Abstract
This paper describes the investigation, using semi-differential cyclic voltammetry, of the behaviour of josamycin (L) in the nitrobenzene phase which facilitates the transfer of alkaline earth cations (M 2+) across the water (W)-nitrobenzene (NB) interface. The peak height is directly proportional to the concentration of josamycin in nitrobenzene and to the potential scan rate. The peak potential shifts towards the negative direction with increasing concentration of the alkaline earth ion in water and josamycin in nitrobenzene. The transfer mechanism was studied. The complexes formed by the alkaline earth metal ions with josamycin at the W-NB interface are ML 2 2+ ions. The stability constants of the complexes were found; they increase in the order MgL 2 2+ > CaL 2 2+ > SrL 2 2+ > BaL 2 2+. All the experimental results were in agreement with theoretical values.
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