Abstract
Water-insoluble alkynyl-triphosphine tetranuclear Au(I) complexes containing ferrocenyl motifs, [Au4(C2R)2{(PPh2CH)2PPh}2](PF6)2 (L1, R = Fc; L2, R = C6H4Fc) produce, in contact with aqueous electrolytes, anion-assisted reversible solid-state oxidation/reduction reactions in voltammetry and a pure anion transfer reaction determining the open circuit potential in potentiometric measurements. The mid-peak potentials determined in voltammetry and the open circuit potential determined in potentiometry exhibit differences, which allow accessing the individual contributions of Gibbs energies of electron and ion transfer. This is the second example of a solid compound where this separation is possible. Monitoring of anion insertion by electron microscopy (field emission scanning microscopy/energy-dispersive X-ray analysis (FESEM/EDX)) experiments is reported.
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All these models were based on simulated voltammograms for reversible processes involving species in solution. In view of the close similarity of this voltammetric response to that theoretically predicted for reversible, diffusion-controlled processes involving ion-insertion solids (see ref. [38]), it appears reasonable to extend the former formulations to the case of solids.
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Acknowledgments
Special thanks go to Prof. Fritz Scholz for his valuable comments and discussion during the preparation of the manuscript. Financial support has been provided by the Spanish MYCINN CTQ2014-53736-C3-2-P project also supported by ERDF funds.
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Doménech-Carbó, A., Koshevoy, I.O. & Montoya, N. Separation of the ionic and electronic contributions to the overall thermodynamics of the insertion electrochemistry of some solid Au(I) complexes. J Solid State Electrochem 20, 673–681 (2016). https://doi.org/10.1007/s10008-015-3092-4
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DOI: https://doi.org/10.1007/s10008-015-3092-4