M. Tsuchiya et al., SOLVENT-EXTRACTION OF GALLIUM(III) AND INDIUM(III) WITH 1-(4-ETHYLPHENYL)-3-HYDROXY-4-PYRIDONES AND 1-(4-ETHYLPHENYL)-3-HYDROXY-2-METHYL-4-PYRIDONES, Analytical sciences, 11(3), 1995, pp. 343-347
A new extracting agent, 1-(4-ethylphenyl)-3-hydroxy-4-pyridone (C2-HPP
), was synthesized and used for the extraction of aluminum(III), galli
um(III) and indium(III) into 1,2-dichloroethane. The acid dissociation
constants, K-a, and the partition coefficient, K-D, of C2-HPP and the
extraction constants, K-ex, of its metal complexes were determined. T
hese results obtained were compared with those of 1-(4-ethylphenyl)-3-
hydroxy-2-methyl-4-pyridone (C2-HMPP) reported already. The removal of
a methyl group from the molecule of C2-HMPP was very effective for in
creasing the K-a values of C2-HPP and K-ex values of the metal complex
es. The extracted species were ML(3) in all the extraction systems, wh
ere M denotes the metal ion.