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The electrochemical reduction of halogenated organic compounds (RX) is typically performed in organic media. In the present work, we show the catalytic effect of Cobalt(I) Salen during the reduction of lindane and hexachlorobenzene (HCB). CoSalen displays several electrochemical signals; for the purposes of the present study, the most important one is that of the Co(II)/Co(I) couple at –1.55 V vs. Fc+/Fc. Cyclic voltammetry exhibits a catalytic effect, as indicated by the displacement of ca. 0.26 V and 0.16 V for dehalogenation signals in lindane and HCB, respectively. Noticeable, although less pronounced effects were detected as current gains of 65 mA and 7 mA for lindane and HCB, respectively. This catalytic mediator can be used for the target reductions either dissolved in a solution or deposited on the cathodic surface.
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