Solvent extraction of 8-quinolinolato-iron(III) with the aid of various phenols as hydrogen-bonding donors.
Effect of various phenols (ArOh) on the solvent extraction of iron(III) with 8-quinolinol (HQ) has been investigated. Greatly enhanced extraction is found in the presence of ArOh, e.g., the distribution ratio of iron(III) with HQ in carbon tetrachloride is increased 200,000-fold by 0.10M 3,5-dichlorophenol. From extraction equilibrium analysis, the enhanced extraction has been ascribed to the formation of association complexes of neutral iron(III) 8-quinolinolate (FeQ(3)) with ArOH as FeQ(3) . nArOH (n = 1, 2,3) in the organic phase, and the association constants (beta(ass,n)) have been determined. A linear relation is observed between logarithmic values of beta(ass,n) and the acid-dissociation constant of ArOH. Existence of the hydrogen bond between FeQ(3) and ArOH is clearly shown by infrared spectroscopy.
Katsuta
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Department of Chemistry, Faculty of Science, Tohoku University, Sendai 980, Japan.
Suzuki
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