Evaluation of the Hydrophilic Properties of Crown Ether-ion-pair Complexes with Alkali Metal Picrates by Their Distribution into Less-polar Diluents

Kudo, Yoshihisa; Katsuta, Shoichi; Takeda, Yasuyuki

doi:10.2116/analsci.25.563

Cited by 2 publications

(3 citation statements)

References 15 publications

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“…Compared to the same carbon numbers, the order of melting points is alcohol > ketone > ester ∼ hydrocarbon > ether, and that of flash points is alcohol > ketone ∼ ester > hydrocarbon ∼ ether. The melting points under 10 o C and flash points over 70 o C are preferable for the use of diluent, therefore, the ranges to use for carbon numbers in diluents are alcohol (8)(9)(10)(11)(12), ketone (9-12), ester (9-12), hydrocarbon (> 10), and ether (> 12). Information is available to show which structure is a useful diluent.…”

Section: Basic Properties Of Diluentsmentioning

confidence: 99%

“…Liquid-liquid extraction methods are also useful for Cs recovery. In this case, crown ether compounds and calix-crown compounds for Cs and Sr extraction are promising [11][12][13][14][15]. The normal crown compounds are generally water-miscible; dibenzo-18crown6 and di-t-butyl-dibenzo-18crown6 are available for Cs extraction because of their lipophilicity and dicyclohexyl-18crown6 and di-t-butyl-dicyclohexyl-18crown6 (DtBuDCH18C6) are also useful for Sr extraction [14,15].…”

Section: Introductionmentioning

confidence: 99%

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Solvent Extraction of Cesium Using DtBuDB18C6 into Various Organic Solvents

Sasaki

Morita

Kitatsuji

et al. 2021

SERDJ

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High concentration of Cs is present in high-level radioactive waste. It is well-known that Cs is an alkali element and difficult to extract completely into an organic phase. Crown ether compounds are widely available for Cs extractants; DtBuDB18C6 (di-t-butyl-dibenzo-18crown6), was used in this study. Organic solvents used for the industrial applications, such as n-dodecane and 1-octanol, have low solubility concerning the compound; other solvents were employed and tested. In this study, ketone-, ether-, and estertype solvents showed high solubility for DtBuDB18C6 and DtBuDB18C6, when dissolved in ketones and alcohols, exhibited relatively high Cs distribution ratios (D(Cs)), closely to 10.

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Section: Basic Properties Of Diluentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Solvent Extraction of Cesium Using DtBuDB18C6 into Various Organic Solvents

Sasaki

Morita

Kitatsuji

et al. 2021

SERDJ

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“…11 The hydrophobic character of DPA -has been investigated in the ion-pair extraction of DPA -with alkali metal-crown ether complexes. 12,13 The extraction or precipitation characteristics of an alkali metal ion was improved as a crown ether complex, and K + was indirectly determined with DPA -by spectrophotometric flow injection analysis, 14 in which dicyclohexyl-18-crown-6 ether (DC18C6) was used as a complexing reagent for K + and the dissolved concentration of DPA -was decreased by the precipitation formed between K + @DC18C6 and DPA -. 14 Recently, the specific precipitation property of DPA -with K + and Cs + has been investigated by Eringathodi et al 15 based on a crystallographic study of the precipitates.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Ion-association Equilibrium of Precipitable Dipicrylaminate Ion in Aqueous Solution by Capillary Zone Electrophoresis

2014

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The ion-association equilibrium of the dipicrylaminate ion (DPA -) was investigated in an aqueous solution with alkali metal ions and with its 18-crown-6 ether complexes as pairing cations by capillary zone electrophoresis (CZE). Although DPA -is precipitable with the pairing cations of K + and Cs + in a homogenous aqueous solution, a low concentration of DPA -below its solubility suppressed the formation of the precipitates, and DPA -was detected as a usual CZE signal. Changes in the electrophoretic mobility of DPA -was analyzed for its ion-association equilibrium. The ion association constants determined were almost comparable among alkali metal ions, while the ion association constants were meaningfully large with a hydrophobic 18-crown-6 ether complex of K + . The CZE separation was also proved to be useful for the equilibrium analysis under precipitating conditions. It was suggested that the precipitable property of DPA -with K + and Cs + could not be attributed to the ion-association process in an aqueous solution, but to the condensation process concerning the intermolecular CH···O bond in the precipitate crystals, as reported.Keywords Dipicrylaminate ion, alkali metal ions, 18-crown-6 ether complexes, ion-association equilibrium, aqueous solution, capillary zone electrophoresis

show abstract

Evaluation of the Hydrophilic Properties of Crown Ether-ion-pair Complexes with Alkali Metal Picrates by Their Distribution into Less-polar Diluents

Cited by 2 publications

References 15 publications

Solvent Extraction of Cesium Using DtBuDB18C6 into Various Organic Solvents

Solvent Extraction of Cesium Using DtBuDB18C6 into Various Organic Solvents

Analysis of Ion-association Equilibrium of Precipitable Dipicrylaminate Ion in Aqueous Solution by Capillary Zone Electrophoresis

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