We report in this study on the voltammetric investigation of the reactivity of a cobalt Schiff base complex, namely N,N'-bis(salicylidene)ethylene diamino cobalt(II) so-called Co-II-salen in 1-butyl-3methylimidazolium hexafluorophosphate, [BMIm] [PF6], towards selected organo-halogenated derivatives. The obtained results indicate that the electrochemical behavior of Coll-salen in the room temperature ionic liquid is similar to that previously reported in various organic solvents. Also, the nature of the involved mechanisms of the electroreductive activation of the organottalogenated derivatives is almost unchanged in [BMIm][PF6] compared with the usual conventional organic solvents. (C) 2003 Elsevier B.V. All rights reserved.