The electrode process of Fe (BA)
3 in DMF has been investigated by polarography and controlled potential electrolysis. The effects of water and acid on the behavior of Fe (BA)
3 in DMF have been studied. Fe (BA)
3 is reversibly reduced to Fe(BA)
3- in DMF at a dropping mercury electrode in the presence of large excess of ligand. Addition of water affects the D.C. and A.C. wave heights and the half wave potentials, but the electrode process is essentially identical with that in water free DMF. In acidic media, are observed several polarographic waves, which correspond to different species of iron-benzoylacetonates in the solution. From the polarographic data, the concentration of each species of the chelates can be determined and the consecutive formation constants of ironbenzoylacetonate have been calculated as log K
1=13.8, log K
3=12.7 and log K
3=10.9. The acid dissociation constant of benzoylacetone in DMF determined by pH titration with a glass electrode is 13.2.
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