The electrochemical behavior of ruthenocene, RuCp(2), was investigated on both a platinum microdisk electrode and a platinum macroelectrode in six different room temperature ionic liquids of varying viscosity, at a range of temperatures and concentrations. It was observed that the redox behavior of RuCp(2) is not well understood in both aqueous and non-aqueous media. A process involving the one electron oxidation of RuCp(2) to the [RuCp(2)](+) monocation, followed by dimerization to form the [Cp(2)Ru-RuCp(2)](2+) species has been speculated although, chronoamperometry suggests that the oxidation of RuCp(2) proceeds via a two-electron process. For this reason, it is believed that an ECE mechanism proceeds in which the electrogenerated [RuCp(2)](+) monocation undergoes a nucleophilic reaction with the anions of the ionic liquid media, in a chemical step which facilitates the transfer of a second electron. (C) 2011 Elsevier B.V All rights reserved.