THE DEPENDENCE OF THE SELECTIVITY OF THE EXTRACTION OF SOME BATHOFERROINE ION PAIRS ON THE STRUCTURE OF WATER IN THE AQUEOUS PHASE

The paper deals with the mechanism of increasing the selectivity of some bathoferroine (tris/bathophe-nanthroline /iron/II/cation) ion pairs by adding selected nonelectrolytes to the water phase. The dependence of the bathoferroine cation hydration number and extraction selectivity on the concentration of the nonelectrolyte and temperature has been found. The dependence of the extraction selectivity on ethanol concentration in the water phase with various solvents as the organic phase has been investigated, too. Moreover, the solvation number (ethanoi) of ion association compounds tested in conditions of the best extraction selectivity has been determined Details concerning the behaviour of the extraction system have been discussed based on the theory of the structure of liquid water.