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Cyclic voltammograms of the copper complexes of (A) DO4S (C[Cu(DO4S)]2+ = 1.02 × 10–3 mol/L), (B) DO3S (C[Cu(DO3S)]2+ = 1.13 × 10–3 mol/L), and (C) DO2A2S (C[Cu(DO2A2S)] = 6.48 × 10–4 mol/L) in aqueous solution at pH 7, I = NaNO3 0.15 mol/L, and T = 25 °C. Scan rates: 0.1 V/s (A and B) and 0.01 V/s (C).
