Abstract
Abstract A synergistic extraction of iron(II) with 4,4,4-trifluoro-1-(2-thienyl)-1,3-butanedione (TTA) and pyridine base was studied in order to clarify the effect of light and shade on the extraction. The extraction constant obtained at a shady place was larger than that obtained at a light place when pyridine or 4-methylpyridine was used as an additive. The stability constants for synergistic adducts at both places were almost the same, and hence it was concluded that the light and shade effect occurs in bonds between the central iron(II) and TTA anions.
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