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Issue 44, 2017
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Two ruthenium complexes capable of storing multiple electrons on a single ligand – photophysical, photochemical and electrochemical properties of [Ru(phen)2(TAPHAT)]2+ and [Ru(phen)2(TAPHAT)Ru(phen)2]4+

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Abstract

The photophysical, photochemical and electrochemical properties of two newly synthesized ruthenium complexes, [Ru(phen)2(TAPHAT)]2+ and [Ru(phen)2(TAPHAT)Ru(phen)2]4+, are reported. We have developed a novel synthetic methodology that involves the metal-free oxidative coupling of diamino compounds to form a desired “pyrazine-type” core. This methodology is employed both on the free diamino ligand as well as on the different ruthenium complexes, therefore illustrating the applicability of this reaction. The TAPHAT ligand, which possesses 7 aromatic rings and 10 nitrogen atoms for 20 carbon atoms, gives rise to ruthenium complexes that can undergo up to three consecutive reductions centered on said ligand, a critical parameter for electron storage applications. A temperature-dependent study has confirmed the presence of a 4th MLCT state. Excited-state quenching in the presence of guanine or hydroquinone allows to foresee biomedical applications.

Graphical abstract: Two ruthenium complexes capable of storing multiple electrons on a single ligand – photophysical, photochemical and electrochemical properties of [Ru(phen)2(TAPHAT)]2+ and [Ru(phen)2(TAPHAT)Ru(phen)2]4+

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Publication details

The article was received on 31 Aug 2017, accepted on 28 Sep 2017 and first published on 29 Sep 2017


Article type: Paper
DOI: 10.1039/C7DT03232C
Citation: Dalton Trans., 2017,46, 15287-15300
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    Two ruthenium complexes capable of storing multiple electrons on a single ligand – photophysical, photochemical and electrochemical properties of [Ru(phen)2(TAPHAT)]2+ and [Ru(phen)2(TAPHAT)Ru(phen)2]4+

    L. Troian-Gautier, L. Marcélis, J. De Winter, P. Gerbaux and C. Moucheron, Dalton Trans., 2017, 46, 15287
    DOI: 10.1039/C7DT03232C

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