Analytical Sciences
Online ISSN : 1348-2246
Print ISSN : 0910-6340
ISSN-L : 0910-6340
Original Papers
Highly Effective Extraction of Iron(III) with 4-Isopropyltropolone in Nonpolar Solvents Containing 3,5-Dichlorophenol as a Synergist
Hisanori IMURAKen-ichiro ISHIMORIKousaburo OHASHI
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2000 Volume 16 Issue 12 Pages 1297-1302

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Abstract

A great enhancement in the extraction of iron(III) with 4-isopropyltropolone (Hipt) has been observed upon the addition of 3,5-dichlorophenol (DCP) as a hydrogen-bond donor, and highly efficient synergistic extraction system for iron(III) was presented using nonpolar solvents such as heptane and cyclohexane. An equilibrium study of the heptane system has demonstrated the formation of the adduct complexes of not only the iron(III) chelate, Fe(ipt)3·nDCP (n = 1 - 3), but the reagent, Hipt·nDCP (n = 1, 2). The formation constants (βM,n = [Fe(ipt)3·nDCP]org/[Fe(ipt)3]org[DCP]orgn, βH,n = [Hipt·nDCP]org/[Hipt]org[DCP]orgn) of the corresponding complexes were determined and evaluated by comparing with those of acetylacetone (Hacac). The values obtained for Fe(ipt)3 and Hipt were larger than those for Fe(acac)3 and Hacac, respectively, suggesting the higher hydrogen-bond accepting power and basicity of the former ligand.

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© 2000 by The Japan Society for Analytical Chemistry
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