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

Inaba, Kazuho

doi:10.1021/la960813u

Cited by 11 publications

(19 citation statements)

References 26 publications

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“…The Kd values of the five β-diketones in a similar system obtained previously using the indirect method 1,4 are also listed in Table 1. A comparison of these two series of values shows that the values for all five β-diketones obtained here are somewhat smaller than those obtained previously.…”

Section: Resultsmentioning

confidence: 92%

“…1,4,12,13 However, the procedures and the data analysis for these methods are rather complicated and may yield an error in the results. The direct determination using the absorbance of the extractant itself 9,14,15 is the simplest technique and may reflect the most "true" behavior of the extractant in the solutions.…”

Section: Resultsmentioning

confidence: 99%

“…The β-diketones are weakly mono-basic acid (values of aciddissociation constant for AA and BZA are about 10 -9 and for TFA, BFA and TTA are about 10 -6 ) 4 and can only be dissociated when the pH of the solution is high. However, the pH region of the present experiments was low enough, so that the total concentration, [HAT]t, in the whole system can be expressed as…”

Section: Data Treatmentmentioning

confidence: 99%

“…The author has already reported values for a micellar system obtained by an indirect method using the extraction equilibria of iron(III) as a probe. 4 By this method, the existence of complex species in the bulk aqueous phase was neglected, 5 and thus the values may have errors. In the present study, the partition constant for five β-diketones in the similar system was reexamined directly using their UV-visible absorption.…”

mentioning

confidence: 99%

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Spectrophotometric Determination of the Partition Constant for Five β-Diketones in Triton X-100 Micellar Systems

Inaba

2001

ANAL. SCI.

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Section: Resultsmentioning

confidence: 92%

Section: Resultsmentioning

confidence: 99%

Section: Data Treatmentmentioning

confidence: 99%

mentioning

confidence: 99%

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Spectrophotometric Determination of the Partition Constant for Five β-Diketones in Triton X-100 Micellar Systems

Inaba

2001

ANAL. SCI.

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“…It is difficult to clarify the true part of the rate-determiningstep in the physical reaction, however, the following discussions which have been presented previously by the author 14 may be important. The partition constant of the tris-complexes of iron(III) with three kinds of trifluoromethyl substituted β-diketones in the micellar system is lower than that expected from the data obtained in the conventional hexane-water and diethyl ether-water systems.…”

Section: Correction For the Rate Of Complex Formation With Htfa In Trmentioning

confidence: 98%

Unusually Slow Extraction Rate and Mechanism of Iron(III) with Trifluoroacetylacetone in Triton X-100 Micellar System. Part II. Interfacial Transport

Inaba

2000

ANAL. SCI.

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As has been demonstrated in Part I, 1 the rate of formation/extraction of iron(III) with a kind of trifluoromethylsubstituted β-diketone (HA), trifluoroacetylacetone (1,1,1-trifluoro-2,4-pentanedione; Htfa) in aqueous Triton X-100 micellar solution system is sometimes slower than that estimated from the complex formation rate in the single aqueous solution, although the formation reaction proceeds only in the bulk aqueous phase. The difference in the rates observed and estimated are found to be larger when the ligand anion concentration in the bulk aqueous phase is higher and/or the surfactant concentration is higher. In such conditions, the molar fraction of the extracted tris-complex (FeA3) to the whole complex species in the system (FeA 2+ , FeA2 + , FeA3 and FeA3m) becomes higher. The formation reaction in the present micellar system is essentially controlled only by the formation of the mono-complex in the bulk aqueous phase and the equilibria among the three complex species in the bulk aqueous phase (FeA 2+ , FeA2 + and FeA3) are established while the reaction proceeds; hence, the deceleration phenomenon is assumed to be due to a slow material transport of the extractable tris-complex from the bulk aqueous phase to the micellar pseudophase.In the present part of the series, the rate of material transport of the tris-complex from the bulk aqueous phase to the micellar pseudophase has been directly measured using a novel micellarconcentration-jump stopped-flow technique in order to learn the reason for the slow extraction of iron(III) with Htfa into Triton X-100 micellar pseudophase. ExperimentalAll the reagents, instruments and experimental conditions are similar to those used in Part I. 1 The measurements for the material transport of the tris-complex were carried out as follows. An acidic metal solution containing 2 × 10 -4 M iron(III), 4 × 10 -3 -2 × 10 -2 M Htfa and 0.2, 0.5 or 1.0% Triton X-100, and an acidic ligand solution containing 4 × 10 -3 -3 × 10 -2 M Htfa and 0.8 -9.8% of the surfactant were mixed up and the change of absorbance at 435 nm was monitored by the stoppedflow spectrophotometer. The ligand anion concentration in the bulk aqueous phase of the resulting solution was controlled similar to that in the starting metal solution to avoid changes of total concentrations of complex species in the resulting solution just after the mixing with formation/decomposition due to some changes of the ligand anion concentration. The rate constants were taken as the average of results for a minimum of 5 kinetic runs. The absorbance and the pH of the resulting solutions were also monitored after the extraction equilibria were established. Data TreatmentIn the present paper, the chemical species in the micellar pseudophase are denoted by subscript "m", those in the bulk aqueous phase by lack of subscript, and those on the basis of total volume of the micellar solution by subscript "t". The subscript "(S)" denotes the species in the starting metal solution and "(R)" denotes a species in the resulting soluti...

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Synthesis of Conjugated Polyphenylene Dendritic β‐Diketones

2006

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An efficient synthesis of high generation conjugated polyphenylene dendrimer-based β-diketones was investigated using simple synthetic methods. The new dendrimer-based β-diketones were characterized by NMR, MS and elemental analysis. The UV-Vis and fluorescence spectra of these β-diketones in different solvents were investigated. The photoluminescent (PL) quantum yield and TG and DSC curves were also investigated. A new intermediate, 1-bromo-3,5-diiodobenzene, was developed to synthesize high generation dendrimers with good yields.

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

Cited by 11 publications

References 26 publications

Spectrophotometric Determination of the Partition Constant for Five β-Diketones in Triton X-100 Micellar Systems

Spectrophotometric Determination of the Partition Constant for Five β-Diketones in Triton X-100 Micellar Systems

Unusually Slow Extraction Rate and Mechanism of Iron(III) with Trifluoroacetylacetone in Triton X-100 Micellar System. Part II. Interfacial Transport

Synthesis of Conjugated Polyphenylene Dendritic β‐Diketones

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