A STUDY OF THE DEPENDENCE OF FERROCENE DIFFUSION ON ELECTROLYTE CONCENTRATION AND SIZE IN A POLYMER MEDIUM USING NON-STEADY-STATE CHRONOAMPEROMETRY

This article describes a quantitative study of the diffusion rate of f errocene(Fc) dissolved in ploy(ethylene glycol)(PEG) medium containing MClO(4)(M = Li+, Na+, Bu(4)N(+), Hx(4)N(+)). The apparent diffusion c oefficient D-app and the active concentration c(a) of Fc were simultan eously measured by using non-steady-state chronoamperometry. The D-app and c(a) of Fc have been estimated in PEG containing different concen trations and sizes of supporting electrolyte, and the dependence of D- app on ferrocene concentrations has been observed. The values of D-app decrease with increasing concentrations of Fc, increasing concentrati ons of LiClO4 or the ratio (O:Li) and also with 4 decreasing cation ra dius of the electrolyte. The temperature dependencies conform to a sim ple free volume model. The concentration and size of the counterion de pendencies of the diffusion rate are similar to the behavior of their dependencies of ionic conductivity in polyelectrolyte.