Solvent effect on the distribution equilibrium of 8-quinolinol derivatives between supercritical carbon dioxide and water

Ohashi, Akiyoshi; Yamato, Koji; Imura, Hisanori; Ohashi, Kousaburo

doi:10.1016/j.supflu.2009.03.009

Cited by 6 publications

(6 citation statements)

References 34 publications

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“…The structures and names of considered 8-hydroxyquinolinols are indicated in Appendix A. The dissociation constants of 8-hydoxyquinoline and its derivatives determined experimentally in aqueous and water–dioxane solutions, − collected in Tables and , have been selected as a training set in the performed LEFR analysis. Dissociation constants of 8-hydroxyquinolinols ,,− from Table have been applied as a test set.…”

Section: Introductionmentioning

confidence: 99%

Linear Free Energy Relationship (LFER) Analysis of Dissociation Constants of 8-Hydroxyquinoline and Its Derivatives in Aqueous and Dioxane–Water Solutions

et al. 2013

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The linear free energy relationship (LFER) analysis based on the Hammett equation has been applied for dissociation processes of 8-hydroxyquinoline and its derivatives in aqueous and 1,4-dioxane-water solutions. The effects of temperature, composition, and ionic strength of the solutions have been discussed. The derived semiempirical correlations are of high statistical quality and of good predictive power which permit the reliable evaluation of dissociation constants 8-hydroxyquinoline and its derivatives under specified experimental conditions: (i) temperature from (289 to 333) K, (ii) mol fraction of 1,4-dioxane ranging from (0 to 0.380), and (iii) ionic strength of solution changing from 0 to 5 mol·dm–3.

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Section: Introductionmentioning

confidence: 99%

Linear Free Energy Relationship (LFER) Analysis of Dissociation Constants of 8-Hydroxyquinoline and Its Derivatives in Aqueous and Dioxane–Water Solutions

et al. 2013

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“…The structures and names of considered 8-quinolinols are indicated in Appendix A. The distribution constants of 8-hydroxyquinoline and its derivatives determined experimentally in organic solvent/water and/or organic solvent/aqueous solution systems ,− are collected in Tables and .…”

Section: Introductionmentioning

confidence: 99%

Linear Solvation Energy Relationship (LSER) Analysis of Liquid–Liquid Distribution Constants of 8-Hydroxyquinoline and Its Derivatives

2011

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The linear solvation energy relationship (LSER) analysis of liquidÀliquid distribution constants of 8-hydroxyquinoline and its derivatives has been performed in terms of hydrophobicity of solutes, property parameters of diluents in the organic phase, and ionic strength of the aqueous phase. The effect of temperature has been also discussed. The obtained correlations permit the evaluation of unknown values of distribution constants of 8-hydroxyquinoline and/or its derivatives in the given extraction system. The set of available systematic experimental data reflects only the effect of temperature on the distribution of 8-hydroxyquinoline and its 2-methyl derivative; however, the distribution constants of the other 8-hydroxyquinolinols were determined sporadically at the different ionic strengths of the aqueous phase and lower or higher temperatures than 298 K. The correlation describing the effect of temperature can be used for the raw estimation of unknown values of distribution constants of 8-hydroxyquinoline and/or its derivatives in the given extraction system within the temperature range from (20 to 50) °C.

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“…The KD,CO 2 values at 13 MPa were estimated from the dependency of KD,CO 2 on the CO2 density, given in a previous report. 19 Synergism was observed among all the HQs. The synergistic effect increased in the following order: Hq < HO2q < HFO2q < 5-Cl-Hq ≈ HO6q.…”

Section: Synergism Of 8-quinolinol Derivativesmentioning

confidence: 91%

“…The pH of the aqueous solution was maintained at 1.7. The obtained %E values are summarized in Table 1, which also lists the acid dissociation constant of H2Q + , Ka1, 19 and the distribution constant of HQ, KD,CO 2 , between SC-CO2 at 13 MPa and water. The KD,CO 2 values at 13 MPa were estimated from the dependency of KD,CO 2 on the CO2 density, given in a previous report.…”

Section: Synergism Of 8-quinolinol Derivativesmentioning

confidence: 99%

Synergistic Extraction Equilibrium of Gallium(III) with Di(2-ethylhexyl)phosphoric Acid and 8-Quinolinol Derivatives into Supercritical Carbon Dioxide

et al. 2013

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Solvent effect on the distribution equilibrium of 8-quinolinol derivatives between supercritical carbon dioxide and water

Cited by 6 publications

References 34 publications

Linear Free Energy Relationship (LFER) Analysis of Dissociation Constants of 8-Hydroxyquinoline and Its Derivatives in Aqueous and Dioxane–Water Solutions

Linear Free Energy Relationship (LFER) Analysis of Dissociation Constants of 8-Hydroxyquinoline and Its Derivatives in Aqueous and Dioxane–Water Solutions

Linear Solvation Energy Relationship (LSER) Analysis of Liquid–Liquid Distribution Constants of 8-Hydroxyquinoline and Its Derivatives

Synergistic Extraction Equilibrium of Gallium(III) with Di(2-ethylhexyl)phosphoric Acid and 8-Quinolinol Derivatives into Supercritical Carbon Dioxide

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