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. 2016 Dec 21;7:13934. doi: 10.1038/ncomms13934

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Copyright © 2016, The Author(s)

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(a) Chemical structures of TPAA, [Co(bpy)₃](PF₆)₂ and[Co(bpy)₃](PF₆)₃ used in the present study. (b) Cyclic voltammogram of 1 mM TPAA in 0.1 M TBAPF₆ in ACN. The arrow indicates the position of applied potential in the spectroelectochemical measurements (vide infra); working electrode: platinum; counter electrode: graphite rod; reference electrode: Ag/AgNO₃ (10 mM in ACN). Conversion to the NHE scale was conducted by calibrating the potential of the reference electrode with Fc/Fc⁺ redox couple (0.635 V versus NHE) after the measurements (c) the evolution of the ultraviolet–visible spectra of TPAA after applying a fixed potential at 0.94 V (versus NHE). Black circle for the absorption peak of TPAA; black diamond marks the absorption peak for TPAA^˙+. (d) The graph shows the difference of spectra.