Measurements of some physicochemical properties (density, viscosity, conductance, UV-vis spectra, IR spectra) of the water/copper(II) bis(2-ethylhexyl) sulfosuccinate (Cu(DEHSS)(2))/CCl4 microemulsions, at a fixed surfactant molal concentration ([Cu(DEHSS)(2)] = 0.05003 mol kg(-1)), as function of the molar ratio R (R = [water]/[DEHSS-]) have been performed at 25 degrees C. Information on some structural and dynamical properties of the water-containing Cu(DEHSS)(2) reversed micelles and of their evolution with R are derived from the experimental results. The comparison with the same properties of water-containing sodium bis(2-ethylhexyl) sulfosuccinate reversed micelles allows to evidence the pivotal role of the water-triggered interactions between the counterion and the surfactant anion on driving the structural and dynamical evolution of reversed micelles.