Formation and two-phase distribution equilibria of cobalt(II) and zinc(II) complexes with β-diketones in several solvent extraction systems

Sekine, Tatsuya; Murai, Ryokichi; Niitsu, Masaru; Ihara, Naohiko

doi:10.1016/0022-1902(74)80473-2

Cited by 26 publications

(4 citation statements)

References 21 publications

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“…In the cases of extraction with these four β-diketones the values of the stability constants in the aqueous solution are unknown. However, it has been reported that the values of the stability constants of a metal with a series of homologous ligands seem to be similar if the values of the acid-dissociation constants of the ligands are similar; − therefore, the values of the stability constants of iron(III) with Hbza and Hdbm can be estimated from those with Haa, and those with Hbfa and Htta, from those of Htfa. Using the estimated β n values, the distribution constant for the extractant, K d , and that for the uncharged tris complex species, K dm , as well as the extraction constant, K ex , can be obtained by successive approximation on the basis of eqs 5 and 7.…”

Section: Resultsmentioning

confidence: 99%

Extractability and Solubilization Locus of Six β-Diketones and Their Iron(III) Complexes in Triton X-100 Micellar Solutions

Inaba

1997

Langmuir

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The distribution equilibria of six -diketones and their iron(III) complexes between Triton X-100 micellar and bulk aqueous phases at 298 K were measured spectrophotometrically. The partition constant of the extractants and the complexes, and the extraction constant of iron(III) in the micellar system were obtained simultaneously by a successive approximation calculation on the basis of a simple two-phase partition model. The values of partition constants for the extractants and for the complexes were compared to those obtained in conventional hexane-water and diethyl ether-water systems. The solute-solvent interaction due to the solvation of the acidic proton with oxygen atoms in the polyoxyethylene moiety was estimated in the experiments for the extractants. The effect of steric hindrance in the polyoxyethylene layer due to the formation of a hydrogen-bonded framework in the region was also observed. Hence, the extractants having phenyl substituent groups were mainly distributed in the nonpolar "core" region of the micelle while those having no bulky group or having a polar group in the substituent would penetrate into the polar "mantle" region. The extractability of the complexes with the extractants having trifluoromethyl groups was lower than that without the substituent group. Water molecules which penetrated into the micelle and formed a hydrogen-bonded framework would disturb the solubilization of the complexes with ligands having trifluoromethyl substituents in the structural region due to the low wettability of the substituent.

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Section: Resultsmentioning

confidence: 99%

Extractability and Solubilization Locus of Six β-Diketones and Their Iron(III) Complexes in Triton X-100 Micellar Solutions

Inaba

1997

Langmuir

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“…Mn 2+ and Co 2+ are taken to compare the K ex s value of Fe 2+ , since these metal elements show large synergic effect and belong to the same first transition series. The log K exs , 2 value of Mn 2+ in the Htta-topocyclohexane system was reported as 2.65 [11], and that of Co 2+ in the Htta-topo-CCL, was 0.34 [16]. Organic solvents vary in these systems, but the differences among the log /sT ex>s values are at most only 0.6 in these solvents [11,17].…”

Section: Resultsmentioning

confidence: 97%

Synergic Extraction Equilibrium and Substoichiometric Extraction of Iron(II) with 2-Thenoyltrifluoroacetone and Trioctylphosphine Oxide

et al. 1994

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The synergic extraction of iron(II) was carried out with 2-thenoyltrifluoroacetone (Htta) and trioctylphosphine oxide (topo) into heptane. The extracted species was considered to be Fe(tta) 2 (topo) and Fe(tta) 2 (topo) 2 , and the synergic extraction constants were obtained. The substoichiometric extraction of iron(II) was first attained in the above extraction system within 30 min. Its reproducibility was high (RSD 1.0%) in the Fe 2+ range of 18.7-192 μ^

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“…Thus, it can be expected that the liquid-liquid distribution constants of 4-isopropyltropolonate chelate complexes of europium(III) (K dm : [Eu j A 3j ·aHA] org /[Eu j A 3j ·aHA]) into chloroform should be much higher than those into the other solvents. 9 Therefore, the extraction into chloroform is much better than into the other solvents.…”

Section: Resultsmentioning

confidence: 99%

Effects of a Solvent on the Extraction of Europium(III) with 4-Isopropyltropolone

Noro

1999

ANAL. SCI.

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During the course of conducting a series of studies concerning the solvent extraction of several metal ions by 2-hydroxy-4-(1-methylethyl)-2,4,6-cycloheptatrien-1-one (4-isopropyltropolone; Hipt), it was found that dinuclear chelate complexes of several metal ions were extracted.1-3 Since only chloroform 1,2 or only toluene 3 was used as the solvent in those studies, the effects of the solvent on the extraction and formation of dinuclear chelate complexes of these metal ions were not investigated. However, it has been reported that the formation of polynuclear species with several extractants, such as carboxylic acids, was quite different for different diluents. [4][5][6] It is thus assumed that such a diluent effect should also be found regarding the formation of dinuclear chelate complexes with 4-isopropyltropolone. In the present work, the effects of the diluent on the extraction and formation of dinuclear chelate complexes of europium(III) with 4-isopropyltropolone were studied when the solvent used was carbon tetrachloride, toluene, or 4-methyl-2-pentanone (MIBK). The results were compared with those obtained when the diluent was chloroform, as described in a previous paper.

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Formation and two-phase distribution equilibria of cobalt(II) and zinc(II) complexes with β-diketones in several solvent extraction systems

Cited by 26 publications

References 21 publications

Extractability and Solubilization Locus of Six β-Diketones and Their Iron(III) Complexes in Triton X-100 Micellar Solutions

Extractability and Solubilization Locus of Six β-Diketones and Their Iron(III) Complexes in Triton X-100 Micellar Solutions

Synergic Extraction Equilibrium and Substoichiometric Extraction of Iron(II) with 2-Thenoyltrifluoroacetone and Trioctylphosphine Oxide

Effects of a Solvent on the Extraction of Europium(III) with 4-Isopropyltropolone

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