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Issue 7, 2015
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Controlling the redox properties of a pyrroloquinolinequinone (PQQ) derivative in a ruthenium(ii) coordination sphere

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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.

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

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Publication details

The article was received on 31 Oct 2014, accepted on 22 Dec 2014 and first published on 22 Dec 2014


Article type: Paper
DOI: 10.1039/C4DT03358B
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Dalton Trans., 2015,44, 3151-3158

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

    H. Mitome, T. Ishizuka, Y. Shiota, K. Yoshizawa and T. Kojima, Dalton Trans., 2015, 44, 3151
    DOI: 10.1039/C4DT03358B

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