Controlling the redox properties of a pyrroloquinolinequinone (PQQ) derivative in a ruthenium(ii) coordination sphere

Hiroumi Mitome, Tomoya Ishizuka, Yoshihito Shiota, Kazunari Yoshizawa, Takahiko Kojima

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Ruthenium(ii) complexes of PQQTME, a trimethyl ester derivative of redox-active PQQ (pyrroloquinolinequinone), were prepared using a tridentate ligand, 2,2′:6′,2′′-terpyridine (terpy) as an auxiliary ligand. The characterization of the complexes was performed by spectroscopic methods, X-ray crystallography, and electrochemical measurements. In one complex, the pyridine site of PQQTME binds to the [RuII(terpy)] unit as a tridentate ligand, and a silver(i) ion is coordinated by the quinone moiety in a bidentate fashion. In contrast, another complex includes the [RuII(terpy)] unit at the bidentate quinone moiety of the PQQTME ligand. The difference in the coordination modes of the complexes exhibits a characteristic difference in the stability of metal coordination and also in the reversibility of the reduction processes of the PQQTME ligand. It should be noted that an additional metal-ion-binding to the PQQTME ligand largely raises the 1e--reduction potential of the ligand. In addition, we succeeded in the characterization of the 1e--reduced species of the complexes, where the unpaired electron was delocalized in the π-conjugated system of the PQQTME- ligand, using UV-Vis absorption and ESR spectroscopies. This journal is

Original languageEnglish
Pages (from-to)3151-3158
Number of pages8
JournalDalton Transactions
Volume44
Issue number7
DOIs
Publication statusPublished - Feb 21 2015

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Ruthenium
Ligands
Derivatives
Oxidation-Reduction
X ray crystallography
Silver
Metal ions
Paramagnetic resonance
Esters
Metals
Spectroscopy
Ions
Electrons

All Science Journal Classification (ASJC) codes

  • Inorganic Chemistry

Cite this

Controlling the redox properties of a pyrroloquinolinequinone (PQQ) derivative in a ruthenium(ii) coordination sphere. / Mitome, Hiroumi; Ishizuka, Tomoya; Shiota, Yoshihito; Yoshizawa, Kazunari; Kojima, Takahiko.

In: Dalton Transactions, Vol. 44, No. 7, 21.02.2015, p. 3151-3158.

Research output: Contribution to journalArticle

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