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      In Situ IR Study of the Anodic Polarization of Gold Electrodes in Polar Aprotic Solvents: DMSO and DMF Solutions of Cyanate, Thiocyanate and Selenocyanate Ions

      Alwis, Kethsiri H.K.L.; Mucalo, Michael R.
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      J. Electrochem. Soc.-2014-Alwis-H738-50.pdf
      Published version, 947.3Kb
      DOI
       10.1149/2.0441412jes
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      Alwis, K. H. K. L., & Mucalo, M. R. (2014). In Situ IR Study of the Anodic Polarization of Gold Electrodes in Polar Aprotic Solvents: DMSO and DMF Solutions of Cyanate, Thiocyanate and Selenocyanate Ions. Journal of the Electrochemical Society, 161(12), H738–H750. http://doi.org/10.1149/2.0441412jes
      Permanent Research Commons link: https://hdl.handle.net/10289/9311
      Abstract
      Subtractively normalised Fourier transform infrared spectroscopic (SNIFTIRS) studies combined with volammetric and supporting model solution studies have conclusively shown that Au electrodes anodically polarized in DMSO and DMF solutions containing the pseudohalide ions: cyanate, thiocyanate and selenocyanate with tetrabutylammonium perchlorate as supporting electrolyte dissolve to form Au(I) pseudohalide complex ions (i.e. [Au(NCO)₂]⁻, [Au(SCN)₂]⁻ and [Au(SeCN)₂]⁻. This work has demonstrated the significance of the Au(I) oxidation state which occurs after applied voltages of +500 mV(AgCl/Ag) in the little characterized electrochemistry of this metal in polar aprotic solvents, DMSO and DMF The Au(I) species observed electrochemically by SNIFTIRS were confirmed by independent preparation in DMSO/DMF containing mixtures of KAuBr₄ and the pseudohalide salt (KOCN/NaSCN/KSeCN) and exploiting fortuitous redox chemistry where Au(I) formed spontaneously. The model solutions examined by transmission FTIR and ESI-MS confirmed the existence of the Au(I) species posited in the SNIFTIRS experiments but additionally revealed other interesting side reactions occurring in the model solutions.
      Date
      2014
      Type
      Journal Article
      Publisher
      Electrochemical Society
      Rights
      © The Author(s) 2014. Published by ECS. This is an open access article distributed under the terms of the Creative Commons

      Attribution Non-Commercial No Derivatives 4.0 License (CC BY-NC-ND, http://creativecommons.org/licenses/by-nc-nd/4.0/),

      which permits non-commercial reuse, distribution, and reproduction in any medium, provided the original work is not changed in any

      way and is properly cited. For permission for commercial reuse, please email: oa@electrochem.org. [DOI: 10.1149/2.0441412jes]

      All rights reserved.
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