Abstract
A compound library of seven asymmetrically substituted viologens and, additionally, a bis-viologen is investigated by voltammetric and EPR- and UV–Vis spectroelectrochemical techniques as well as diffusion-ordered nuclear magnetic resonance (NMR) spectroscopy. In acetonitrile-based electrolytes, all compounds show a stepwise two electron chemically and electrochemically reversible reduction of the viologen moieties. In the case of the bis-viologen, peak potential difference data indicate a weak difference in the formal potentials of the two non-conjugated redox systems. Diffusion coefficients from cyclic voltammetric and pulse gradient spin echo NMR experiments are comparable for all mono-viologens while the size and saturation of the side chain in the mono-viologen compounds has only a minor influence on this transport property. The semi-quinone forms of the viologens are highly stable with respect to disproportionation and they are EPR active. For the mono-viologens, coupling constants for all hydrogen and nitrogen nuclei interacting with the unpaired electron were determined. The bis-viologen forms a bis(radical cation) as well as an EPR-silent (but UV-detectable) π-dimer. Furthermore, the effect of weakly coordinating anions on the different redox states is reported.
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Acknowledgments
The authors thank J. Edrich and P. Finkbeiner for preliminary experiments. The authors also thank the Deutsche Metrohm GmbH & Co. KG Filderstadt, Germany, for providing the UV–Vis spectroelectrochemical setup. AR thanks the Universität Tübingen for an LGFG fellowship.
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Dedicated to the late Lothar Dunsch, a colleague and friend.
Two-electron-transfer redox systems. Part 9. for Part 8, see ref. [1]; the list of authors is ordered alphabetically within the participating institutes.
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Passon, M., Ruff, A., Schuler, P. et al. Redox behaviour of some asymmetrically substituted viologens and an alkyl bridged bis-viologen in non-aqueous solvents: a voltammetric and spectroscopic investigation. J Solid State Electrochem 19, 85–101 (2015). https://doi.org/10.1007/s10008-014-2629-2
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DOI: https://doi.org/10.1007/s10008-014-2629-2