PHYSICOCHEMICAL PROPERTIES OF COPPER(II) BIS(2-ETHYLHEXYL) SULFOSUCCINATE REVERSED MICELLES

Measurements of some physicochemical properties (density, viscosity, c onductance, UV-vis spectra, IR spectra) of the water/copper(II) bis(2- ethylhexyl) sulfosuccinate (Cu(DEHSS)(2))/CCl4 microemulsions, at a fi xed 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 dynamica l properties of the water-containing Cu(DEHSS)(2) reversed micelles an d of their evolution with R are derived from the experimental results. The comparison with the same properties of water-containing sodium bi s(2-ethylhexyl) sulfosuccinate reversed micelles allows to evidence th e pivotal role of the water-triggered interactions between the counter ion and the surfactant anion on driving the structural and dynamical e volution of reversed micelles. (C) 1998 Academic Press.