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(a) Cyclic voltammograms of the Fe(III)–HQNO2-L-Pro system at various scan rates (indicated in the figure). (b) Current is plotted against the root square of the applied scan rate for the same system. Both curves are linear with similar slopes that suggest a diffusion-controlled electrode reaction in both oxidation states. {cligand = 1.5 mM, cFe(III) = 0.5 mM; pH = 7.40 (10 mM HEPES), t = 25 °C, I = 0.1 M (TBAN)}.
