

KW - Redox chemistry

KW - Ruthenium

KW - Schiff bases

KW - Tripodal ligands

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