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The pH dependent electrochemical properties of anthraquinone-2,7-disulphonic acid, 2,7-AQDS, have been investigated both in solution and as adsorbed monolayers. In low pH electrolyte, the voltammetric responses observed for the conversion of the quinone, Q, to hydroquinone, H 2 Q, are close to ideal for both diffusive and adsorbed reactants and redox switching is controlled by electron rather...